diff --git a/lib/analyze-action.js b/lib/analyze-action.js
index 77af178a8..737d2c694 100644
--- a/lib/analyze-action.js
+++ b/lib/analyze-action.js
@@ -29,43 +29,44 @@ async function sendStatusReport(startedAt, queriesStats, uploadStats, error) {
     };
     await util.sendStatusReport(statusReport);
 }
-async function createdDBForScannedLanguages(databaseFolder, config) {
+async function createdDBForScannedLanguages(config) {
     const codeql = codeql_1.getCodeQL(config.codeQLCmd);
     for (const language of config.languages) {
         if (languages_1.isScannedLanguage(language)) {
             core.startGroup('Extracting ' + language);
-            await codeql.extractScannedLanguage(path.join(databaseFolder, language), language);
+            await codeql.extractScannedLanguage(util.getCodeQLDatabasePath(config.tempDir, language), language);
             core.endGroup();
         }
     }
 }
-async function finalizeDatabaseCreation(databaseFolder, config) {
-    await createdDBForScannedLanguages(databaseFolder, config);
+async function finalizeDatabaseCreation(config) {
+    await createdDBForScannedLanguages(config);
     const codeql = codeql_1.getCodeQL(config.codeQLCmd);
     for (const language of config.languages) {
         core.startGroup('Finalizing ' + language);
-        await codeql.finalizeDatabase(path.join(databaseFolder, language));
+        await codeql.finalizeDatabase(util.getCodeQLDatabasePath(config.tempDir, language));
         core.endGroup();
     }
 }
 // Runs queries and creates sarif files in the given folder
-async function runQueries(databaseFolder, sarifFolder, config) {
+async function runQueries(sarifFolder, config) {
     const codeql = codeql_1.getCodeQL(config.codeQLCmd);
-    for (let language of fs.readdirSync(databaseFolder)) {
+    for (let language of config.languages) {
         core.startGroup('Analyzing ' + language);
         const queries = config.queries[language] || [];
         if (queries.length === 0) {
             throw new Error('Unable to analyse ' + language + ' as no queries were selected for this language');
         }
         try {
+            const databasePath = util.getCodeQLDatabasePath(config.tempDir, language);
             // Pass the queries to codeql using a file instead of using the command
             // line to avoid command line length restrictions, particularly on windows.
-            const querySuite = path.join(databaseFolder, language + '-queries.qls');
+            const querySuite = databasePath + '-queries.qls';
             const querySuiteContents = queries.map(q => '- query: ' + q).join('\n');
             fs.writeFileSync(querySuite, querySuiteContents);
             core.debug('Query suite file for ' + language + '...\n' + querySuiteContents);
             const sarifFile = path.join(sarifFolder, language + '.sarif');
-            await codeql.databaseAnalyze(path.join(databaseFolder, language), sarifFile, querySuite);
+            await codeql.databaseAnalyze(databasePath, sarifFile, querySuite);
             core.debug('SARIF results for database ' + language + ' created at "' + sarifFile + '"');
             core.endGroup();
         }
@@ -90,13 +91,12 @@ async function run() {
         const config = await configUtils.getConfig(util.getRequiredEnvParam('RUNNER_TEMP'));
         core.exportVariable(sharedEnv.ODASA_TRACER_CONFIGURATION, '');
         delete process.env[sharedEnv.ODASA_TRACER_CONFIGURATION];
-        const databaseFolder = util.getCodeQLDatabasesDir(config.tempDir);
         const sarifFolder = core.getInput('output');
         fs.mkdirSync(sarifFolder, { recursive: true });
         core.info('Finalizing database creation');
-        await finalizeDatabaseCreation(databaseFolder, config);
+        await finalizeDatabaseCreation(config);
         core.info('Analyzing database');
-        queriesStats = await runQueries(databaseFolder, sarifFolder, config);
+        queriesStats = await runQueries(sarifFolder, config);
         if ('true' === core.getInput('upload')) {
             uploadStats = await upload_lib.upload(sarifFolder, repository_1.parseRepositoryNwo(util.getRequiredEnvParam('GITHUB_REPOSITORY')), await util.getCommitOid(), util.getRef(), await util.getAnalysisKey(), util.getRequiredEnvParam('GITHUB_WORKFLOW'), util.getWorkflowRunID(), core.getInput('checkout_path'), core.getInput('matrix'), core.getInput('token'), util.getRequiredEnvParam('GITHUB_API_URL'), 'actions', logging_1.getActionsLogger());
         }
diff --git a/lib/analyze-action.js.map b/lib/analyze-action.js.map
index 5bca8ee09..758b217b3 100644
--- a/lib/analyze-action.js.map
+++ b/lib/analyze-action.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"analyze-action.js","sourceRoot":"","sources":["../src/analyze-action.ts"],"names":[],"mappings":";;;;;;;;;AAAA,oDAAsC;AACtC,uCAAyB;AACzB,2CAA6B;AAE7B,qCAAqC;AACrC,4DAA8C;AAC9C,2CAAgD;AAChD,uCAA6C;AAC7C,6CAAkD;AAClD,gEAAkD;AAClD,yDAA2C;AAC3C,6CAA+B;AAiC/B,KAAK,UAAU,gBAAgB,CAC7B,SAAe,EACf,YAA6C,EAC7C,WAAsD,EACtD,KAAa;;IAEb,MAAM,MAAM,GAAG,OAAA,YAAY,0CAAE,wBAAwB,MAAK,SAAS,IAAI,KAAK,KAAK,SAAS,CAAC,CAAC,CAAC,SAAS,CAAC,CAAC,CAAC,SAAS,CAAC;IACnH,MAAM,gBAAgB,GAAG,MAAM,IAAI,CAAC,sBAAsB,CAAC,QAAQ,EAAE,MAAM,EAAE,SAAS,QAAE,KAAK,0CAAE,OAAO,QAAE,KAAK,0CAAE,KAAK,CAAC,CAAC;IACtH,MAAM,YAAY,GAAuB;QACvC,GAAG,gBAAgB;QACnB,GAAG,CAAC,YAAY,IAAI,EAAE,CAAC;QACvB,GAAG,CAAC,WAAW,IAAI,EAAE,CAAC;KACvB,CAAC;IACF,MAAM,IAAI,CAAC,gBAAgB,CAAC,YAAY,CAAC,CAAC;AAC5C,CAAC;AAED,KAAK,UAAU,4BAA4B,CAAC,MAA0B;IACpE,MAAM,MAAM,GAAG,kBAAS,CAAC,MAAM,CAAC,SAAS,CAAC,CAAC;IAC3C,KAAK,MAAM,QAAQ,IAAI,MAAM,CAAC,SAAS,EAAE;QACvC,IAAI,6BAAiB,CAAC,QAAQ,CAAC,EAAE;YAC/B,IAAI,CAAC,UAAU,CAAC,aAAa,GAAG,QAAQ,CAAC,CAAC;YAC1C,MAAM,MAAM,CAAC,sBAAsB,CAAC,IAAI,CAAC,qBAAqB,CAAC,MAAM,CAAC,OAAO,EAAE,QAAQ,CAAC,EAAE,QAAQ,CAAC,CAAC;YACpG,IAAI,CAAC,QAAQ,EAAE,CAAC;SACjB;KACF;AACH,CAAC;AAED,KAAK,UAAU,wBAAwB,CAAC,MAA0B;IAChE,MAAM,4BAA4B,CAAC,MAAM,CAAC,CAAC;IAE3C,MAAM,MAAM,GAAG,kBAAS,CAAC,MAAM,CAAC,SAAS,CAAC,CAAC;IAC3C,KAAK,MAAM,QAAQ,IAAI,MAAM,CAAC,SAAS,EAAE;QACvC,IAAI,CAAC,UAAU,CAAC,aAAa,GAAG,QAAQ,CAAC,CAAC;QAC1C,MAAM,MAAM,CAAC,gBAAgB,CAAC,IAAI,CAAC,qBAAqB,CAAC,MAAM,CAAC,OAAO,EAAE,QAAQ,CAAC,CAAC,CAAC;QACpF,IAAI,CAAC,QAAQ,EAAE,CAAC;KACjB;AACH,CAAC;AAED,2DAA2D;AAC3D,KAAK,UAAU,UAAU,CACvB,WAAmB,EACnB,MAA0B;IAE1B,MAAM,MAAM,GAAG,kBAAS,CAAC,MAAM,CAAC,SAAS,CAAC,CAAC;IAC3C,KAAK,IAAI,QAAQ,IAAI,MAAM,CAAC,SAAS,EAAE;QACrC,IAAI,CAAC,UAAU,CAAC,YAAY,GAAG,QAAQ,CAAC,CAAC;QAEzC,MAAM,OAAO,GAAG,MAAM,CAAC,OAAO,CAAC,QAAQ,CAAC,IAAI,EAAE,CAAC;QAC/C,IAAI,OAAO,CAAC,MAAM,KAAK,CAAC,EAAE;YACxB,MAAM,IAAI,KAAK,CAAC,oBAAoB,GAAG,QAAQ,GAAG,gDAAgD,CAAC,CAAC;SACrG;QAED,IAAI;YACF,MAAM,YAAY,GAAG,IAAI,CAAC,qBAAqB,CAAC,MAAM,CAAC,OAAO,EAAE,QAAQ,CAAC,CAAC;YAC1E,uEAAuE;YACvE,2EAA2E;YAC3E,MAAM,UAAU,GAAG,YAAY,GAAG,cAAc,CAAC;YACjD,MAAM,kBAAkB,GAAG,OAAO,CAAC,GAAG,CAAC,CAAC,CAAC,EAAE,CAAC,WAAW,GAAG,CAAC,CAAC,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC;YACxE,EAAE,CAAC,aAAa,CAAC,UAAU,EAAE,kBAAkB,CAAC,CAAC;YACjD,IAAI,CAAC,KAAK,CAAC,uBAAuB,GAAG,QAAQ,GAAG,OAAO,GAAG,kBAAkB,CAAC,CAAC;YAE9E,MAAM,SAAS,GAAG,IAAI,CAAC,IAAI,CAAC,WAAW,EAAE,QAAQ,GAAG,QAAQ,CAAC,CAAC;YAE9D,MAAM,MAAM,CAAC,eAAe,CAAC,YAAY,EAAE,SAAS,EAAE,UAAU,CAAC,CAAC;YAElE,IAAI,CAAC,KAAK,CAAC,6BAA6B,GAAG,QAAQ,GAAG,eAAe,GAAG,SAAS,GAAG,GAAG,CAAC,CAAC;YACzF,IAAI,CAAC,QAAQ,EAAE,CAAC;SAEjB;QAAC,OAAO,CAAC,EAAE;YACV,+DAA+D;YAC/D,OAAO;gBACL,wBAAwB,EAAE,QAAQ;aACnC,CAAC;SACH;KACF;IAED,OAAO,EAAE,CAAC;AACZ,CAAC;AAED,KAAK,UAAU,GAAG;IAChB,MAAM,SAAS,GAAG,IAAI,IAAI,EAAE,CAAC;IAC7B,IAAI,YAAY,GAAoC,SAAS,CAAC;IAC9D,IAAI,WAAW,GAA8C,SAAS,CAAC;IACvE,IAAI;QACF,IAAI,CAAC,0BAA0B,EAAE,CAAC;QAClC,IAAI,CAAC,MAAM,IAAI,CAAC,gBAAgB,CAAC,MAAM,IAAI,CAAC,sBAAsB,CAAC,QAAQ,EAAE,UAAU,EAAE,SAAS,CAAC,EAAE,IAAI,CAAC,EAAE;YAC1G,OAAO;SACR;QACD,MAAM,MAAM,GAAG,MAAM,WAAW,CAAC,SAAS,CAAC,IAAI,CAAC,mBAAmB,CAAC,aAAa,CAAC,CAAC,CAAC;QAEpF,IAAI,CAAC,cAAc,CAAC,SAAS,CAAC,0BAA0B,EAAE,EAAE,CAAC,CAAC;QAC9D,OAAO,OAAO,CAAC,GAAG,CAAC,SAAS,CAAC,0BAA0B,CAAC,CAAC;QAEzD,MAAM,WAAW,GAAG,IAAI,CAAC,QAAQ,CAAC,QAAQ,CAAC,CAAC;QAC5C,EAAE,CAAC,SAAS,CAAC,WAAW,EAAE,EAAE,SAAS,EAAE,IAAI,EAAE,CAAC,CAAC;QAE/C,IAAI,CAAC,IAAI,CAAC,8BAA8B,CAAC,CAAC;QAC1C,MAAM,wBAAwB,CAAC,MAAM,CAAC,CAAC;QAEvC,IAAI,CAAC,IAAI,CAAC,oBAAoB,CAAC,CAAC;QAChC,YAAY,GAAG,MAAM,UAAU,CAAC,WAAW,EAAE,MAAM,CAAC,CAAC;QAErD,IAAI,MAAM,KAAK,IAAI,CAAC,QAAQ,CAAC,QAAQ,CAAC,EAAE;YACtC,WAAW,GAAG,MAAM,UAAU,CAAC,MAAM,CACnC,WAAW,EACX,+BAAkB,CAAC,IAAI,CAAC,mBAAmB,CAAC,mBAAmB,CAAC,CAAC,EACjE,MAAM,IAAI,CAAC,YAAY,EAAE,EACzB,IAAI,CAAC,MAAM,EAAE,EACb,MAAM,IAAI,CAAC,cAAc,EAAE,EAC3B,IAAI,CAAC,mBAAmB,CAAC,iBAAiB,CAAC,EAC3C,IAAI,CAAC,gBAAgB,EAAE,EACvB,IAAI,CAAC,QAAQ,CAAC,eAAe,CAAC,EAC9B,IAAI,CAAC,QAAQ,CAAC,QAAQ,CAAC,EACvB,IAAI,CAAC,QAAQ,CAAC,OAAO,CAAC,EACtB,IAAI,CAAC,mBAAmB,CAAC,gBAAgB,CAAC,EAC1C,SAAS,EACT,0BAAgB,EAAE,CAAC,CAAC;SACvB;KAEF;IAAC,OAAO,KAAK,EAAE;QACd,IAAI,CAAC,SAAS,CAAC,KAAK,CAAC,OAAO,CAAC,CAAC;QAC9B,OAAO,CAAC,GAAG,CAAC,KAAK,CAAC,CAAC;QACnB,MAAM,gBAAgB,CAAC,SAAS,EAAE,YAAY,EAAE,WAAW,EAAE,KAAK,CAAC,CAAC;QACpE,OAAO;KACR;IAED,MAAM,gBAAgB,CAAC,SAAS,EAAE,YAAY,EAAE,WAAW,CAAC,CAAC;AAC/D,CAAC;AAED,GAAG,EAAE,CAAC,KAAK,CAAC,CAAC,CAAC,EAAE;IACd,IAAI,CAAC,SAAS,CAAC,yBAAyB,GAAG,CAAC,CAAC,CAAC;IAC9C,OAAO,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC;AACjB,CAAC,CAAC,CAAC"}
\ No newline at end of file
diff --git a/lib/codeql.js b/lib/codeql.js
index 3c7cf10c8..a7650110f 100644
--- a/lib/codeql.js
+++ b/lib/codeql.js
@@ -231,14 +231,12 @@ function getCodeQLForCmd(cmd) {
