[RFC v2 BlueZ] build: Add coverage support

[Luiz Augusto von Dentz <luiz.dentz@gmail.com>]

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Coverage is disabled by default but it is automatically enabled by
bootstrap-configure using --enable-coverage, it creates a new make target
'coverage' that can be run after make check or any tester that produces
.gdca files.

The build time using --enable-coverage is considerable bigger so if
that is a problem just disable it, also this is the reason why it is not
added directly under --enable-maintainer-mode so it is possible to
turn off coverage without having to turn off maintainer mode.

Since lcov apparently cannot detect changes to .gcda there is another
make target 'clean-coverage' so after that make coverage can be
run again.
---
 Makefile.am         | 17 +++++++++++++++++
 acinclude.m4        |  8 ++++++++
 bootstrap-configure |  1 +
 configure.ac        |  5 +++++
 4 files changed, 31 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index 15cc149..4b3351a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -331,5 +331,22 @@ lib/bluetooth/%.h: lib/%.h
 	$(AM_V_at)$(MKDIR_P) lib/bluetooth
 	$(AM_V_GEN)$(LN_S) -f "$(abs_top_builddir)"/$< $@
 
+if COVERAGE
+clean-coverage:
+	$(RM) -r coverage
+
+coverage:
+	$(AM_V_at)$(MKDIR_P) -p coverage
+	@lcov --compat-libtool --directory $(top_builddir) --capture \
+					--output-file coverage/check.info
+	@genhtml -o coverage/ coverage/check.info
+
+clean-local: clean-coverage
+	@find $(top_builddir) -name "*.gcda" -exec $(RM) {} \;
+	@find $(top_builddir) -name "*.gcno" -exec $(RM) {} \;
+	@lcov --directory . --zerocounters
+	$(RM) -r lib/bluetooth
+else
 clean-local:
 	$(RM) -r lib/bluetooth
+endif
diff --git a/acinclude.m4 b/acinclude.m4
index 2065852..4bb8bde 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -51,6 +51,14 @@ AC_DEFUN([MISC_FLAGS], [
 			misc_ldflags="$misc_ldflags -pie"
 		fi
 	])
+	AC_ARG_ENABLE(coverage, AC_HELP_STRING([--enable-coverage],
+						[enable coverage flags]), [
+		enable_coverage=${enableval}
+		if (test "${enable_coverage}" = "yes"); then
+			misc_cflags="$misc_cflags --coverage"
+			misc_ldflags="$misc_ldflags --coverage"
+		fi
+	])
 	AC_SUBST([MISC_CFLAGS], $misc_cflags)
 	AC_SUBST([MISC_LDFLAGS], $misc_ldflags)
 ])
diff --git a/bootstrap-configure b/bootstrap-configure
index c7f08ed..35aa98b 100755
--- a/bootstrap-configure
+++ b/bootstrap-configure
@@ -14,4 +14,5 @@ fi
 		--enable-experimental \
 		--enable-android \
 		--enable-sixaxis \
+		--enable-coverage \
 		--disable-datafiles $*
diff --git a/configure.ac b/configure.ac
index 18d0b55..5e684a3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -252,4 +252,9 @@ AC_ARG_ENABLE(android, AC_HELP_STRING([--enable-android],
 					[enable_android=${enableval}])
 AM_CONDITIONAL(ANDROID, test "${enable_android}" = "yes")
 
+if (test "${enable_coverage}" = "yes"); then
+	AC_CHECK_PROG([LCOV], [lcov], [yes], AC_MSG_ERROR(lcov is required))
+fi
+AM_CONDITIONAL([COVERAGE], [test "${enable_coverage}" = "yes"])
+
 AC_OUTPUT(Makefile src/bluetoothd.8 lib/bluez.pc)
-- 
1.8.3.1