Add a workaround for gcov-based coverage with clang #5040
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- Allow overriding the gcov tool with the GCOV env variable in cc_configure - Symlink the GCOV tool in collect-coverage.sh to a temporary location with the name "gcov" This allows the user to specify GCOV=llvm-cov in the environment of a bazel build, which then leads to cc_configure picking up llvm-cov in the crosstool, which the collect-coverage.sh script then uses as "gcov". On linux distributions, the gcov tool does not generally work with clang coverage output, so this provides at least a workaround for running coverage with clang (by setting the GCOV env variable).
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the name "gcov"
This allows the user to specify GCOV=llvm-cov in the environment of a bazel
build, which then leads to cc_configure picking up llvm-cov in the crosstool,
which the collect-coverage.sh script then uses as "gcov".
On linux distributions, the gcov tool does not generally work with clang
coverage output, so this provides at least a workaround for running coverage
with clang (by setting the GCOV env variable).