                 '--format=json'
             ]);
         },
-        getTracerEnv: async function (databasePath, compilerSpec) {
+        getTracerEnv: async function (databasePath) {
             let envFile = path.resolve(databasePath, 'working', 'env.tmp');
-            const compilerSpecArg = compilerSpec ? ["--compiler-spec=" + compilerSpec] : [];
             await exec.exec(cmd, [
                 'database',
                 'trace-command',
                 databasePath,
-                ...compilerSpecArg,
                 ...getExtraOptionsFromEnv(['database', 'trace-command']),
                 process.execPath,
                 path.resolve(__dirname, 'tracer-env.js'),
diff --git a/lib/codeql.js.map b/lib/codeql.js.map
index 9856e6957..6780b4f2a 100644
--- a/lib/codeql.js.map
+++ b/lib/codeql.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/lib/init-action.js b/lib/init-action.js
index 310f62e90..8cc880d4a 100644
--- a/lib/init-action.js
+++ b/lib/init-action.js
@@ -14,111 +14,8 @@ const path = __importStar(require("path"));
 const analysisPaths = __importStar(require("./analysis-paths"));
 const codeql_1 = require("./codeql");
 const configUtils = __importStar(require("./config-utils"));
-const languages_1 = require("./languages");
+const tracer_config_1 = require("./tracer-config");
 const util = __importStar(require("./util"));
-const CRITICAL_TRACER_VARS = new Set(['SEMMLE_PRELOAD_libtrace',
-    ,
-    'SEMMLE_RUNNER',
-    ,
-    'SEMMLE_COPY_EXECUTABLES_ROOT',
-    ,
-    'SEMMLE_DEPTRACE_SOCKET',
-    ,
-    'SEMMLE_JAVA_TOOL_OPTIONS'
-]);
-async function tracerConfig(codeql, database, compilerSpec) {
-    const env = await codeql.getTracerEnv(database, compilerSpec);
-    const config = env['ODASA_TRACER_CONFIGURATION'];
-    const info = { spec: config, env: {} };
-    // Extract critical tracer variables from the environment
-    for (let entry of Object.entries(env)) {
-        const key = entry[0];
-        const value = entry[1];
-        // skip ODASA_TRACER_CONFIGURATION as it is handled separately
-        if (key === 'ODASA_TRACER_CONFIGURATION') {
-            continue;
-        }
-        // skip undefined values
-        if (typeof value === 'undefined') {
-            continue;
-        }
-        // Keep variables that do not exist in current environment. In addition always keep
-        // critical and CODEQL_ variables
-        if (typeof process.env[key] === 'undefined' || CRITICAL_TRACER_VARS.has(key) || key.startsWith('CODEQL_')) {
-            info.env[key] = value;
-        }
-    }
-    return info;
-}
-function concatTracerConfigs(tracerConfigs, config) {
-    // A tracer config is a map containing additional environment variables and a tracer 'spec' file.
-    // A tracer 'spec' file has the following format [log_file, number_of_blocks, blocks_text]
-    // Merge the environments
-    const env = {};
-    let copyExecutables = false;
-    let envSize = 0;
-    for (const v of tracerConfigs) {
-        for (let e of Object.entries(v.env)) {
-            const name = e[0];
-            const value = e[1];
-            // skip SEMMLE_COPY_EXECUTABLES_ROOT as it is handled separately
-            if (name === 'SEMMLE_COPY_EXECUTABLES_ROOT') {
-                copyExecutables = true;
-            }
-            else if (name in env) {
-                if (env[name] !== value) {
-                    throw Error('Incompatible values in environment parameter ' +
-                        name + ': ' + env[name] + ' and ' + value);
-                }
-            }
-            else {
-                env[name] = value;
-                envSize += 1;
-            }
-        }
-    }
-    // Concatenate spec files into a new spec file
-    let languages = Object.keys(tracerConfigs);
-    const cppIndex = languages.indexOf('cpp');
-    // Make sure cpp is the last language, if it's present since it must be concatenated last
-    if (cppIndex !== -1) {
-        let lastLang = languages[languages.length - 1];
-        languages[languages.length - 1] = languages[cppIndex];
-        languages[cppIndex] = lastLang;
-    }
-    let totalLines = [];
-    let totalCount = 0;
-    for (let lang of languages) {
-        const lines = fs.readFileSync(tracerConfigs[lang].spec, 'utf8').split(/\r?\n/);
-        const count = parseInt(lines[1], 10);
-        totalCount += count;
-        totalLines.push(...lines.slice(2));
-    }
-    const newLogFilePath = path.resolve(config.tempDir, 'compound-build-tracer.log');
-    const spec = path.resolve(config.tempDir, 'compound-spec');
-    const compoundTempFolder = path.resolve(config.tempDir, 'compound-temp');
-    const newSpecContent = [newLogFilePath, totalCount.toString(10), ...totalLines];
-    if (copyExecutables) {
-        env['SEMMLE_COPY_EXECUTABLES_ROOT'] = compoundTempFolder;
-        envSize += 1;
-    }
-    fs.writeFileSync(spec, newSpecContent.join('\n'));
-    // Prepare the content of the compound environment file
-    let buffer = Buffer.alloc(4);
-    buffer.writeInt32LE(envSize, 0);
-    for (let e of Object.entries(env)) {
-        const key = e[0];
-        const value = e[1];
-        const lineBuffer = new Buffer(key + '=' + value + '\0', 'utf8');
-        const sizeBuffer = Buffer.alloc(4);
-        sizeBuffer.writeInt32LE(lineBuffer.length, 0);
-        buffer = Buffer.concat([buffer, sizeBuffer, lineBuffer]);
-    }
-    // Write the compound environment
-    const envPath = spec + '.environment';
-    fs.writeFileSync(envPath, buffer);
-    return { env, spec };
-}
 async function sendSuccessStatusReport(startedAt, config) {
     const statusReportBase = await util.createStatusReportBase('init', 'success', startedAt);
     const languages = config.languages.join(',');
@@ -173,41 +70,22 @@ async function run() {
         // Setup CODEQL_RAM flag (todo improve this https://github.com/github/dsp-code-scanning/issues/935)
         const codeqlRam = process.env['CODEQL_RAM'] || '6500';
         core.exportVariable('CODEQL_RAM', codeqlRam);
-        const databaseFolder = util.getCodeQLDatabasesDir(config.tempDir);
-        fs.mkdirSync(databaseFolder, { recursive: true });
-        let tracedLanguageConfigs = [];
+        fs.mkdirSync(util.getCodeQLDatabasesDir(config.tempDir), { recursive: true });
         // TODO: replace this code once CodeQL supports multi-language tracing
         for (let language of config.languages) {
-            const languageDatabase = path.join(databaseFolder, language);
             // Init language database
-            await codeql.databaseInit(languageDatabase, language, sourceRoot);
-            // TODO: add better detection of 'traced languages' instead of using a hard coded list
-            if (languages_1.isTracedLanguage(language)) {
-                const config = await tracerConfig(codeql, languageDatabase);
-                tracedLanguageConfigs.push(config);
-            }
+            await codeql.databaseInit(util.getCodeQLDatabasePath(config.tempDir, language), language, sourceRoot);
         }
-        if (tracedLanguageConfigs.length > 0) {
-            const mainTracerConfig = concatTracerConfigs(tracedLanguageConfigs, config);
-            if (mainTracerConfig.spec) {
-                for (let entry of Object.entries(mainTracerConfig.env)) {
-                    core.exportVariable(entry[0], entry[1]);
-                }
-                core.exportVariable('ODASA_TRACER_CONFIGURATION', mainTracerConfig.spec);
-                const codeQLDir = path.dirname(codeql.getPath());
-                if (process.platform === 'darwin') {
-                    core.exportVariable('DYLD_INSERT_LIBRARIES', path.join(codeQLDir, 'tools', 'osx64', 'libtrace.dylib'));
-                }
-                else if (process.platform === 'win32') {
-                    await exec.exec('powershell', [
-                        path.resolve(__dirname, '..', 'src', 'inject-tracer.ps1'),
-                        path.resolve(codeQLDir, 'tools', 'win64', 'tracer.exe'),
-                    ], { env: { 'ODASA_TRACER_CONFIGURATION': mainTracerConfig.spec } });
-                }
-                else {
-                    core.exportVariable('LD_PRELOAD', path.join(codeQLDir, 'tools', 'linux64', '${LIB}trace.so'));
-                }
+        const tracerConfig = await tracer_config_1.getCombinedTracerConfig(config, codeql);
+        if (tracerConfig !== undefined) {
+            if (process.platform === 'win32') {
+                await exec.exec('powershell', [
+                    path.resolve(__dirname, '..', 'src', 'inject-tracer.ps1'),
+                    path.resolve(path.dirname(codeql.getPath()), 'tools', 'win64', 'tracer.exe'),
+                ], { env: { 'ODASA_TRACER_CONFIGURATION': tracerConfig.spec } });
             }
+            // NB: in CLI mode these will be output to a file rather than exported with core.exportVariable
+            Object.entries(tracerConfig.env).forEach(([key, value]) => core.exportVariable(key, value));
         }
     }
     catch (error) {
diff --git a/lib/init-action.js.map b/lib/init-action.js.map
index 5db41fed1..8e186a9fb 100644
--- a/lib/init-action.js.map
+++ b/lib/init-action.js.map
@@ -1 +1 @@
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\ No newline at end of file
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diff --git a/lib/tracer-config.js b/lib/tracer-config.js
