[libgpiod v2][PATCH 3/4] build: add a configure option for enabling gcov profiling

[Bartosz Golaszewski <brgl@xxxxxxxx>]

Add a configure switch that adds the relevant gcov options to the
compiler flags for the core library and tests.

Signed-off-by: Bartosz Golaszewski <brgl@xxxxxxxx>
---
 .gitignore        |  4 ++++
 configure.ac      | 10 ++++++++++
 lib/Makefile.am   |  1 +
 tests/Makefile.am |  1 +
 4 files changed, 16 insertions(+)

diff --git a/.gitignore b/.gitignore
index 2d7cc7f..58e1c5f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,3 +29,7 @@ libtool
 *-libtool
 m4/
 stamp-h1
+
+# profiling
+*.gcda
+*.gcno
diff --git a/configure.ac b/configure.ac
index 8e74104..dc09d70 100644
--- a/configure.ac
+++ b/configure.ac
@@ -122,6 +122,16 @@ AC_ARG_ENABLE([tests],
 	[with_tests=false])
 AM_CONDITIONAL([WITH_TESTS], [test "x$with_tests" = xtrue])
 
+AC_ARG_ENABLE([profiling],
+	[AS_HELP_STRING([--enable-profiling],
+		[enable gcov profiling on the core library and tests [default=no]])],
+	[if test "x$enableval" = xyes; then with_profiling=true; fi],
+	[with_profiling=false])
+if test "x$with_profiling" = xtrue
+then
+	AC_SUBST(PROFILING_FLAGS, ["-fprofile-arcs -ftest-coverage"])
+fi
+
 AC_DEFUN([FUNC_NOT_FOUND_TESTS],
 	[ERR_NOT_FOUND([$1()], [tests])])
 
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 5423f72..5219855 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -17,6 +17,7 @@ libgpiod_la_SOURCES =	chip.c \
 libgpiod_la_CFLAGS = -Wall -Wextra -g -std=gnu89
 libgpiod_la_CFLAGS += -fvisibility=hidden -I$(top_srcdir)/include/
 libgpiod_la_CFLAGS += -include $(top_builddir)/config.h
+libgpiod_la_CFLAGS += $(PROFILING_FLAGS)
 libgpiod_la_LDFLAGS = -version-info $(subst .,:,$(ABI_VERSION))
 
 pkgconfigdir = $(libdir)/pkgconfig
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 7bf5e3f..8ec51e9 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -7,6 +7,7 @@ AM_CFLAGS = -I$(top_srcdir)/include/ -I$(top_srcdir)/tests/gpiosim/
 AM_CFLAGS += -include $(top_builddir)/config.h
 AM_CFLAGS += -Wall -Wextra -g -std=gnu89 $(GLIB_CFLAGS)
 AM_CFLAGS += -DG_LOG_DOMAIN=\"gpiod-test\"
+AM_CFLAGS += $(PROFILING_FLAGS)
 AM_LDFLAGS = -pthread
 LDADD = $(top_builddir)/lib/libgpiod.la
 LDADD += $(top_builddir)/tests/gpiosim/libgpiosim.la
-- 
2.30.1