Failed to generate C++ Coverage file with bazel on Ubuntu

Question

Description of the problem / feature request:

I am doing some coverage test on bazel-example project, but I failed to get coverage file:

build project with coverage related options

git clone https://github.com/bazelbuild/examples/ bazel_examples

cd bazel_examples/cpp-tutorial/stage1

bazel build -s --copt="-coverage" --linkopt="-lgcov" //main:hello-world

The result shows build command runs successfully, but no coverage files(*.gcno) are generated.

Then I run the binary output, but no runtime coverage files(*.gcda) are generated too.

I am using bazel 3.5.0, gcc 9.4.0, Ubuntu 18.04.5.

Does any one know how to resolve this?

Check man gcc, the option should be named --coverage, with two minus signs. However, bazel coverage should be your go-to tool, it should do the rest for you. — Ulrich Eckhardt
– Ulrich Eckhardt, Commented May 29, 2022 at 17:03

SG_Bazel · Accepted Answer · 2022-05-29 14:54:05Z

1

Did you try checking the coverage by running the below command.

    bazel coverage -s \
  --instrument_test_targets \
  --experimental_cc_coverage \
  --combined_report=lcov \
  --coverage_report_generator=@bazel_tools//tools/test/CoverageOutputGenerator/java/com/google/devtools/coverageoutputgenerator:Main \
  //...

You can find the coverage file here

bazel-out/_coverage/_coverage_report.dat

answered May 29, 2022 at 14:54

SG_Bazel

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