new file mode 100644
index 000000000..22c439a78
--- /dev/null
+++ b/lib/tracer-config.js
@@ -0,0 +1,143 @@
+"use strict";
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const fs = __importStar(require("fs"));
+const path = __importStar(require("path"));
+const languages_1 = require("./languages");
+const util = __importStar(require("./util"));
+const CRITICAL_TRACER_VARS = new Set(['SEMMLE_PRELOAD_libtrace',
+    ,
+    'SEMMLE_RUNNER',
+    ,
+    'SEMMLE_COPY_EXECUTABLES_ROOT',
+    ,
+    'SEMMLE_DEPTRACE_SOCKET',
+    ,
+    'SEMMLE_JAVA_TOOL_OPTIONS'
+]);
+async function getTracerConfigForLanguage(codeql, config, language) {
+    const env = await codeql.getTracerEnv(util.getCodeQLDatabasePath(config.tempDir, language));
+    const spec = env['ODASA_TRACER_CONFIGURATION'];
+    const info = { spec, env: {} };
+    // Extract critical tracer variables from the environment
+    for (let entry of Object.entries(env)) {
+        const key = entry[0];
+        const value = entry[1];
+        // skip ODASA_TRACER_CONFIGURATION as it is handled separately
+        if (key === 'ODASA_TRACER_CONFIGURATION') {
+            continue;
+        }
+        // skip undefined values
+        if (typeof value === 'undefined') {
+            continue;
+        }
+        // Keep variables that do not exist in current environment. In addition always keep
+        // critical and CODEQL_ variables
+        if (typeof process.env[key] === 'undefined' || CRITICAL_TRACER_VARS.has(key) || key.startsWith('CODEQL_')) {
+            info.env[key] = value;
+        }
+    }
+    return info;
+}
+exports.getTracerConfigForLanguage = getTracerConfigForLanguage;
+function concatTracerConfigs(tracerConfigs, config) {
+    // A tracer config is a map containing additional environment variables and a tracer 'spec' file.
+    // A tracer 'spec' file has the following format [log_file, number_of_blocks, blocks_text]
+    // Merge the environments
+    const env = {};
+    let copyExecutables = false;
+    let envSize = 0;
+    for (const v of Object.values(tracerConfigs)) {
+        for (let e of Object.entries(v.env)) {
+            const name = e[0];
+            const value = e[1];
+            // skip SEMMLE_COPY_EXECUTABLES_ROOT as it is handled separately
+            if (name === 'SEMMLE_COPY_EXECUTABLES_ROOT') {
+                copyExecutables = true;
+            }
+            else if (name in env) {
+                if (env[name] !== value) {
+                    throw Error('Incompatible values in environment parameter ' +
+                        name + ': ' + env[name] + ' and ' + value);
+                }
+            }
+            else {
+                env[name] = value;
+                envSize += 1;
+            }
+        }
+    }
+    // Concatenate spec files into a new spec file
+    let languages = Object.keys(tracerConfigs);
+    const cppIndex = languages.indexOf('cpp');
+    // Make sure cpp is the last language, if it's present since it must be concatenated last
+    if (cppIndex !== -1) {
+        let lastLang = languages[languages.length - 1];
+        languages[languages.length - 1] = languages[cppIndex];
+        languages[cppIndex] = lastLang;
+    }
+    let totalLines = [];
+    let totalCount = 0;
+    for (let lang of languages) {
+        const lines = fs.readFileSync(tracerConfigs[lang].spec, 'utf8').split(/\r?\n/);
+        const count = parseInt(lines[1], 10);
+        totalCount += count;
+        totalLines.push(...lines.slice(2));
+    }
+    const newLogFilePath = path.resolve(config.tempDir, 'compound-build-tracer.log');
+    const spec = path.resolve(config.tempDir, 'compound-spec');
+    const compoundTempFolder = path.resolve(config.tempDir, 'compound-temp');
+    const newSpecContent = [newLogFilePath, totalCount.toString(10), ...totalLines];
+    if (copyExecutables) {
+        env['SEMMLE_COPY_EXECUTABLES_ROOT'] = compoundTempFolder;
+        envSize += 1;
+    }
+    fs.writeFileSync(spec, newSpecContent.join('\n'));
+    // Prepare the content of the compound environment file
+    let buffer = Buffer.alloc(4);
+    buffer.writeInt32LE(envSize, 0);
+    for (let e of Object.entries(env)) {
+        const key = e[0];
+        const value = e[1];
+        const lineBuffer = new Buffer(key + '=' + value + '\0', 'utf8');
+        const sizeBuffer = Buffer.alloc(4);
+        sizeBuffer.writeInt32LE(lineBuffer.length, 0);
+        buffer = Buffer.concat([buffer, sizeBuffer, lineBuffer]);
+    }
+    // Write the compound environment
+    const envPath = spec + '.environment';
+    fs.writeFileSync(envPath, buffer);
+    return { env, spec };
+}
+exports.concatTracerConfigs = concatTracerConfigs;
+async function getCombinedTracerConfig(config, codeql) {
+    // Abort if there are no traced languages as there's nothing to do
+    const tracedLanguages = config.languages.filter(languages_1.isTracedLanguage);
+    if (tracedLanguages.length === 0) {
+        return undefined;
+    }
+    // Get all the tracer configs and combine them together
+    const tracedLanguageConfigs = {};
+    for (const language of tracedLanguages) {
+        tracedLanguageConfigs[language] = await getTracerConfigForLanguage(codeql, config, language);
+    }
+    const mainTracerConfig = concatTracerConfigs(tracedLanguageConfigs, config);
+    // Add a couple more variables
+    mainTracerConfig.env['ODASA_TRACER_CONFIGURATION'] = mainTracerConfig.spec;
+    const codeQLDir = path.dirname(codeql.getPath());
+    if (process.platform === 'darwin') {
+        mainTracerConfig.env['DYLD_INSERT_LIBRARIES'] = path.join(codeQLDir, 'tools', 'osx64', 'libtrace.dylib');
+    }
+    else if (process.platform !== 'win32') {
+        mainTracerConfig.env['LD_PRELOAD'] = path.join(codeQLDir, 'tools', 'linux64', '${LIB}trace.so');
+    }
+    return mainTracerConfig;
+}
+exports.getCombinedTracerConfig = getCombinedTracerConfig;
+//# sourceMappingURL=tracer-config.js.map
\ No newline at end of file
diff --git a/lib/tracer-config.js.map b/lib/tracer-config.js.map
new file mode 100644
index 000000000..077fa3ff4
--- /dev/null
+++ b/lib/tracer-config.js.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/lib/tracer-config.test.js b/lib/tracer-config.test.js
new file mode 100644
index 000000000..e3176bba7
--- /dev/null
+++ b/lib/tracer-config.test.js
@@ -0,0 +1,272 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const ava_1 = __importDefault(require("ava"));
+const fs = __importStar(require("fs"));
+const path = __importStar(require("path"));
+const codeql_1 = require("./codeql");
+const languages_1 = require("./languages");
+const testing_utils_1 = require("./testing-utils");
+const tracer_config_1 = require("./tracer-config");
+const util = __importStar(require("./util"));
+testing_utils_1.setupTests(ava_1.default);
+function getTestConfig(tmpDir) {
+    return {
+        languages: [languages_1.Language.java],
+        queries: {},
+        pathsIgnore: [],
+        paths: [],
+        originalUserInput: {},
+        tempDir: tmpDir,
+        toolCacheDir: tmpDir,
+        codeQLCmd: '',
+    };
+}
+// A very minimal setup
+ava_1.default('getTracerConfigForLanguage - minimal setup', async (t) => {
+    await util.withTmpDir(async (tmpDir) => {
+        const config = getTestConfig(tmpDir);
+        const codeQL = codeql_1.setCodeQL({
+            getTracerEnv: async function () {
+                return {
+                    'ODASA_TRACER_CONFIGURATION': 'abc',
+                    'foo': 'bar'
+                };
+            },
+        });
+        const result = await tracer_config_1.getTracerConfigForLanguage(codeQL, config, languages_1.Language.javascript);
+        t.deepEqual(result, { spec: 'abc', env: { 'foo': 'bar' } });
+    });
+});
+// Existing vars should not be overwritten, unless they are critical or prefixed with CODEQL_
+ava_1.default('getTracerConfigForLanguage - existing / critical vars', async (t) => {
+    await util.withTmpDir(async (tmpDir) => {
+        const config = getTestConfig(tmpDir);
+        // Set up some variables in the environment
+        process.env['foo'] = 'abc';
+        process.env['SEMMLE_PRELOAD_libtrace'] = 'abc';
+        process.env['SEMMLE_RUNNER'] = 'abc';
+        process.env['SEMMLE_COPY_EXECUTABLES_ROOT'] = 'abc';
+        process.env['SEMMLE_DEPTRACE_SOCKET'] = 'abc';
+        process.env['SEMMLE_JAVA_TOOL_OPTIONS'] = 'abc';
+        process.env['SEMMLE_DEPTRACE_SOCKET'] = 'abc';
+        process.env['CODEQL_VAR'] = 'abc';
+        // Now CodeQL returns all these variables, and one more, with different values
+        const codeQL = codeql_1.setCodeQL({
+            getTracerEnv: async function () {
+                return {
+                    'ODASA_TRACER_CONFIGURATION': 'abc',
+                    'foo': 'bar',
+                    'baz': 'qux',
+                    'SEMMLE_PRELOAD_libtrace': 'SEMMLE_PRELOAD_libtrace',
+                    'SEMMLE_RUNNER': 'SEMMLE_RUNNER',
+                    'SEMMLE_COPY_EXECUTABLES_ROOT': 'SEMMLE_COPY_EXECUTABLES_ROOT',
+                    'SEMMLE_DEPTRACE_SOCKET': 'SEMMLE_DEPTRACE_SOCKET',
+                    'SEMMLE_JAVA_TOOL_OPTIONS': 'SEMMLE_JAVA_TOOL_OPTIONS',
+                    'CODEQL_VAR': 'CODEQL_VAR',
+                };
+            },
+        });
