clang_coverage_example

clang coverage example

What is this

In this example, we integrate CMake with Clang compiler for generating test coverage report.

The Clang compiler version is 13.0.0, lower version not tested. It ships with llvm-cov command, instead of installing another external tool like gcov or lcov.

The integration of Clang, llvm-cov and CMake, is quite like GCC, gcov, lcov and CMake.

Preparation

Installing Clang 13.0.0. My clang is compiled from source with:

#!/bin/bash

cmake .. \
    -G Ninja \
    -D LLVM_ENABLE_PROJECTS='clang;libcxx;libcxxabi;libunwind;lldb;compiler-rt;lld;polly;openmp' \
    -D CMAKE_BUILD_TYPE=Release \
    -D LLVM_TARGETS_TO_BUILD='X86' \
    -D CMAKE_INSTALL_PREFIX=~/soft/llvm13 \
    -D CMAKE_C_COMPILER=clang \
    -D CMAKE_CXX_COMPILER=clang++ \
    -D LIBCXX_CXX_ABI=libcxxabi \
    ../llvm

Play

mkdir build
cd build
cmake ..
make
make coverage

References

https://clang.llvm.org/docs/SourceBasedCodeCoverage.html

https://llvm.org/docs/CommandGuide/llvm-cov.html