# GCOV Coverage analysis for C/C++ code on Linux **URL:** \ **Category:** SonarQube Server / Community Build\ **Tags:** cfamily, sonarqube, coverage\ **Created:** [August 14, 2019, 7:32am UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100 "2019-08-14T07:32:26Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![peter.toft](https://avatars.discourse-cdn.com/v4/letter/p/58956e/32.png) [@peter.toft](https://community.sonarsource.com/u/peter.toft)\ **Post date:** [August 14, 2019, 7:32am UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100/1 "2019-08-14T07:32:26Z")
Must-share information (formatted with [Markdown](https://commonmark.org/help/)): - which versions are you using: SonarQube Developer Edition - Version 7.9 (build 26994) - what are you trying to achieve: I am trying to get the code coverage working using sonar.cfamily.gcov.reportsPath - what have you tried so far to achieve this: Read below Try to clone [GitHub - peter-toft-greve/democode\_sonarqube](https://github.com/peter-toft-greve/democode_sonarqube) on a normal Linux machine - where gcov is installed. With “make” I make code coverage analysis into “demo.gcov” like this * * * ``` GCC Code Coverage Report ``` ## Directory: . ## File Lines Exec Cover Missing ## ext\_fct.c 5 4 80% 6 main.c 5 4 80% 8 ## TOTAL 10 8 80% I would hope/expect that adding -Dsonar.cfamily.gcov.reportsPath=. to the sonar-scanner command (cf. [Overview | SonarQube Server 2025.5 | Sonar Documentation](https://docs.sonarqube.org/latest/analysis/coverage/)) I could have SonarQube show the coverage integrated into the web. At the moment I have zero coverage and with the sonar.cfamily.gcov.reportsPath activated I have the sonar-scanner failing with **09:30:30** java.lang.NullPointerException **09:30:30** at org.sonar.api.batch.fs.internal.DefaultFilePredicates.is(DefaultFilePredicates.java:135) **09:30:30** at com.sonar.cpp.plugin.gcov.GcovSensor.lambda$execute$2(GcovSensor.java:56) **09:30:30** at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(Unknown Source) **09:30:30** at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) **09:30:30** at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) **09:30:30** at java.base/java.util.stream.ReferencePipeline$2$1.accept(Unknown Source) **09:30:30** at java.base/java.util.Iterator.forEachRemaining(Unknown Source) **09:30:30** at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source) **09:30:30** at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source) **09:30:30** at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) **09:30:30** at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown Source) **09:30:30** at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown Source) **09:30:30** at java.base/java.util.stream.AbstractPipeline.evaluate(Unknown Source) **09:30:30** at java.base/java.util.stream.ReferencePipeline.forEach(Unknown Source) **09:30:30** at com.sonar.cpp.plugin.gcov.GcovSensor.scan(GcovSensor.java:75) **09:30:30** at com.sonar.cpp.plugin.gcov.GcovSensor.execute(GcovSensor.java:52) **09:30:30** at org.sonar.scanner.sensor.AbstractSensorWrapper.analyse(AbstractSensorWrapper.java:48) **09:30:30** at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:85) **09:30:30** at org.sonar.scanner.sensor.ModuleSensorsExecutor.lambda$execute$1(ModuleSensorsExecutor.java:59) **09:30:30** at org.sonar.scanner.sensor.ModuleSensorsExecutor.withModuleStrategy(ModuleSensorsExecutor.java:77) **09:30:30** at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:59) **09:30:30** at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:82) **09:30:30** at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136) **09:30:30** at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122) **09:30:30** at org.sonar.scanner.scan.ProjectScanContainer.scan(ProjectScanContainer.java:400) **09:30:30** at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:395) **09:30:30** at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:358) **09:30:30** at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136) **09:30:30** at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122) **09:30:30** at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart(GlobalContainer.java:141) **09:30:30** at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136) **09:30:30** at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122) **09:30:30** at org.sonar.batch.bootstrapper.Batch.doExecute(Batch.java:73) **09:30:30** at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:67) **09:30:30** at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute(BatchIsolatedLauncher.java:46) **09:30:30** at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) **09:30:30** at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) **09:30:30** at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) **09:30:30** at java.base/java.lang.reflect.Method.invoke(Unknown Source) **09:30:30** at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60) **09:30:30** at com.sun.proxy.