+        const result = await tracer_config_1.getTracerConfigForLanguage(codeQL, config, languages_1.Language.javascript);
+        t.deepEqual(result, {
+            spec: 'abc',
+            env: {
+                // Should contain all variables except 'foo', because that already existed in the
+                // environment with a different value, and is not deemed a "critical" variable.
+                'baz': 'qux',
+                'SEMMLE_PRELOAD_libtrace': 'SEMMLE_PRELOAD_libtrace',
+                'SEMMLE_RUNNER': 'SEMMLE_RUNNER',
+                'SEMMLE_COPY_EXECUTABLES_ROOT': 'SEMMLE_COPY_EXECUTABLES_ROOT',
+                'SEMMLE_DEPTRACE_SOCKET': 'SEMMLE_DEPTRACE_SOCKET',
+                'SEMMLE_JAVA_TOOL_OPTIONS': 'SEMMLE_JAVA_TOOL_OPTIONS',
+                'CODEQL_VAR': 'CODEQL_VAR',
+            }
+        });
+    });
+});
+ava_1.default('concatTracerConfigs - minimal configs correctly combined', async (t) => {
+    await util.withTmpDir(async (tmpDir) => {
+        const config = getTestConfig(tmpDir);
+        const spec1 = path.join(tmpDir, 'spec1');
+        fs.writeFileSync(spec1, 'foo.log\n2\nabc\ndef');
+        const tc1 = {
+            spec: spec1,
+            env: {
+                'a': 'a',
+                'b': 'b',
+            }
+        };
+        const spec2 = path.join(tmpDir, 'spec2');
+        fs.writeFileSync(spec2, 'foo.log\n1\nghi');
+        const tc2 = {
+            spec: spec2,
+            env: {
+                'c': 'c',
+            }
+        };
+        const result = tracer_config_1.concatTracerConfigs({ 'javascript': tc1, 'python': tc2 }, config);
+        t.deepEqual(result, {
+            spec: path.join(tmpDir, 'compound-spec'),
+            env: {
+                'a': 'a',
+                'b': 'b',
+                'c': 'c',
+            }
+        });
+        t.true(fs.existsSync(result.spec));
+        t.deepEqual(fs.readFileSync(result.spec, 'utf8'), path.join(tmpDir, 'compound-build-tracer.log') + '\n3\nabc\ndef\nghi');
+    });
+});
+ava_1.default('concatTracerConfigs - conflicting env vars', async (t) => {
+    await util.withTmpDir(async (tmpDir) => {
+        const config = getTestConfig(tmpDir);
+        const spec = path.join(tmpDir, 'spec');
+        fs.writeFileSync(spec, 'foo.log\n0');
+        // Ok if env vars have the same name and the same value
+        t.deepEqual(tracer_config_1.concatTracerConfigs({
+            'javascript': { spec: spec, env: { 'a': 'a', 'b': 'b' } },
+            'python': { spec: spec, env: { 'b': 'b', 'c': 'c' } },
+        }, config).env, {
+            'a': 'a',
+            'b': 'b',
+            'c': 'c',
+        });
+        // Throws if env vars have same name but different values
+        const e = t.throws(() => tracer_config_1.concatTracerConfigs({
+            'javascript': { spec: spec, env: { 'a': 'a', 'b': 'b' } },
+            'python': { spec: spec, env: { 'b': 'c' } },
+        }, config));
+        t.deepEqual(e.message, 'Incompatible values in environment parameter b: b and c');
+    });
+});
+ava_1.default('concatTracerConfigs - cpp spec lines come last if present', async (t) => {
+    await util.withTmpDir(async (tmpDir) => {
+        const config = getTestConfig(tmpDir);
+        const spec1 = path.join(tmpDir, 'spec1');
+        fs.writeFileSync(spec1, 'foo.log\n2\nabc\ndef');
+        const tc1 = {
+            spec: spec1,
+            env: {
+                'a': 'a',
+                'b': 'b',
+            }
+        };
+        const spec2 = path.join(tmpDir, 'spec2');
+        fs.writeFileSync(spec2, 'foo.log\n1\nghi');
+        const tc2 = {
+            spec: spec2,
+            env: {
+                'c': 'c',
+            }
+        };
+        const result = tracer_config_1.concatTracerConfigs({ 'cpp': tc1, 'python': tc2 }, config);
+        t.deepEqual(result, {
+            spec: path.join(tmpDir, 'compound-spec'),
+            env: {
+                'a': 'a',
+                'b': 'b',
+                'c': 'c',
+            }
+        });
+        t.true(fs.existsSync(result.spec));
+        t.deepEqual(fs.readFileSync(result.spec, 'utf8'), path.join(tmpDir, 'compound-build-tracer.log') + '\n3\nghi\nabc\ndef');
+    });
+});
+ava_1.default('concatTracerConfigs - SEMMLE_COPY_EXECUTABLES_ROOT is updated to point to compound spec', async (t) => {
+    await util.withTmpDir(async (tmpDir) => {
+        const config = getTestConfig(tmpDir);
+        const spec = path.join(tmpDir, 'spec');
+        fs.writeFileSync(spec, 'foo.log\n0');
+        const result = tracer_config_1.concatTracerConfigs({
+            'javascript': { spec: spec, env: { 'a': 'a', 'b': 'b' } },
+            'python': { spec: spec, env: { 'SEMMLE_COPY_EXECUTABLES_ROOT': 'foo' } },
+        }, config);
+        t.deepEqual(result.env, {
+            'a': 'a',
+            'b': 'b',
+            'SEMMLE_COPY_EXECUTABLES_ROOT': path.join(tmpDir, 'compound-temp')
+        });
+    });
+});
+ava_1.default('concatTracerConfigs - compound environment file is created correctly', async (t) => {
+    await util.withTmpDir(async (tmpDir) => {
+        const config = getTestConfig(tmpDir);
+        const spec1 = path.join(tmpDir, 'spec1');
+        fs.writeFileSync(spec1, 'foo.log\n2\nabc\ndef');
+        const tc1 = {
+            spec: spec1,
+            env: {
+                'a': 'a',
+            }
+        };
+        const spec2 = path.join(tmpDir, 'spec2');
+        fs.writeFileSync(spec2, 'foo.log\n1\nghi');
+        const tc2 = {
+            spec: spec2,
+            env: {
+                'foo': 'bar_baz',
+            }
+        };
+        const result = tracer_config_1.concatTracerConfigs({ 'javascript': tc1, 'python': tc2 }, config);
+        const envPath = result.spec + '.environment';
+        t.true(fs.existsSync(envPath));
+        const buffer = fs.readFileSync(envPath);
+        // Contents is binary data
+        t.deepEqual(buffer.length, 28);
+        t.deepEqual(buffer.readInt32LE(0), 2); // number of env vars
+        t.deepEqual(buffer.readInt32LE(4), 4); // length of env var definition
+        t.deepEqual(buffer.toString('utf8', 8, 12), 'a=a\0'); // [key]=[value]\0
+        t.deepEqual(buffer.readInt32LE(12), 12); // length of env var definition
+        t.deepEqual(buffer.toString('utf8', 16, 28), 'foo=bar_baz\0'); // [key]=[value]\0
+    });
+});
+ava_1.default('getCombinedTracerConfig - return undefined when no languages are traced languages', async (t) => {
+    await util.withTmpDir(async (tmpDir) => {
+        const config = getTestConfig(tmpDir);
+        // No traced languages
+        config.languages = [languages_1.Language.javascript, languages_1.Language.python];
+        const codeQL = codeql_1.setCodeQL({
+            getTracerEnv: async function () {
+                return {
+                    'ODASA_TRACER_CONFIGURATION': 'abc',
+                    'foo': 'bar'
+                };
+            },
+        });
+        t.deepEqual(await tracer_config_1.getCombinedTracerConfig(config, codeQL), undefined);
+    });
+});
+ava_1.default('getCombinedTracerConfig - valid spec file', async (t) => {
+    await util.withTmpDir(async (tmpDir) => {
+        const config = getTestConfig(tmpDir);
+        const spec = path.join(tmpDir, 'spec');
+        fs.writeFileSync(spec, 'foo.log\n2\nabc\ndef');
+        const codeQL = codeql_1.setCodeQL({
+            getTracerEnv: async function () {
+                return {
+                    'ODASA_TRACER_CONFIGURATION': spec,
+                    'foo': 'bar',
+                };
+            },
+        });
+        const result = await tracer_config_1.getCombinedTracerConfig(config, codeQL);
+        t.deepEqual(result, {
+            spec: path.join(tmpDir, 'compound-spec'),
+            env: {
+                'foo': 'bar',
+                'ODASA_TRACER_CONFIGURATION': result.spec,
+                'LD_PRELOAD': path.join(path.dirname(codeQL.getPath()), 'tools', 'linux64', '${LIB}trace.so'),
+            }
+        });
+    });
+});
+//# sourceMappingURL=tracer-config.test.js.map
\ No newline at end of file
diff --git a/lib/tracer-config.test.js.map b/lib/tracer-config.test.js.map
new file mode 100644
index 000000000..8c61e8f02
--- /dev/null
+++ b/lib/tracer-config.test.js.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/lib/util.js b/lib/util.js
index a0e2d76bd..83496a567 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -378,4 +378,11 @@ function getCodeQLDatabasesDir(tempDir) {
     return path.resolve(tempDir, 'codeql_databases');
 }
 exports.getCodeQLDatabasesDir = getCodeQLDatabasesDir;
+/**
+ * Get the path where the CodeQL database for the given language lives.
+ */
+function getCodeQLDatabasePath(tempDir, language) {
+    return path.resolve(getCodeQLDatabasesDir(tempDir), language);
+}
+exports.getCodeQLDatabasePath = getCodeQLDatabasePath;
 //# sourceMappingURL=util.js.map
\ No newline at end of file
diff --git a/lib/util.js.map b/lib/util.js.map
index 3f1dd0676..62dad2447 100644
--- a/lib/util.js.map
+++ b/lib/util.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/analyze-action.ts b/src/analyze-action.ts
index 3b3798855..a77388e7f 100644
--- a/src/analyze-action.ts
+++ b/src/analyze-action.ts
@@ -58,36 +58,35 @@ async function sendStatusReport(
   await util.sendStatusReport(statusReport);
 }
 
