Add gcov support to the build

Using gcov it's possible to get a coverage report, that is a break down
of how much the exposed API is exercised by the conformance test suite.

.gitignore

@@ -11,11 +11,13 @@ clutter.pc
 *.o
 *.lo
 *.la
+*.gcov
 ChangeLog*
 clutter/clutter-enum-types.[ch]
 clutter/clutter-marshal.[ch]
 clutter/clutter-version.h
 clutter/stamp-*
+/clutter/gcov-report.txt
 /clutter/clutter-json.h
 /clutter/cogl/cogl/cogl-defines.h
 /clutter/cogl/cogl/*.pc

Makefile.am

@@ -48,3 +48,6 @@ MAINTAINERCLEANFILES = 	\
 	$(NULL)
 
 include $(top_srcdir)/build/autotools/Makefile.am.changelog
+
+gcov:
+	@( cd clutter && $(MAKE) $(AM_MAKEFLAGS) $@ ) || exit $$?

build/autotools/Makefile.am

@@ -5,6 +5,7 @@ EXTRA_DIST = \
 	Makefile.am.marshal	\
 	Makefile.am.enums	\
 	Makefile.am.changelog	\
+	Makefile.am.gcov	\
 	dolt.m4			\
 	introspection.m4	\
 	gtk-doc.m4		\

build/autotools/Makefile.am.gcov

@@ -0,0 +1,33 @@
+if GCOV_ENABLED
+gcov-report.txt: gcov-clean
+	$(QUIET_GEN)(rm -f $@; \
+	echo -e "Test coverage for Clutter:\n" >> $@; \
+	total_covered=0; total_actual=0; \
+	for file in $(filter %.c,$(gcov_sources)); do \
+		gcov -o .libs/$${file/.c/.gcda} $$file > /dev/null; \
+		if test -f $$file.gcov; then \
+			actual=`grep -v ' -:' $$file.gcov | wc -l`; \
+			uncovered=`grep '#####:' $$file.gcov | wc -l`; \
+			covered=$$((actual - uncovered)); \
+			total_covered=$$((total_covered + covered)); \
+			total_actual=$$((total_actual + actual)); \
+			echo -e "$$file:    \t$$covered / $$actual\t($$((($$covered * 100) / $$actual))%)"; \
+		fi \
+	done >> $@; \
+	cd $(abs_srcdir); \
+	echo -e "\nSource lines: $$total_actual\nCovered statements: $$total_covered\nTotal coverage: $$((($$total_covered * 100) / $$total_actual))%" >> $@)
+
+gcov: gcov-report.txt
+	@echo ""; cat gcov-report.txt
+gcov-clean:
+	@find . -name "*.gcda" -o -name "*.gcov" -delete
+else
+gcov-report.txt:
+	@true
+gcov-clean:
+	@true
+gcov:
+	@echo "Need to reconfigure with --enable-gcov"
+endif	# GCOV_ENABLED
+
+.PHONY: gcov gcov-clean gcov-report.txt

clutter/Makefile.am

@@ -41,14 +41,7 @@ AM_CPPFLAGS = \
 	$(CLUTTER_DEBUG_CFLAGS)			\
 	$(NULL)
 
-AM_CFLAGS = $(CLUTTER_CFLAGS) $(MAINTAINER_CFLAGS)
-
-LDADD = \
-	$(CLUTTER_LT_LDFLAGS) \
-	-export-dynamic \
-	-export-symbols-regex "^(clutter|cogl|json).*" \
-	-rpath $(libdir) \
-	$(NULL)
+AM_CFLAGS = $(CLUTTER_CFLAGS) $(MAINTAINER_CFLAGS) $(GCOV_CFLAGS)
 
 # please, keep this sorted alphabetically
 source_h =					\
@@ -220,7 +213,13 @@ libclutter_@CLUTTER_WINSYS@_@CLUTTER_API_VERSION@_la_SOURCES = \
 	$(source_c_priv) \
 	$(source_h_priv)
 
-libclutter_@CLUTTER_WINSYS@_@CLUTTER_API_VERSION@_la_LDFLAGS = $(LDADD)
+libclutter_@CLUTTER_WINSYS@_@CLUTTER_API_VERSION@_la_LDFLAGS = \
+	$(CLUTTER_LT_LDFLAGS) \
+	$(GCOV_LDFLAGS) \
+	-export-dynamic \
+	-export-symbols-regex "^(clutter|cogl|json).*" \
+	-rpath $(libdir) \
+	$(NULL)
 
 lib_LTLIBRARIES = $(CLUTTER_WINSYS_LIB)
 
@@ -322,3 +321,6 @@ typelibs_DATA = $(BUILT_GIRSOURCES:.gir=.typelib)
 
 CLEANFILES += $(BUILT_GIRSOURCES) $(typelibs_DATA)
 endif # HAVE_INTROSPECTION
+
+gcov_sources = $(source_c)
+include $(top_srcdir)/build/autotools/Makefile.am.gcov

configure.ac

@@ -720,6 +720,31 @@ AM_CONDITIONAL(PROFILE, test "x$enable_profile" != "xno")
 AC_SUBST(CLUTTER_PROFILE_CFLAGS)
 AC_SUBST(CLUTTER_PROFILE_LDFLAGS)
 
+dnl === Coverage report =======================================================
+
+AC_PATH_PROG([GCOV], [gcov], [enable_gcov=no])
+
+AC_MSG_CHECKING([whether to build with gcov testing])
+
+AC_ARG_ENABLE([gcov],
+              [AS_HELP_STRING([--enable-gcov],
+                              [Whether to enable coverage testing (requires gcc 
+and gcov)])],
+              [],
+              [enable_gcov=no])
+
+AS_IF([test "x$enable_gcov" = "xyes" && test "x$GCC" = "xyes"],
+      [
+        GCOV_CFLAGS="-g -O0 -fprofile-arcs -ftest-coverage"
+        GCOV_LDFLAGS="-lgcov"
+      ]
+)
+
+AM_CONDITIONAL([GCOV_ENABLED], [test "x$enable_gcov" = "xyes"])
+AC_SUBST([GCOV_CFLAGS])
+AC_SUBST([GCOV_LDFLAGS])
+AC_MSG_RESULT([$enable_gcov])
+
 dnl === Enable strict compiler flags ==========================================
 
 # use strict compiler flags only on development releases
@@ -908,6 +933,7 @@ echo "        Clutter debug level: ${enable_debug}"
 echo "        COGL debug level: ${enable_cogl_debug}"
 echo "        Compiler flags: ${MAINTAINER_CFLAGS}"
 echo "        Profiling enabled: ${enable_profile}"
+echo "        Enable coverage tests: ${enable_gcov}"
 
 # Documentation
 echo ""