$Proxy0.execute(Unknown Source) **09:30:30** at org.sonarsource.scanner.api.EmbeddedScanner.doExecute(EmbeddedScanner.java:185) **09:30:30** at org.sonarsource.scanner.api.EmbeddedScanner.execute(EmbeddedScanner.java:137) **09:30:30** at org.sonarsource.scanner.cli.Main.execute(Main.java:112) **09:30:30** at org.sonarsource.scanner.cli.Main.execute(Main.java:75) **09:30:30** at org.sonarsource.scanner.cli.Main.main(Main.java:61) I don’t get much info from a similar report - but see that it should be possible > [@Uncovered Conditions coverage with gcov](https://community.sonarsource.com/t/uncovered-conditions-coverage-with-gcov/9950): > > I’ve successfully generated gcov output and uploaded them to SonarCloud for my C++ project. However, the “Uncovered Conditions” shown in SonarCloud is not working (always shows - for every part of my source code). I was wondering what I need to do in order to enable this functionality? Currently, I am passing these flags to gcov: -a -b -c -f -u -p -l. This should enable branch coverage in the gcov output, as far as I can tell from gcov -help Thank you ---
**Author:** ![peter.toft](https://avatars.discourse-cdn.com/v4/letter/p/58956e/32.png) [@peter.toft](https://community.sonarsource.com/u/peter.toft)\ **Post date:** [August 14, 2019, 7:40am UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100/2 "2019-08-14T07:40:42Z")
make can generate demo.gcov and sonarqube.sh can integrate to SonarQube - but I presumabe that the Makefile line 4 is not generating the format that SonarQube expects. More options needed?? ---
**Author:** ![mpaladin](https://dub1.discourse-cdn.com/sonarsource/user_avatar/community.sonarsource.com/mpaladin/32/118_2.png) [@mpaladin](https://community.sonarsource.com/u/mpaladin)\ **Post date:** [August 14, 2019, 10:05am UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100/3 "2019-08-14T10:05:43Z")
Hi @peter.toft, could you please share the entire sonar-scanner log? ---
**Author:** ![peter.toft](https://avatars.discourse-cdn.com/v4/letter/p/58956e/32.png) [@peter.toft](https://community.sonarsource.com/u/peter.toft)\ **Post date:** [August 14, 2019, 12:07pm UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100/4 "2019-08-14T12:07:18Z")
``` $ ./sonarqube.sh rm -f demo *.gcov *.gc* --2019-08-14 14:04:30-- http://localhost:8082/sonarqube/static/cpp/build-wrapper-linux-x86.zip Resolving localhost (localhost)... 127.0.0.1 Connecting to localhost (localhost)|127.0.0.1|:8082... connected. HTTP request sent, awaiting response... 200 Length: unspecified [application/zip] Saving to: ‘build-wrapper-linux-x86.zip’ 0K .......... .......... .......... .......... .......... 148M 50K .......... .......... .......... .......... .......... 182M 100K .......... .......... .......... .......... .......... 230M 150K .......... .......... .......... .......... .......... 222M 200K .......... .......... .......... .......... .......... 216M 250K .......... .......... .......... .......... .......... 147M 300K .......... .......... .......... .......... ...... 116M=0.002s 2019-08-14 14:04:30 (171 MB/s) - ‘build-wrapper-linux-x86.zip’ saved [354997] Archive: build-wrapper-linux-x86.zip creating: build-wrapper-linux-x86/ inflating: build-wrapper-linux-x86/build-wrapper-linux-x86-64 inflating: build-wrapper-linux-x86/libinterceptor-i686.so inflating: build-wrapper-linux-x86/libinterceptor-x86_64.so rm -f demo *.gcov *.gc* gcc -o demo main.c ext_fct.c -g --coverage -fprofile-arcs -ftest-coverage ./demo I am not so negative any more gcovr -o demo -o demo.gcov INFO: Scanner configuration file: /usr/local/src/sonar-scanner-4.0.0.1744-linux/conf/sonar-scanner.properties INFO: Project root configuration file: NONE INFO: SonarQube Scanner 4.0.0.1744 INFO: Java 11.0.3 AdoptOpenJDK (64-bit) INFO: Linux 4.15.0-1043-aws amd64 INFO: User cache: /var/lib/jenkins/.sonar/cache INFO: SonarQube server 7.9.0 INFO: Default locale: "en", source code encoding: "UTF-8" (analysis is platform dependent) INFO: Load global settings INFO: Load global settings (done) | time=106ms INFO: Server id: BF41A1F2-AWvA4nUDPMYzph8vLIYs INFO: User cache: /var/lib/jenkins/.sonar/cache INFO: