Hook up gcov for coverage reports

./configure --enable-gcov adds the required flags to link everything ready for
gcov. A new make gcov target runs the test suite, then pulls all the gcov bits
together into ./test/gcov-reports/ including a summary file.

The script to pull everything out is used in libevdev too, we just have an
extra condition here to ignore the selftest gcov bits (it overwrites the
useful litest.c coverage output).

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

Makefile.am

@@ -6,3 +6,6 @@ valgrind:
 	(cd test; $(MAKE) valgrind)
 
 AM_DISTCHECK_CONFIGURE_FLAGS = --disable-test-run
+
+gcov:
+	(cd test; $(MAKE) gcov)

configure.ac

@@ -262,6 +262,26 @@ AM_CONDITIONAL(BUILD_DOCS, [test "x$build_documentation" = "xyes"])
 AM_CONDITIONAL(HAVE_LIBUNWIND, [test "x$HAVE_LIBUNWIND" = xyes])
 AM_CONDITIONAL(BUILD_EVENTGUI, [test "x$build_eventgui" = "xyes"])
 
+#######################
+# enable/disable gcov #
+#######################
+
+AC_ARG_ENABLE([gcov],
+              [AS_HELP_STRING([--enable-gcov],
+                              [Enable to enable coverage testing (default:disabled)])],
+	      [enable_gcov="$enableval"],
+              [enable_gcov=no])
+if test "x$enable_gcov" != "xno"; then
+       GCOV_CFLAGS="-fprofile-arcs -ftest-coverage"
+       GCOV_LDFLAGS="-fprofile-arcs -ftest-coverage"
+       enable_gcov=yes
+fi
+
+AM_CONDITIONAL([GCOV_ENABLED], [test "x$enable_gcov" != "xno"])
+AC_SUBST([GCOV_CFLAGS])
+AC_SUBST([GCOV_LDFLAGS])
+
+
 AC_CONFIG_FILES([Makefile
 		 doc/Makefile
 		 doc/libinput.doxygen
@@ -288,4 +308,5 @@ AC_MSG_RESULT([
 	Tests use valgrind	${VALGRIND}
 	Tests use libunwind	${HAVE_LIBUNWIND}
 	Build GUI event tool	${build_eventgui}
+	Enable gcov profiling	${enable_gcov}
 	])

src/Makefile.am

@@ -39,13 +39,17 @@ libinput_la_LIBADD = $(MTDEV_LIBS) \
 		     $(LIBEVDEV_LIBS) \
 		     $(LIBWACOM_LIBS) \
 		     libinput-util.la
+libinput_la_LDFLAGS = $(GCOV_LDFLAGS) \
+		      -version-info $(LIBINPUT_LT_VERSION) -shared \
+		      -Wl,--version-script=$(srcdir)/libinput.sym
 
 libinput_la_CFLAGS = -I$(top_srcdir)/include \
 		     $(MTDEV_CFLAGS)	\
 		     $(LIBUDEV_CFLAGS)	\
 		     $(LIBEVDEV_CFLAGS)	\
 		     $(LIBWACOM_CFLAGS) \
-		     $(GCC_CFLAGS)
+		     $(GCC_CFLAGS) \
+		     $(GCOV_CFLAGS)
 EXTRA_libinput_la_DEPENDENCIES = $(srcdir)/libinput.sym
 
 libinput_util_la_SOURCES = \
@@ -53,9 +57,11 @@ libinput_util_la_SOURCES = \
 	libinput-util.h
 
 libinput_util_la_LIBADD =
+libinput_util_la_LDFLAGS = $(GCOV_LDFLAGS)
 libinput_util_la_CFLAGS = -I$(top_srcdir)/include \
 			  $(LIBUDEV_CFLAGS) \
-			  $(GCC_CFLAGS)
+			  $(GCC_CFLAGS) \
+			  $(GCOV_CFLAGS)
 
 libfilter_la_SOURCES = \
 	filter.c \
@@ -64,9 +70,6 @@ libfilter_la_SOURCES = \
 libfilter_la_LIBADD =
 libfilter_la_CFLAGS =
 
-libinput_la_LDFLAGS = -version-info $(LIBINPUT_LT_VERSION) -shared \
-		      -Wl,--version-script=$(srcdir)/libinput.sym
-
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libinput.pc
 

test/Makefile.am

@@ -6,7 +6,7 @@ AM_CPPFLAGS = -I$(top_srcdir)/include \
               $(LIBUDEV_CFLAGS) \
               -I$(top_builddir)/src # for libinput-version.h
 
-AM_CFLAGS = $(GCC_CFLAGS)
+AM_CFLAGS = $(GCC_CFLAGS) $(GCOV_CFLAGS)
 AM_CXXFLAGS = $(GCC_CXXFLAGS)
 
 TEST_LIBS = liblitest.la $(CHECK_LIBS) $(LIBUDEV_LIBS) $(LIBEVDEV_LIBS) $(top_builddir)/src/libinput.la
@@ -163,3 +163,14 @@ DISTCLEANFILES=test-suite-valgrind.log
 endif
 endif
 EXTRA_DIST=valgrind.suppressions
+
+if GCOV_ENABLED
+
+CLEANFILES = gcov-reports/*.gcov gcov-reports/summary.txt *.gcno *.gcda
+
+gcov: generate-gcov-report.sh check-TESTS
+	$(AM_V_GEN)$(srcdir)/generate-gcov-report.sh gcov-reports $(top_builddir)/src $(builddir)
+else
+gcov:
+	@echo "Run ./configure --enable-gcov to produce gcov reports" && false
+endif

test/generate-gcov-report.sh

@@ -0,0 +1,42 @@
+#!/bin/bash -e
+
+if [[ $# -lt 2 ]]; then
+    echo "Usage: ./generate-gcov-report.sh <rel-target-dir> <srcdir> [<srcdir> ... ]"
+    exit 1
+fi
+
+target_dir=$1
+shift
+source_dirs=$*
+
+if [[ "${target_dir:0:1}" != '/' ]]; then
+    target_dir="$PWD/$target_dir"
+fi
+summary_file="$target_dir/summary.txt"
+
+mkdir -p "$target_dir"
+rm -f "$target_dir"/*.gcov
+
+for dir in $source_dirs; do
+	pushd "$dir" > /dev/null
+	for file in *.c; do
+		find ./ -name "*${file/\.c/.gcda}" \
+			\!  -path "*selftest*" \
+			-exec gcov {} \; > /dev/null
+	done
+	find ./ -name "*.gcov" \
+		\! -path "*/`basename "$target_dir"`/*" \
+		-exec mv {} "$target_dir" \;
+	popd > /dev/null
+done
+
+echo "========== coverage report ========" > "$summary_file"
+for file in "$target_dir"/*.gcov; do
+	total=`grep -v " -:" "$file" | wc -l`
+	missing=`grep "#####" "$file" | wc -l`
+	hit=$((total - missing));
+	percent=$((($hit * 100)/$total))
+	fname=`basename "$file"`
+	printf "%-50s total lines: %4s not tested: %4s (%3s%%)\n" "$fname" "$total" "$missing" "$percent">> "$summary_file"
+done
+echo "========== =============== ========" >> "$summary_file"