nixpkgs/pkgs/build-support/setup-hooks/enable-coverage-instrumentation.sh

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postPhases+=" cleanupBuildDir"
# Force GCC to build with coverage instrumentation. Also disable
# optimisation, since it may confuse things.
export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -O0 --coverage"
# FIXME: Handle the case where postUnpack is already set.
postUnpack() {
# This is an uberhack to prevent libtool from remoaving gcno
# files. This has been fixed in libtool, but there are packages
# out there with old ltmain.sh scripts. See
# http://www.mail-archive.com/libtool@gnu.org/msg10725.html
for i in $(find -name ltmain.sh); do
substituteInPlace $i --replace '*.$objext)' '*.$objext | *.gcno)'
done
}
# Get rid of everything that isn't a gcno file or a C source file.
# Also strip the `.tmp_' prefix from gcno files. (The Linux kernel
# creates these.)
cleanupBuildDir() {
if ! [ -e $out/.build ]; then return; fi
find $out/.build/ -type f -a ! \
\( -name "*.c" -o -name "*.cc" -o -name "*.cpp" -o -name "*.h" -o -name "*.hh" -o -name "*.y" -o -name "*.l" -o -name "*.gcno" \) \
| xargs rm -f --
for i in $(find $out/.build/ -name ".tmp_*.gcno"); do
mv "$i" "$(echo $i | sed s/.tmp_//)"
done
}