Load/download plugins INFO: Load plugins index INFO: Load plugins index (done) | time=43ms INFO: Load/download plugins (done) | time=164ms INFO: Loaded core extensions: developer-scanner INFO: Process project properties INFO: Execute project builders INFO: Execute project builders (done) | time=4ms INFO: Project key: democode INFO: Base dir: /var/lib/jenkins/workspace/ddsp_democode INFO: Working dir: /var/lib/jenkins/workspace/ddsp_democode/.scannerwork INFO: Load project settings for component key: 'democode' INFO: Load project settings for component key: 'democode' (done) | time=96ms INFO: Load project branches INFO: Load project branches (done) | time=14ms INFO: Load project pull requests INFO: Load project pull requests (done) | time=9ms INFO: Load branch configuration INFO: Load branch configuration (done) | time=1ms INFO: Load quality profiles INFO: Load quality profiles (done) | time=100ms INFO: Detected Jenkins INFO: Load active rules INFO: Load active rules (done) | time=4938ms INFO: Indexing files... INFO: Project configuration: INFO: 17 files indexed INFO: 0 files ignored because of scm ignore settings INFO: Quality profile for c: Sonar way INFO: ------------- Run sensors on module democode INFO: Load metrics repository INFO: Load metrics repository (done) | time=58ms WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by net.sf.cglib.core.ReflectUtils$1 (file:/var/lib/jenkins/.sonar/cache/a89f1943fc75b65becd9fb4ecab8d913/sonar-tsql-plugin.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) WARNING: Please consider reporting this to the maintainers of net.sf.cglib.core.ReflectUtils$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release INFO: Sensor JavaXmlSensor [java] INFO: Sensor JavaXmlSensor [java] (done) | time=2ms INFO: Sensor HTML [web] INFO: Sensor HTML [web] (done) | time=11ms INFO: Sensor gcov [cpp] INFO: Parsing /var/lib/jenkins/workspace/ddsp_democode/./demo.gcov INFO: ------------------------------------------------------------------------ INFO: EXECUTION FAILURE INFO: ------------------------------------------------------------------------ INFO: Total time: 9.417s INFO: Final Memory: 21M/80M INFO: ------------------------------------------------------------------------ ERROR: Error during SonarQube Scanner execution java.lang.NullPointerException at org.sonar.api.batch.fs.internal.DefaultFilePredicates.is(DefaultFilePredicates.java:135) at com.sonar.cpp.plugin.gcov.GcovSensor.lambda$execute$2(GcovSensor.java:56) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(Unknown Source) at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) at java.base/java.util.stream.ReferencePipeline$2$1.accept(Unknown Source) at java.base/java.util.Iterator.forEachRemaining(Unknown Source) at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source) at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown Source) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown Source) at java.base/java.util.stream.AbstractPipeline.evaluate(Unknown Source) at java.base/java.util.stream.ReferencePipeline.forEach(Unknown Source) at com.sonar.cpp.plugin.gcov.GcovSensor.scan(GcovSensor.java:75) at com.sonar.cpp.plugin.gcov.GcovSensor.execute(GcovSensor.java:52) at org.sonar.scanner.sensor.AbstractSensorWrapper.analyse(AbstractSensorWrapper.java:48) at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:85) at org.sonar.scanner.sensor.ModuleSensorsExecutor.lambda$execute$1(ModuleSensorsExecutor.java:59) at org.sonar.scanner.sensor.ModuleSensorsExecutor.withModuleStrategy(ModuleSensorsExecutor.java:77) at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:59) at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:82) at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136) at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122) at org.sonar.scanner.scan.ProjectScanContainer.scan(ProjectScanContainer.java:400) at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:395) at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:358) at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136) at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122) at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart(GlobalContainer.java:141) at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136) at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122) at org.sonar.batch.bootstrapper.Batch.doExecute(Batch.java:73) at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:67) at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute(BatchIsolatedLauncher.java:46) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60) at com.sun.proxy.$Proxy0.execute(Unknown Source) at org.sonarsource.scanner.api.EmbeddedScanner.doExecute(EmbeddedScanner.java:185) at org.sonarsource.scanner.api.EmbeddedScanner.execute(EmbeddedScanner.java:137) at org.sonarsource.scanner.cli.Main.execute(Main.java:112) at org.sonarsource.scanner.cli.Main.execute(Main.java:75) at org.sonarsource.scanner.cli.Main.main(Main.java:61) ERROR: ``` ---
