From: Lucas De Marchi <lucas.demarchi@intel.com>
Date: Mon, 26 Jan 2015 01:28:46 +0000 (-0200)
Subject: build: enable LTO and _FORTIFY_SOURCE with optimization
X-Git-Tag: v20~64
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=27bcc9111b63e94d091c3fa47e81fe52b806cd3e;p=thirdparty%2Fkmod.git

build: enable LTO and _FORTIFY_SOURCE with optimization

If building with optimization enabled, enable LTO.
---

diff --git a/configure.ac b/configure.ac
index 648ff127..e7bab61b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -226,8 +226,18 @@ CC_CHECK_FLAGS_APPEND(with_cflags, [CFLAGS], [\
 		       -fvisibility=hidden \
 		       -ffunction-sections \
 		       -fdata-sections])
-AC_SUBST([OUR_CFLAGS], "$with_cflags $with_coverage_cflags")
 
+AS_CASE([$CFLAGS], [*-O[[12345\ ]]*],
+	[CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
+	 -flto -ffat-lto-objects])],
+	[AC_MSG_RESULT([skipping -flto, optimization not enabled])])
+
+AS_CASE([$CFLAGS], [*-O[[12345\ ]]*],
+        [CC_CHECK_FLAGS_APPEND([with_cppflags], [CPPFLAGS], [\
+               -Wp,-D_FORTIFY_SOURCE=2])],
+        [AC_MSG_RESULT([skipping -D_FORTIFY_SOURCE, optimization not enabled])])
+
+AC_SUBST([OUR_CFLAGS], "$with_cflags $with_coverage_cflags")
 
 CC_CHECK_FLAGS_APPEND([with_ldflags], [LDFLAGS], [ \
 		       -Wl,--as-needed \