From b850b06e1efcc7e27cfd785759a3a913ac9ed196 Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay@vrfy.org>
Date: Thu, 21 Nov 2013 21:56:18 +0100
Subject: [PATCH] build-sys: enable gcc Link Time Optimization when
 optimization is enabled

---
 configure.ac | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configure.ac b/configure.ac
index 779454196..c0656f4fb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -156,6 +156,10 @@ CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
         -fdata-sections \
         -fstack-protector \
         --param=ssp-buffer-size=4])
+AS_CASE([$CFLAGS], [*-O[[12345\ ]]*],
+        [CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
+               -flto])],
+        [AC_MSG_RESULT([skipping -flto, optimization not enabled])])
 AC_SUBST([OUR_CFLAGS], "$with_cflags $address_sanitizer_cflags")
 
 AS_CASE([$CFLAGS], [*-O[[12345\ ]]*],
-- 
2.30.2