-async function createdDBForScannedLanguages(databaseFolder: string, config: configUtils.Config) {
+async function createdDBForScannedLanguages(config: configUtils.Config) {
   const codeql = getCodeQL(config.codeQLCmd);
   for (const language of config.languages) {
     if (isScannedLanguage(language)) {
       core.startGroup('Extracting ' + language);
-      await codeql.extractScannedLanguage(path.join(databaseFolder, language), language);
+      await codeql.extractScannedLanguage(util.getCodeQLDatabasePath(config.tempDir, language), language);
       core.endGroup();
     }
   }
 }
 
-async function finalizeDatabaseCreation(databaseFolder: string, config: configUtils.Config) {
-  await createdDBForScannedLanguages(databaseFolder, config);
+async function finalizeDatabaseCreation(config: configUtils.Config) {
+  await createdDBForScannedLanguages(config);
 
   const codeql = getCodeQL(config.codeQLCmd);
   for (const language of config.languages) {
     core.startGroup('Finalizing ' + language);
-    await codeql.finalizeDatabase(path.join(databaseFolder, language));
+    await codeql.finalizeDatabase(util.getCodeQLDatabasePath(config.tempDir, language));
     core.endGroup();
   }
 }
 
 // Runs queries and creates sarif files in the given folder
 async function runQueries(
-  databaseFolder: string,
   sarifFolder: string,
   config: configUtils.Config): Promise<QueriesStatusReport> {
 
   const codeql = getCodeQL(config.codeQLCmd);
-  for (let language of fs.readdirSync(databaseFolder)) {
+  for (let language of config.languages) {
     core.startGroup('Analyzing ' + language);
 
     const queries = config.queries[language] || [];
@@ -96,16 +95,17 @@ async function runQueries(
     }
 
     try {
+      const databasePath = util.getCodeQLDatabasePath(config.tempDir, language);
       // Pass the queries to codeql using a file instead of using the command
       // line to avoid command line length restrictions, particularly on windows.
-      const querySuite = path.join(databaseFolder, language + '-queries.qls');
+      const querySuite = databasePath + '-queries.qls';
       const querySuiteContents = queries.map(q => '- query: ' + q).join('\n');
       fs.writeFileSync(querySuite, querySuiteContents);
       core.debug('Query suite file for ' + language + '...\n' + querySuiteContents);
 
       const sarifFile = path.join(sarifFolder, language + '.sarif');
 
-      await codeql.databaseAnalyze(path.join(databaseFolder, language), sarifFile, querySuite);
+      await codeql.databaseAnalyze(databasePath, sarifFile, querySuite);
 
       core.debug('SARIF results for database ' + language + ' created at "' + sarifFile + '"');
       core.endGroup();
@@ -135,16 +135,14 @@ async function run() {
     core.exportVariable(sharedEnv.ODASA_TRACER_CONFIGURATION, '');
     delete process.env[sharedEnv.ODASA_TRACER_CONFIGURATION];
 
