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Problem: Coverage option broken with LLVM GCOV
Solution: This is an issue with the imported Autoconf M4 macro package for standardised code coverage builds, i.e. using --enable-code-coverage. The simplest way that I could find is to add a case statement that checks if the output of running `gcov -version` contains the "LLVM" keyword; if that is true then do not link with LIBGCOV as its neither required nor supported when using the GCOV frontend for LLVM; least not on Mac OS X. The case statement would also be the most portable. Moreover, using the "-version" argument instead of "-v" seems to be the best bet as that is supported by the normal GCOV and LLVM GCOV frontend. Upstream candidate - this solution should be improved by Autoconf M4 macro overlords and applied to the upstream M4 package; I could not find a suitable way to detect if LLVM GCOV is being used, except for the solution herein; this should also work on *BSD too.
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@ -143,7 +143,14 @@ AC_DEFUN([AX_CODE_COVERAGE],[
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CODE_COVERAGE_CPPFLAGS="-DNDEBUG"
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CODE_COVERAGE_CFLAGS="-O0 -g -fprofile-arcs -ftest-coverage"
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CODE_COVERAGE_CXXFLAGS="-O0 -g -fprofile-arcs -ftest-coverage"
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CODE_COVERAGE_LDFLAGS="-lgcov"
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dnl Libgcov is not required for the LLVM GCOV frontend
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case "`$GCOV -version`" in
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*LLVM*)
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CODE_COVERAGE_LDFLAGS="";;
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*)
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CODE_COVERAGE_LDFLAGS="-lgcov";;
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esac
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AC_SUBST([CODE_COVERAGE_CPPFLAGS])
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AC_SUBST([CODE_COVERAGE_CFLAGS])
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