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Code coverage
=============
Documentation:
https://gcc.gnu.org/onlinedocs/gcc/Invoking-Gcov.html
http://ltp.sourceforge.net/coverage/lcov.php
https://wiki.documentfoundation.org/Development/Lcov
https://linux.die.net/man/1/lcov
0. Use lcov 1.12 or newer.
Make sure that /etc/lcovrc or your ~/.lcovrc contains
geninfo_auto_base = 1
(Without it, you get many more warnings in step 4.)
1. Configure in source directory (no VPATH build) with
$ ./configure CC="gcc --coverage" CPPFLAGS=-Wall
Why in the source directory?
Because in a VPATH build, there are more files that create trouble in
steps 4 and 5 (po-gram-gen.[yc], cldr-plurals.[yc], and more).
2. Compile:
$ make
This step creates many *.gcno files.
3. Run:
$ rm -f `find . -name '*.gcda'`
$ make check
This step creates many *.gcda files.
4. $ lcov --capture --directory . --output-file coverage.info
You get warnings about
c-ctype.h ostream.h ostream.oo.h styled-ostream.h term-ostream.h unistr.h xalloc.h
plural.c plural.y
Handle them by making symlinks:
$ for f in c-ctype.h ostream.h ostream.oo.h styled-ostream.h term-ostream.h unistr.h xalloc.h; do
ln -sf ../gnulib-lib/$f gettext-tools/src/$f
done
$ for f in plural.c plural.y; do
ln -sf ../../gettext-runtime/intl/$f gettext-tools/intl/$f
ln -sf ../../gettext-runtime/intl/$f gettext-tools/src/$f
done
5. $ genhtml coverage.info --output-directory lcov.out
6. $ xdg-open lcov.out/index.html
7. When done:
$ rm -f `find . -name '*.gcno'` `find . -name '*.gcda'`
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