-    const databaseFolder = util.getCodeQLDatabasesDir(config.tempDir);
-
     const sarifFolder = core.getInput('output');
     fs.mkdirSync(sarifFolder, { recursive: true });
 
     core.info('Finalizing database creation');
-    await finalizeDatabaseCreation(databaseFolder, config);
+    await finalizeDatabaseCreation(config);
 
     core.info('Analyzing database');
-    queriesStats = await runQueries(databaseFolder, sarifFolder, config);
+    queriesStats = await runQueries(sarifFolder, config);
 
     if ('true' === core.getInput('upload')) {
       uploadStats = await upload_lib.upload(
diff --git a/src/codeql.ts b/src/codeql.ts
index ddf93aed8..ce537ab9a 100644
--- a/src/codeql.ts
+++ b/src/codeql.ts
@@ -49,7 +49,7 @@ export interface CodeQL {
    * Run 'codeql database trace-command' on 'tracer-env.js' and parse
    * the result to get environment variables set by CodeQL.
    */
-  getTracerEnv(databasePath: string, compilerSpec: string | undefined): Promise<{ [key: string]: string }>;
+  getTracerEnv(databasePath: string): Promise<{ [key: string]: string }>;
   /**
    * Run 'codeql database init'.
    */
@@ -316,14 +316,12 @@ function getCodeQLForCmd(cmd: string): CodeQL {
         '--format=json'
       ]);
     },
-    getTracerEnv: async function(databasePath: string, compilerSpec: string | undefined) {
+    getTracerEnv: async function(databasePath: string) {
       let envFile = path.resolve(databasePath, 'working', 'env.tmp');
-      const compilerSpecArg = compilerSpec ? ["--compiler-spec=" + compilerSpec] : [];
       await exec.exec(cmd, [
         'database',
         'trace-command',
         databasePath,
-        ...compilerSpecArg,
         ...getExtraOptionsFromEnv(['database', 'trace-command']),
         process.execPath,
         path.resolve(__dirname, 'tracer-env.js'),
diff --git a/src/init-action.ts b/src/init-action.ts
index 9e25439da..794dc1477 100644
--- a/src/init-action.ts
+++ b/src/init-action.ts
@@ -6,129 +6,9 @@ import * as path from 'path';
 import * as analysisPaths from './analysis-paths';
 import { CodeQL, setupCodeQL } from './codeql';
 import * as configUtils from './config-utils';
-import { isTracedLanguage } from './languages';
+import { getCombinedTracerConfig } from './tracer-config';
 import * as util from './util';
 
-type TracerConfig = {
-  spec: string;
-  env: { [key: string]: string };
-};
-
-const CRITICAL_TRACER_VARS = new Set(
-  ['SEMMLE_PRELOAD_libtrace',
-    , 'SEMMLE_RUNNER',
-    , 'SEMMLE_COPY_EXECUTABLES_ROOT',
-    , 'SEMMLE_DEPTRACE_SOCKET',
-    , 'SEMMLE_JAVA_TOOL_OPTIONS'
-  ]);
-
-async function tracerConfig(
-  codeql: CodeQL,
-  database: string,
-  compilerSpec?: string): Promise<TracerConfig> {
-
-  const env = await codeql.getTracerEnv(database, compilerSpec);
-
-  const config = env['ODASA_TRACER_CONFIGURATION'];
-  const info: TracerConfig = { spec: config, env: {} };
-
-  // Extract critical tracer variables from the environment
-  for (let entry of Object.entries(env)) {
-    const key = entry[0];
-    const value = entry[1];
-    // skip ODASA_TRACER_CONFIGURATION as it is handled separately
-    if (key === 'ODASA_TRACER_CONFIGURATION') {
-      continue;
-    }
-    // skip undefined values
-    if (typeof value === 'undefined') {
-      continue;
-    }
-    // Keep variables that do not exist in current environment. In addition always keep
-    // critical and CODEQL_ variables
-    if (typeof process.env[key] === 'undefined' || CRITICAL_TRACER_VARS.has(key) || key.startsWith('CODEQL_')) {
-      info.env[key] = value;
-    }
-  }
-  return info;
-}
-
-function concatTracerConfigs(tracerConfigs: TracerConfig[], config: configUtils.Config): TracerConfig {
-  // A tracer config is a map containing additional environment variables and a tracer 'spec' file.
-  // A tracer 'spec' file has the following format [log_file, number_of_blocks, blocks_text]
-
-  // Merge the environments
-  const env: { [key: string]: string; } = {};
-  let copyExecutables = false;
-  let envSize = 0;
-  for (const v of tracerConfigs) {
-    for (let e of Object.entries(v.env)) {
-      const name = e[0];
-      const value = e[1];
-      // skip SEMMLE_COPY_EXECUTABLES_ROOT as it is handled separately
-      if (name === 'SEMMLE_COPY_EXECUTABLES_ROOT') {
-        copyExecutables = true;
-      } else if (name in env) {
-        if (env[name] !== value) {
-          throw Error('Incompatible values in environment parameter ' +
-            name + ': ' + env[name] + ' and ' + value);
-        }
-      } else {
-        env[name] = value;
-        envSize += 1;
-      }
-    }
-  }
-
-  // Concatenate spec files into a new spec file
-  let languages = Object.keys(tracerConfigs);
-  const cppIndex = languages.indexOf('cpp');
-  // Make sure cpp is the last language, if it's present since it must be concatenated last
-  if (cppIndex !== -1) {
-    let lastLang = languages[languages.length - 1];
-    languages[languages.length - 1] = languages[cppIndex];
-    languages[cppIndex] = lastLang;
-  }
-
-  let totalLines: string[] = [];
-  let totalCount = 0;
-  for (let lang of languages) {
-    const lines = fs.readFileSync(tracerConfigs[lang].spec, 'utf8').split(/\r?\n/);
-    const count = parseInt(lines[1], 10);
-    totalCount += count;
-    totalLines.push(...lines.slice(2));
-  }
-
-  const newLogFilePath = path.resolve(config.tempDir, 'compound-build-tracer.log');
-  const spec = path.resolve(config.tempDir, 'compound-spec');
-  const compoundTempFolder = path.resolve(config.tempDir, 'compound-temp');
-  const newSpecContent = [newLogFilePath, totalCount.toString(10), ...totalLines];
-
-  if (copyExecutables) {
-    env['SEMMLE_COPY_EXECUTABLES_ROOT'] = compoundTempFolder;
-    envSize += 1;
-  }
-
-  fs.writeFileSync(spec, newSpecContent.join('\n'));
-
-  // Prepare the content of the compound environment file
-  let buffer = Buffer.alloc(4);
-  buffer.writeInt32LE(envSize, 0);
-  for (let e of Object.entries(env)) {
-    const key = e[0];
-    const value = e[1];
-    const lineBuffer = new Buffer(key + '=' + value + '\0', 'utf8');
-    const sizeBuffer = Buffer.alloc(4);
-    sizeBuffer.writeInt32LE(lineBuffer.length, 0);
-    buffer = Buffer.concat([buffer, sizeBuffer, lineBuffer]);
-  }
-  // Write the compound environment
-  const envPath = spec + '.environment';
-  fs.writeFileSync(envPath, buffer);
-
-  return { env, spec };
-}
-
 interface InitSuccessStatusReport extends util.StatusReportBase {
   // Comma-separated list of languages that analysis was run for
   // This may be from the workflow file or may be calculated from repository contents
@@ -215,48 +95,30 @@ async function run() {
     const codeqlRam = process.env['CODEQL_RAM'] || '6500';
     core.exportVariable('CODEQL_RAM', codeqlRam);
 
-    const databaseFolder = util.getCodeQLDatabasesDir(config.tempDir);
-    fs.mkdirSync(databaseFolder, { recursive: true });
+    fs.mkdirSync(util.getCodeQLDatabasesDir(config.tempDir), { recursive: true });
 
-    let tracedLanguageConfigs: TracerConfig[] = [];
     // TODO: replace this code once CodeQL supports multi-language tracing
     for (let language of config.languages) {
-      const languageDatabase = path.join(databaseFolder, language);
-
       // Init language database
-      await codeql.databaseInit(languageDatabase, language, sourceRoot);
-      // TODO: add better detection of 'traced languages' instead of using a hard coded list
-      if (isTracedLanguage(language)) {
-        const config: TracerConfig = await tracerConfig(codeql, languageDatabase);
-        tracedLanguageConfigs.push(config);
-      }
+      await codeql.databaseInit(util.getCodeQLDatabasePath(config.tempDir, language), language, sourceRoot);
     }
-    if (tracedLanguageConfigs.length > 0) {
-      const mainTracerConfig = concatTracerConfigs(tracedLanguageConfigs, config);
-      if (mainTracerConfig.spec) {
-        for (let entry of Object.entries(mainTracerConfig.env)) {
-          core.exportVariable(entry[0], entry[1]);
-        }
 
