From e9b0d1b40e645fd583f090601f4ae2a7926888a1 Mon Sep 17 00:00:00 2001
From: Lucas De Marchi <lucas.demarchi@intel.com>
Date: Wed, 7 Jan 2015 19:17:15 -0200
Subject: [PATCH] build-sys: integrate coverage report

Just pass --enable-coverage to configure and then "make coverage" to
have the coverage report at coverage dir.
---
 .gitignore   |  3 +++
 Makefile.am  | 39 +++++++++++++++++++++++++++++++++++++++
 configure.ac | 25 ++++++++++++++++++++++++-
 3 files changed, 66 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 88c8149..f60cac6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,6 @@
 *.o
+*.gcda
+*.gcno
 /*.tar.xz
 /*.md5sum
 .deps/
@@ -14,6 +16,7 @@
 /config.log
 /config.status
 /configure
+/coverage
 /libtool
 /stamp-h1
 /test-suite.log
diff --git a/Makefile.am b/Makefile.am
index 5df38cb..bf4f328 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -326,6 +326,45 @@ distclean-local: $(DISTCLEAN_LOCAL_HOOKS)
 buildtest-TESTS:
 	$(MAKE) $(AM_MAKEFLAGS) $(check_LTLIBRARIES) $(check_PROGRAMS)
 
+# ------------------------------------------------------------------------------
+# coverage
+# ------------------------------------------------------------------------------
+
+# .PHONY so it always rebuilds it
+.PHONY: coverage lcov-run lcov-report coverage-sync
+
+# run lcov from scratch, always
+coverage: all
+	$(MAKE) lcov-run
+	$(MAKE) lcov-report
+
+coverage_dir = coverage
+coverage_opts = --base-directory $(srcdir) --directory $(builddir) \
+		--rc 'geninfo_adjust_src_path=$(abspath $(srcdir))=>$(abspath $(builddir))'
+
+if ENABLE_COVERAGE
+# reset run coverage tests
+lcov-run:
+	@rm -rf $(coverage_dir)
+	lcov $(coverage_opts) --zerocounters
+	-$(MAKE) check
+
+# generate report based on current coverage data
+lcov-report:
+	$(MKDIR_P) $(coverage_dir)
+	lcov $(coverage_opts) --capture --no-external --ignore-errors graph \
+		| sed 's|$(abspath $(builddir))|$(abspath $(srcdir))|' > $(coverage_dir)/.lcov.info
+	lcov --remove $(coverage_dir)/.lcov.info --output-file $(coverage_dir)/.lcov-clean.info 'test-*'
+	genhtml -t "kmod test coverage" -o $(coverage_dir) $(coverage_dir)/.lcov-clean.info
+	@echo "Coverage report generated in $(abs_builddir)/$(coverage_dir)/index.html"
+
+else
+
+lcov-run lcov-report:
+	echo "Need to reconfigure with --enable-coverage"
+
+endif
+
 # ------------------------------------------------------------------------------
 # custom release helpers
 # ------------------------------------------------------------------------------
diff --git a/configure.ac b/configure.ac
index 3be3198..648ff12 100644
--- a/configure.ac
+++ b/configure.ac
@@ -151,6 +151,28 @@ AS_IF([test "x$enable_python" = "xyes"], [
 ])
 AM_CONDITIONAL([BUILD_PYTHON], [test "x$enable_python" = "xyes"])
 
+AC_ARG_ENABLE([coverage],
+	AS_HELP_STRING([--enable-coverage], [enable test coverage @<:@default=disabled@:>@]),
+	[], [enable_coverage=no])
+AS_IF([test "x$enable_coverage" = "xyes"], [
+	AC_CHECK_PROG(have_coverage, [lcov], [yes], [no])
+	AS_IF([test "x$have_coverage" = xno],[
+		AC_MSG_ERROR([*** lcov support requested but the program was not found])
+	], [
+		lcov_version_major="`lcov --version | cut -d ' ' -f 4 | cut -d '.' -f 1`"
+		lcov_version_minor="`lcov --version | cut -d ' ' -f 4 | cut -d '.' -f 2`"
+		AS_IF([test "$lcov_version_major" -lt 1 -o "$lcov_version_minor" -lt 10], [
+			AC_MSG_ERROR([*** lcov version is too old. 1.10 required])
+		], [
+			have_coverage=yes
+                        CC_CHECK_FLAGS_APPEND([with_coverage_cflags], [CFLAGS], [\
+                        -fprofile-arcs \
+                        -ftest-coverage])
+		])
+        ])
+])
+AM_CONDITIONAL([ENABLE_COVERAGE], [test "x$enable_coverage" = "xyes"])
+
 m4_ifdef([GTK_DOC_CHECK], [
 GTK_DOC_CHECK([1.14],[--flavour no-tmpl-flat])
 ], [
@@ -204,7 +226,7 @@ CC_CHECK_FLAGS_APPEND(with_cflags, [CFLAGS], [\
 		       -fvisibility=hidden \
 		       -ffunction-sections \
 		       -fdata-sections])
-AC_SUBST([OUR_CFLAGS], $with_cflags)
+AC_SUBST([OUR_CFLAGS], "$with_cflags $with_coverage_cflags")
 
 
 CC_CHECK_FLAGS_APPEND([with_ldflags], [LDFLAGS], [ \
@@ -249,6 +271,7 @@ AC_MSG_RESULT([
 	logging:		${enable_logging}
 	compression:		xz=${with_xz}  zlib=${with_zlib}
 	debug:			${enable_debug}
+	coverage:		${enable_coverage}
 	doc:			${enable_gtk_doc}
 	man:			${enable_manpages}
 ])