Bug 331641 – sys-devel/gcc-4.{4,5}*: Miscompiled c++ class with packed attribute on ARM with -Os optimizations (Qt 4.6.2)

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Raúl Porcel (RETIRED) 2010-08-08 11:33:19 UTC]

This is just for tracking upstream bug and remind that until qt-4.7 is stable or this is fixed, i'm adding this to the qt4-build.eclass:

--- qt4-build.eclass	11 Jul 2010 10:32:17 -0000	1.78
+++ qt4-build.eclass	8 Aug 2010 11:32:34 -0000
@@ -196,6 +196,12 @@
 		replace-flags -O2 -O3
 	fi
 
+	if [[ ${CHOST} == arm* ]] ; then
+		# Fails on arm with -Os
+		# This can be removed once qt-4.7 is stable or the bug on gcc is fixed
+		replace-flags -Os -O2
+	fi
+
 	# Bug 178652
 	if [[ $(gcc-major-version) == 3 ]] && use amd64; then
 		ewarn "Appending -fno-gcse to CFLAGS/CXXFLAGS"

[Comment 1 Siarhei Siamashka 2010-08-08 12:01:36 UTC]

I'm afraid that just filtering out -Os when compiling Qt libraries may be not enough to solve the issue. Because any Qt/KDE application trying to return QChar from some function may be miscompiled too.

[Comment 2 Ryan Hill (RETIRED) 2010-09-11 04:36:45 UTC]

Created attachment 246793 [details, diff]
70_all_gcc44-pr45070-arm_-Os.patch

[Comment 3 Ryan Hill (RETIRED) 2010-09-11 04:38:10 UTC]

Created attachment 246794 [details, diff]
70_all_gcc45-pr45070-arm_-Os.patch

[Comment 4 Ryan Hill (RETIRED) 2010-09-11 04:42:08 UTC]

Added to 4.4.4 and 4.5.1 patchsets.

[Comment 5 Ryan Hill (RETIRED) 2010-09-16 04:18:36 UTC]

Released in 4.4.4-r2.

[Comment 6 Ryan Hill (RETIRED) 2010-09-16 04:48:57 UTC]

and 4.5.1 (p1.1).