**Author:** ![peter.toft](https://avatars.discourse-cdn.com/v4/letter/p/58956e/32.png) [@peter.toft](https://community.sonarsource.com/u/peter.toft)\ **Post date:** [August 14, 2019, 12:08pm UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100/5 "2019-08-14T12:08:08Z")
@mpaladin let me know if you need more ---
**Author:** ![mpaladin](https://dub1.discourse-cdn.com/sonarsource/user_avatar/community.sonarsource.com/mpaladin/32/118_2.png) [@mpaladin](https://community.sonarsource.com/u/mpaladin)\ **Post date:** [August 14, 2019, 12:09pm UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100/6 "2019-08-14T12:09:41Z")
Hi @peter.toft, > [@peter.toft](#): > > INFO: Parsing /var/lib/jenkins/workspace/ddsp\_democode/./demo.gcov Could you share `demo.gcov` file? ---
**Author:** ![peter.toft](https://avatars.discourse-cdn.com/v4/letter/p/58956e/32.png) [@peter.toft](https://community.sonarsource.com/u/peter.toft)\ **Post date:** [August 14, 2019, 12:28pm UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100/7 "2019-08-14T12:28:22Z")
demo.gcov -\> ``` ------------------------------------------------------------------------------ GCC Code Coverage Report Directory: . ------------------------------------------------------------------------------ File Lines Exec Cover Missing ------------------------------------------------------------------------------ ext_fct.c 5 4 80% 6 main.c 5 4 80% 8 ------------------------------------------------------------------------------ TOTAL 10 8 80% ------------------------------------------------------------------------------ ``` ---
**Author:** ![mpaladin](https://dub1.discourse-cdn.com/sonarsource/user_avatar/community.sonarsource.com/mpaladin/32/118_2.png) [@mpaladin](https://community.sonarsource.com/u/mpaladin)\ **Post date:** [August 14, 2019, 12:52pm UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100/8 "2019-08-14T12:52:58Z")
Hi @peter.toft, you need to generate the coverage reports using `gcov`, not `gcovr`, as you can see in your `demo.gcov` you get only a summary. You need to call `gcov` for each of the source file, you can find many tutorial explaining how to generate gcov reports. ---
**Author:** ![peter.toft](https://avatars.discourse-cdn.com/v4/letter/p/58956e/32.png) [@peter.toft](https://community.sonarsource.com/u/peter.toft)\ **Post date:** [August 14, 2019, 1:57pm UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100/9 "2019-08-14T13:57:57Z")
THANX a mil @mpaladin - I am on the right path now! ---
**Author:** ![peter.toft](https://avatars.discourse-cdn.com/v4/letter/p/58956e/32.png) [@peter.toft](https://community.sonarsource.com/u/peter.toft)\ **Post date:** [August 15, 2019, 7:31am UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100/10 "2019-08-15T07:31:43Z")
@mpaladin and others - if adding cmake on top of this it becomes nasty (see e.g. [https://stackoverflow.com/questions/13116488/detailed-guide-on-using-gcov-with-cmake-cdash](https://stackoverflow.com/questions/13116488/detailed-guide-on-using-gcov-with-cmake-cdash)), however gcovr has an option -k that can be added which keeps the indivitual .gcov files, needed for SonarQube. This is a very fast way though and it now plays with SonarQube - I used [https://github.com/bilke/cmake-modules/blob/master/CodeCoverage.cmake](https://github.com/bilke/cmake-modules/blob/master/CodeCoverage.cmake) with the “-k” addition. Thanx for the help!! ---
**Author:** ![elehcim](https://dub1.discourse-cdn.com/sonarsource/user_avatar/community.sonarsource.com/elehcim/32/34100_2.png) [@elehcim](https://community.sonarsource.com/u/elehcim)\ **Post date:** [June 10, 2022, 2:11pm UTC](https://community.sonarsource.com/t/gcov-coverage-analysis-for-c-c-code-on-linux/13100/11 "2022-06-10T14:11:37Z")
I’d like to mention that as written here: [GitHub - sonarsource-cfamily-examples/linux-cmake-gcovr-gh-actions-sc: An example C++ repository built with CMake on Linux using GitHub Actions and analyzed on SonarCloud (test coverage by gcovr)](https://github.com/sonarsource-cfamily-examples/linux-cmake-gcovr-gh-actions-sc) there is a `--sonarqube` flag to `gcovr` creating compatible coverage file for SonarQube