[CMake] CTest misses out with code coverage on files whose path is outside PROJECT_SOURCE_DIR

[Wojciech Migda]

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Hi,

I have found a strange behaviour of ctest when performing code
coverage analysis for unit tests. When the unit test binary is linked
with a static library compiled from source files located outside the
PROJECT_SOURCE_DIR then although the *.gcov files are generated, they
are missed out from the final xml file.

LastCoverage_*.log from the Testing/Temporary folder contains the an
error of a form:

  Errors:
  Something went wrong. Cannot find file:
/home/scr/code_coverage/src_B/src_B.c in source dir:
/home/scr/code_coverage/dir_A or binary dir: /home/scr/code_c
overage/dir_A

Coverage.xml will then contain data for src_A library, but not for src_B.

If I make a symbolic link to src_B within dir_A (where top-level
CMakeLists.txt is located) then the code coverage will be summarized
for src_B as well.

Should I submit a bug ?

Tarball with an example is attached.

With best regards,

Wojtek
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