-        core.exportVariable('ODASA_TRACER_CONFIGURATION', mainTracerConfig.spec);
-        const codeQLDir = path.dirname(codeql.getPath());
-        if (process.platform === 'darwin') {
-          core.exportVariable(
-            'DYLD_INSERT_LIBRARIES',
-            path.join(codeQLDir, 'tools', 'osx64', 'libtrace.dylib'));
-        } else if (process.platform === 'win32') {
-          await exec.exec(
-            'powershell',
-            [
-              path.resolve(__dirname, '..', 'src', 'inject-tracer.ps1'),
-              path.resolve(codeQLDir, 'tools', 'win64', 'tracer.exe'),
-            ],
-            { env: { 'ODASA_TRACER_CONFIGURATION': mainTracerConfig.spec } });
-        } else {
-          core.exportVariable('LD_PRELOAD', path.join(codeQLDir, 'tools', 'linux64', '${LIB}trace.so'));
-        }
+    const tracerConfig = await getCombinedTracerConfig(config, codeql);
+    if (tracerConfig !== undefined) {
+      if (process.platform === 'win32') {
+        await exec.exec(
+          'powershell',
+          [
+            path.resolve(__dirname, '..', 'src', 'inject-tracer.ps1'),
+            path.resolve(path.dirname(codeql.getPath()), 'tools', 'win64', 'tracer.exe'),
+          ],
+          { env: { 'ODASA_TRACER_CONFIGURATION': tracerConfig.spec } });
       }
+
+      // NB: in CLI mode these will be output to a file rather than exported with core.exportVariable
+      Object.entries(tracerConfig.env).forEach(([key, value]) => core.exportVariable(key, value));
     }
+
   } catch (error) {
     core.setFailed(error.message);
     console.log(error);
diff --git a/src/tracer-config.test.ts b/src/tracer-config.test.ts
new file mode 100644
index 000000000..50e045121
--- /dev/null
+++ b/src/tracer-config.test.ts
@@ -0,0 +1,311 @@
+import test from 'ava';
+import * as fs from 'fs';
+import * as path from 'path';
+
+import { setCodeQL } from './codeql';
+import * as configUtils from './config-utils';
+import { Language } from './languages';
+import { setupTests } from './testing-utils';
+import { concatTracerConfigs, getCombinedTracerConfig, getTracerConfigForLanguage } from './tracer-config';
+import * as util from './util';
+
+setupTests(test);
+
+function getTestConfig(tmpDir: string): configUtils.Config {
+  return {
+    languages: [Language.java],
+    queries: {},
+    pathsIgnore: [],
+    paths: [],
+    originalUserInput: {},
+    tempDir: tmpDir,
+    toolCacheDir: tmpDir,
+    codeQLCmd: '',
+  };
+}
+
+// A very minimal setup
+test('getTracerConfigForLanguage - minimal setup', async t => {
+  await util.withTmpDir(async tmpDir => {
+    const config = getTestConfig(tmpDir);
+
+    const codeQL = setCodeQL({
+      getTracerEnv: async function() {
+        return {
+          'ODASA_TRACER_CONFIGURATION': 'abc',
+          'foo': 'bar'
+        };
+      },
+    });
+
+    const result = await getTracerConfigForLanguage(codeQL, config, Language.javascript);
+    t.deepEqual(result, { spec: 'abc', env: {'foo': 'bar'} });
+  });
+});
+
+// Existing vars should not be overwritten, unless they are critical or prefixed with CODEQL_
+test('getTracerConfigForLanguage - existing / critical vars', async t => {
+  await util.withTmpDir(async tmpDir => {
+    const config = getTestConfig(tmpDir);
+
+    // Set up some variables in the environment
+    process.env['foo'] = 'abc';
+    process.env['SEMMLE_PRELOAD_libtrace'] = 'abc';
+    process.env['SEMMLE_RUNNER'] = 'abc';
+    process.env['SEMMLE_COPY_EXECUTABLES_ROOT'] = 'abc';
+    process.env['SEMMLE_DEPTRACE_SOCKET'] = 'abc';
+    process.env['SEMMLE_JAVA_TOOL_OPTIONS'] = 'abc';
+    process.env['SEMMLE_DEPTRACE_SOCKET'] = 'abc';
+    process.env['CODEQL_VAR'] = 'abc';
+
+    // Now CodeQL returns all these variables, and one more, with different values
+    const codeQL = setCodeQL({
+      getTracerEnv: async function() {
+        return {
+          'ODASA_TRACER_CONFIGURATION': 'abc',
+          'foo': 'bar',
+          'baz': 'qux',
+          'SEMMLE_PRELOAD_libtrace': 'SEMMLE_PRELOAD_libtrace',
+          'SEMMLE_RUNNER': 'SEMMLE_RUNNER',
+          'SEMMLE_COPY_EXECUTABLES_ROOT': 'SEMMLE_COPY_EXECUTABLES_ROOT',
+          'SEMMLE_DEPTRACE_SOCKET': 'SEMMLE_DEPTRACE_SOCKET',
+          'SEMMLE_JAVA_TOOL_OPTIONS': 'SEMMLE_JAVA_TOOL_OPTIONS',
+          'CODEQL_VAR': 'CODEQL_VAR',
+        };
+      },
+    });
+
+    const result = await getTracerConfigForLanguage(codeQL, config, Language.javascript);
+    t.deepEqual(result, {
+      spec: 'abc',
+      env: {
+        // Should contain all variables except 'foo', because that already existed in the
+        // environment with a different value, and is not deemed a "critical" variable.
+        'baz': 'qux',
+        'SEMMLE_PRELOAD_libtrace': 'SEMMLE_PRELOAD_libtrace',
+        'SEMMLE_RUNNER': 'SEMMLE_RUNNER',
+        'SEMMLE_COPY_EXECUTABLES_ROOT': 'SEMMLE_COPY_EXECUTABLES_ROOT',
+        'SEMMLE_DEPTRACE_SOCKET': 'SEMMLE_DEPTRACE_SOCKET',
+        'SEMMLE_JAVA_TOOL_OPTIONS': 'SEMMLE_JAVA_TOOL_OPTIONS',
+        'CODEQL_VAR': 'CODEQL_VAR',
+      }
+    });
+  });
+});
+
+test('concatTracerConfigs - minimal configs correctly combined', async t => {
+  await util.withTmpDir(async tmpDir => {
+    const config = getTestConfig(tmpDir);
+
+    const spec1 = path.join(tmpDir, 'spec1');
+    fs.writeFileSync(spec1, 'foo.log\n2\nabc\ndef');
+    const tc1 = {
+      spec: spec1,
+      env: {
+        'a': 'a',
+        'b': 'b',
+      }
+    };
+
+    const spec2 = path.join(tmpDir, 'spec2');
+    fs.writeFileSync(spec2, 'foo.log\n1\nghi');
+    const tc2 = {
+      spec: spec2,
+      env: {
+        'c': 'c',
+      }
+    };
+
+    const result = concatTracerConfigs({ 'javascript': tc1, 'python': tc2 }, config);
+    t.deepEqual(result, {
+      spec: path.join(tmpDir, 'compound-spec'),
+      env: {
+        'a': 'a',
+        'b': 'b',
+        'c': 'c',
+      }
+    });
+    t.true(fs.existsSync(result.spec));
+    t.deepEqual(
+      fs.readFileSync(result.spec, 'utf8'),
+      path.join(tmpDir, 'compound-build-tracer.log') + '\n3\nabc\ndef\nghi');
+  });
+});
+
+test('concatTracerConfigs - conflicting env vars', async t => {
+  await util.withTmpDir(async tmpDir => {
+    const config = getTestConfig(tmpDir);
+
+    const spec = path.join(tmpDir, 'spec');
+    fs.writeFileSync(spec, 'foo.log\n0');
+
+    // Ok if env vars have the same name and the same value
+    t.deepEqual(
+      concatTracerConfigs(
+        {
+          'javascript': {spec: spec, env: {'a': 'a', 'b': 'b'}},
+          'python': {spec: spec, env: {'b': 'b', 'c': 'c'}},
+        },
+        config).env,
+      {
+        'a': 'a',
+        'b': 'b',
+        'c': 'c',
+      });
+
+    // Throws if env vars have same name but different values
+    const e = t.throws(() =>
+      concatTracerConfigs(
+        {
+          'javascript': {spec: spec, env: {'a': 'a', 'b': 'b'}},
+          'python': {spec: spec, env: {'b': 'c'}},
+        },
+        config));
+    t.deepEqual(e.message, 'Incompatible values in environment parameter b: b and c');
+  });
+});
+
+test('concatTracerConfigs - cpp spec lines come last if present', async t => {
+  await util.withTmpDir(async tmpDir => {
+    const config = getTestConfig(tmpDir);
+
+    const spec1 = path.join(tmpDir, 'spec1');
+    fs.writeFileSync(spec1, 'foo.log\n2\nabc\ndef');
+    const tc1 = {
+      spec: spec1,
+      env: {
+        'a': 'a',
+        'b': 'b',
+      }
+    };
+
+    const spec2 = path.join(tmpDir, 'spec2');
+    fs.writeFileSync(spec2, 'foo.log\n1\nghi');
+    const tc2 = {
+      spec: spec2,
+      env: {
+        'c': 'c',
+      }
+    };
+
+    const result = concatTracerConfigs({ 'cpp': tc1, 'python': tc2 }, config);
+    t.deepEqual(result, {
+      spec: path.join(tmpDir, 'compound-spec'),
+      env: {
+        'a': 'a',
+        'b': 'b',
+        'c': 'c',
+      }
+    });
+    t.true(fs.existsSync(result.spec));
+    t.deepEqual(
+      fs.readFileSync(result.spec, 'utf8'),
+      path.join(tmpDir, 'compound-build-tracer.log') + '\n3\nghi\nabc\ndef');
+  });
+});
+
+test('concatTracerConfigs - SEMMLE_COPY_EXECUTABLES_ROOT is updated to point to compound spec', async t => {
+  await util.withTmpDir(async tmpDir => {
+    const config = getTestConfig(tmpDir);
+
+    const spec = path.join(tmpDir, 'spec');
+    fs.writeFileSync(spec, 'foo.log\n0');
+
+    const result = concatTracerConfigs(
+      {
+        'javascript': {spec: spec, env: {'a': 'a', 'b': 'b'}},
+        'python': {spec: spec, env: {'SEMMLE_COPY_EXECUTABLES_ROOT': 'foo'}},
+      },
+      config);
+
+    t.deepEqual(result.env, {
+      'a': 'a',
+      'b': 'b',
+      'SEMMLE_COPY_EXECUTABLES_ROOT': path.join(tmpDir, 'compound-temp')
+    });
+  });
+});
+
+test('concatTracerConfigs - compound environment file is created correctly', async t => {
+  await util.withTmpDir(async tmpDir => {
+    const config = getTestConfig(tmpDir);
+
+    const spec1 = path.join(tmpDir, 'spec1');
