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Support coverage testing with GCC/gcov

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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>
This commit is contained in:
Thomas Rast 2009-02-19 12:13:35 +01:00 committed by Junio C Hamano
parent 1b7e543a6e
commit 901c369af5
1 changed files with 24 additions and 0 deletions
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24
Makefile
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@ -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