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Support coverage testing with GCC/gcov
With gcc's --coverage option, we can perform automatic coverage data collection for the test suite. Add a new Makefile target 'coverage' that scraps all previous coverage results, recompiles git with the required compiler/linker flags (in addition to any flags you specify manually), then runs the test suite and compiles a report. The compilation must be done with all optimizations disabled, since inlined functions (and for line-by-line coverage, also optimized branches/loops) break coverage tracking. The tests are run serially (with -j1). The coverage code should theoretically allow concurrent access to its data files, but the author saw random test failures. Obviously this could be improved. The report currently consists of a list of functions that were never executed during the tests, which is written to 'coverage-untested-functions'. Once this list becomes reasonably short, we would also want to look at branches that were never taken. Currently only toplevel *.c files are considered. It would be nice to at least include xdiff, but --coverage did not save data to subdirectories on the system used to write this (gcc 4.3.2). Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Makefile
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Makefile
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@ -1640,3 +1640,27 @@ check-docs::
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check-builtins::
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./check-builtins.sh
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### Test suite coverage testing
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#
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.PHONY: coverage coverage-clean coverage-build coverage-report
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coverage:
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$(MAKE) coverage-build
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$(MAKE) coverage-report
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coverage-clean:
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rm -f *.gcda *.gcno
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COVERAGE_CFLAGS = $(CFLAGS) -O0 -ftest-coverage -fprofile-arcs
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COVERAGE_LDFLAGS = $(CFLAGS) -O0 -lgcov
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coverage-build: coverage-clean
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$(MAKE) CFLAGS="$(COVERAGE_CFLAGS)" LDFLAGS="$(COVERAGE_LDFLAGS)" all
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$(MAKE) CFLAGS="$(COVERAGE_CFLAGS)" LDFLAGS="$(COVERAGE_LDFLAGS)" \
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-j1 test
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coverage-report:
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gcov -b *.c
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grep '^function.*called 0 ' *.c.gcov \
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| sed -e 's/\([^:]*\)\.gcov: *function \([^ ]*\) called.*/\1: \2/' \
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| tee coverage-untested-functions
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