+    fs.writeFileSync(spec1, 'foo.log\n2\nabc\ndef');
+    const tc1 = {
+      spec: spec1,
+      env: {
+        'a': 'a',
+      }
+    };
+
+    const spec2 = path.join(tmpDir, 'spec2');
+    fs.writeFileSync(spec2, 'foo.log\n1\nghi');
+    const tc2 = {
+      spec: spec2,
+      env: {
+        'foo': 'bar_baz',
+      }
+    };
+
+    const result = concatTracerConfigs({ 'javascript': tc1, 'python': tc2 }, config);
+    const envPath = result.spec + '.environment';
+    t.true(fs.existsSync(envPath));
+
+    const buffer: Buffer = fs.readFileSync(envPath);
+    // Contents is binary data
+    t.deepEqual(buffer.length, 28);
+    t.deepEqual(buffer.readInt32LE(0), 2); // number of env vars
+    t.deepEqual(buffer.readInt32LE(4), 4); // length of env var definition
+    t.deepEqual(buffer.toString('utf8', 8, 12), 'a=a\0'); // [key]=[value]\0
+    t.deepEqual(buffer.readInt32LE(12), 12);  // length of env var definition
+    t.deepEqual(buffer.toString('utf8', 16, 28), 'foo=bar_baz\0'); // [key]=[value]\0
+  });
+});
+
+test('getCombinedTracerConfig - return undefined when no languages are traced languages', async t => {
+  await util.withTmpDir(async tmpDir => {
+    const config = getTestConfig(tmpDir);
+    // No traced languages
+    config.languages = [Language.javascript, Language.python];
+
+    const codeQL = setCodeQL({
+      getTracerEnv: async function() {
+        return {
+          'ODASA_TRACER_CONFIGURATION': 'abc',
+          'foo': 'bar'
+        };
+      },
+    });
+
+    t.deepEqual(await getCombinedTracerConfig(config, codeQL), undefined);
+  });
+});
+
+test('getCombinedTracerConfig - valid spec file', async t => {
+  await util.withTmpDir(async tmpDir => {
+    const config = getTestConfig(tmpDir);
+
+    const spec = path.join(tmpDir, 'spec');
+    fs.writeFileSync(spec, 'foo.log\n2\nabc\ndef');
+
+    const codeQL = setCodeQL({
+      getTracerEnv: async function() {
+        return {
+          'ODASA_TRACER_CONFIGURATION': spec,
+          'foo': 'bar',
+        };
+      },
+    });
+
+    const result = await getCombinedTracerConfig(config, codeQL);
+    t.deepEqual(result, {
+      spec: path.join(tmpDir, 'compound-spec'),
+      env: {
+        'foo': 'bar',
+        'ODASA_TRACER_CONFIGURATION': result!.spec,
+        'LD_PRELOAD': path.join(path.dirname(codeQL.getPath()), 'tools', 'linux64', '${LIB}trace.so'),
+      }
+    });
+  });
+});
diff --git a/src/tracer-config.ts b/src/tracer-config.ts
new file mode 100644
index 000000000..1bc64c400
--- /dev/null
+++ b/src/tracer-config.ts
@@ -0,0 +1,159 @@
+import * as fs from 'fs';
+import * as path from 'path';
+
+import { CodeQL } from './codeql';
+import * as configUtils from './config-utils';
+import { isTracedLanguage, Language } from './languages';
+import * as util from './util';
+
+export type TracerConfig = {
+  spec: string;
+  env: { [key: string]: string };
+};
+
+const CRITICAL_TRACER_VARS = new Set(
+  ['SEMMLE_PRELOAD_libtrace',
+    , 'SEMMLE_RUNNER',
+    , 'SEMMLE_COPY_EXECUTABLES_ROOT',
+    , 'SEMMLE_DEPTRACE_SOCKET',
+    , 'SEMMLE_JAVA_TOOL_OPTIONS'
+  ]);
+
+export async function getTracerConfigForLanguage(
+  codeql: CodeQL,
+  config: configUtils.Config,
+  language: Language): Promise<TracerConfig> {
+
+  const env = await codeql.getTracerEnv(util.getCodeQLDatabasePath(config.tempDir, language));
+
+  const spec = env['ODASA_TRACER_CONFIGURATION'];
+  const info: TracerConfig = { spec, env: {} };
+
+  // Extract critical tracer variables from the environment
+  for (let entry of Object.entries(env)) {
+    const key = entry[0];
+    const value = entry[1];
+    // skip ODASA_TRACER_CONFIGURATION as it is handled separately
+    if (key === 'ODASA_TRACER_CONFIGURATION') {
+      continue;
+    }
+    // skip undefined values
+    if (typeof value === 'undefined') {
+      continue;
+    }
+    // Keep variables that do not exist in current environment. In addition always keep
+    // critical and CODEQL_ variables
+    if (typeof process.env[key] === 'undefined' || CRITICAL_TRACER_VARS.has(key) || key.startsWith('CODEQL_')) {
+      info.env[key] = value;
+    }
+  }
+  return info;
+}
+
+export function concatTracerConfigs(
+  tracerConfigs: { [lang: string]: TracerConfig },
+  config: configUtils.Config): TracerConfig {
+
+  // A tracer config is a map containing additional environment variables and a tracer 'spec' file.
+  // A tracer 'spec' file has the following format [log_file, number_of_blocks, blocks_text]
+
+  // Merge the environments
+  const env: { [key: string]: string; } = {};
+  let copyExecutables = false;
+  let envSize = 0;
+  for (const v of Object.values(tracerConfigs)) {
+    for (let e of Object.entries(v.env)) {
+      const name = e[0];
+      const value = e[1];
+      // skip SEMMLE_COPY_EXECUTABLES_ROOT as it is handled separately
+      if (name === 'SEMMLE_COPY_EXECUTABLES_ROOT') {
+        copyExecutables = true;
+      } else if (name in env) {
+        if (env[name] !== value) {
+          throw Error('Incompatible values in environment parameter ' +
+            name + ': ' + env[name] + ' and ' + value);
+        }
+      } else {
+        env[name] = value;
+        envSize += 1;
+      }
+    }
+  }
+
+  // Concatenate spec files into a new spec file
+  let languages = Object.keys(tracerConfigs);
+  const cppIndex = languages.indexOf('cpp');
+  // Make sure cpp is the last language, if it's present since it must be concatenated last
+  if (cppIndex !== -1) {
+    let lastLang = languages[languages.length - 1];
+    languages[languages.length - 1] = languages[cppIndex];
+    languages[cppIndex] = lastLang;
+  }
+
+  let totalLines: string[] = [];
+  let totalCount = 0;
+  for (let lang of languages) {
+    const lines = fs.readFileSync(tracerConfigs[lang].spec, 'utf8').split(/\r?\n/);
+    const count = parseInt(lines[1], 10);
+    totalCount += count;
+    totalLines.push(...lines.slice(2));
+  }
+
+  const newLogFilePath = path.resolve(config.tempDir, 'compound-build-tracer.log');
+  const spec = path.resolve(config.tempDir, 'compound-spec');
+  const compoundTempFolder = path.resolve(config.tempDir, 'compound-temp');
+  const newSpecContent = [newLogFilePath, totalCount.toString(10), ...totalLines];
+
+  if (copyExecutables) {
+    env['SEMMLE_COPY_EXECUTABLES_ROOT'] = compoundTempFolder;
+    envSize += 1;
+  }
+
+  fs.writeFileSync(spec, newSpecContent.join('\n'));
+
+  // Prepare the content of the compound environment file
+  let buffer = Buffer.alloc(4);
+  buffer.writeInt32LE(envSize, 0);
+  for (let e of Object.entries(env)) {
+    const key = e[0];
+    const value = e[1];
+    const lineBuffer = new Buffer(key + '=' + value + '\0', 'utf8');
+    const sizeBuffer = Buffer.alloc(4);
+    sizeBuffer.writeInt32LE(lineBuffer.length, 0);
+    buffer = Buffer.concat([buffer, sizeBuffer, lineBuffer]);
+  }
+  // Write the compound environment
+  const envPath = spec + '.environment';
+  fs.writeFileSync(envPath, buffer);
+
+  return { env, spec };
+}
+
+export async function getCombinedTracerConfig(
+  config: configUtils.Config,
+  codeql: CodeQL): Promise<TracerConfig | undefined> {
+
+  // Abort if there are no traced languages as there's nothing to do
+  const tracedLanguages = config.languages.filter(isTracedLanguage);
+  if (tracedLanguages.length === 0) {
+    return undefined;
+  }
+
+  // Get all the tracer configs and combine them together
+  const tracedLanguageConfigs: { [lang: string]: TracerConfig } = {};
+  for (const language of tracedLanguages) {
+    tracedLanguageConfigs[language] = await getTracerConfigForLanguage(codeql, config, language);
+  }
+  const mainTracerConfig = concatTracerConfigs(tracedLanguageConfigs, config);
+
+  // Add a couple more variables
+  mainTracerConfig.env['ODASA_TRACER_CONFIGURATION'] = mainTracerConfig.spec;
+  const codeQLDir = path.dirname(codeql.getPath());
+  if (process.platform === 'darwin') {
+    mainTracerConfig.env['DYLD_INSERT_LIBRARIES'] = path.join(codeQLDir, 'tools', 'osx64', 'libtrace.dylib');
+  } else if (process.platform !== 'win32') {
+    mainTracerConfig.env['LD_PRELOAD'] = path.join(codeQLDir, 'tools', 'linux64', '${LIB}trace.so');
+  }
+
+  return mainTracerConfig;
+}
diff --git a/src/util.ts b/src/util.ts
index c4bf9c93e..6db99ba08 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -5,6 +5,7 @@ import * as os from 'os';
 import * as path from 'path';
 
 import * as api from './api-client';
+import { Language } from './languages';
 import * as sharedEnv from './shared-environment';
 
 /**
@@ -433,3 +434,10 @@ export function getThreadsFlag(): string {
 export function getCodeQLDatabasesDir(tempDir: string) {
   return path.resolve(tempDir, 'codeql_databases');
 }
+
+/**
+ * Get the path where the CodeQL database for the given language lives.
+ */
+export function getCodeQLDatabasePath(tempDir: string, language: Language) {
+  return path.resolve(getCodeQLDatabasesDir(tempDir), language);
+}