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authorThomas Rast <trast@student.ethz.ch>2009-02-19 12:13:35 +0100
committerJunio C Hamano <gitster@pobox.com>2009-02-20 00:01:57 -0800
commit901c369af52ffcc8c08457fb5b330eab217a9cfb (patch)
treefccd010cd60643028e82e442d5ab93fd204e3a4b /Makefile
parent1b7e543a6e2f156536a3cf227f9da1029bba6265 (diff)
downloadgit-901c369af52ffcc8c08457fb5b330eab217a9cfb.tar.gz
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>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile24
1 files changed, 24 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index b040a96e50..c32881b00b 100644
--- a/Makefile
+++ b/Makefile
@@ -1640,3 +1640,27 @@ check-docs::
check-builtins::
./check-builtins.sh
+### Test suite coverage testing
+#
+.PHONY: coverage coverage-clean coverage-build coverage-report
+
+coverage:
+ $(MAKE) coverage-build
+ $(MAKE) coverage-report
+
+coverage-clean:
+ rm -f *.gcda *.gcno
+
+COVERAGE_CFLAGS = $(CFLAGS) -O0 -ftest-coverage -fprofile-arcs
+COVERAGE_LDFLAGS = $(CFLAGS) -O0 -lgcov
+
+coverage-build: coverage-clean
+ $(MAKE) CFLAGS="$(COVERAGE_CFLAGS)" LDFLAGS="$(COVERAGE_LDFLAGS)" all
+ $(MAKE) CFLAGS="$(COVERAGE_CFLAGS)" LDFLAGS="$(COVERAGE_LDFLAGS)" \
+ -j1 test
+
+coverage-report:
+ gcov -b *.c
+ grep '^function.*called 0 ' *.c.gcov \
+ | sed -e 's/\([^:]*\)\.gcov: *function \([^ ]*\) called.*/\1: \2/' \
+ | tee coverage-untested-functions