From b678445901b7fbae3d6d5816305cd3569ad9364a Mon Sep 17 00:00:00 2001
From: Allan Sandfeld Jensen <allan.jensen@theqtcompany.com>
Date: Fri, 27 Feb 2015 12:44:47 +0100
Subject: Fix leaking ISA extensions in LTCG builds

Due to common subexpression elimination instruction set extensions may
leak from the objects where they were enabled when doing link-time
optimizations.

To avoid that this patch disables LTCG/LTO on files built with extra
instruction set extensions.

Change-Id: Ie34ad900be7fb04a0dc4d3562187ee170c183333
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
---
 mkspecs/features/simd.prf | 1 +
 1 file changed, 1 insertion(+)

(limited to 'mkspecs/features')

diff --git a/mkspecs/features/simd.prf b/mkspecs/features/simd.prf
index 7d9eaffafa..700d79a1b5 100644
--- a/mkspecs/features/simd.prf
+++ b/mkspecs/features/simd.prf
@@ -27,6 +27,7 @@ defineTest(addSimdCompiler) {
 
     CONFIG($$1) {
         cflags = $$eval(QMAKE_CFLAGS_$${upname})
+        ltcg: cflags += $$QMAKE_CFLAGS_DISABLE_LTCG
         contains(QT_CPU_FEATURES, $$name) {
             # Default compiler settings include this feature, so just add to SOURCES
             SOURCES += $$eval($$sources_var)
-- 
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