Date: Wed, 10 Nov 2004 17:20:24 -0800 (PST) From: "David O'Brien" <obrien@FreeBSD.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: ports/73797: Be causious compiling with -O2 (use -fno-strict-aliasing) Message-ID: <200411110120.iAB1KORP035262@dragon.nuxi.com> Resent-Message-ID: <200411110130.iAB1UPE8058667@freefall.freebsd.org>
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>Number: 73797
>Category: ports
>Synopsis: Be causious compiling with -O2 (use -fno-strict-aliasing)
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-ports-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Thu Nov 11 01:30:25 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: David O'Brien
>Release: FreeBSD 6.0-CURRENT i386
>Organization:
>Environment:
System: FreeBSD dragon.nuxi.com 6.0-CURRENT FreeBSD 6.0-CURRENT #447: Tue Oct 19 09:53:16 PDT 2004 rootk@dragon.nuxi.com:/FBSD/src/sys/i386/compile/DRAGON i386
>Description:
Compiling with 'strict-aliasing' optimization breaks some [notable]
ports. GCC turns on 'strict-aliasing' optimization at all levels
above -O[1], so explicitly turn it off when using compiling with
"high" optimization levels.
>How-To-Repeat:
Build Firefox and other ports with -O2 (or -Os or -O3).
>Fix:
Index: bsd.port.mk
===================================================================
RCS file: /home/ncvs/ports/Mk/bsd.port.mk,v
retrieving revision 1.499
diff -u -u -7 -r1.499 bsd.port.mk
--- bsd.port.mk 7 Oct 2004 17:59:18 -0000 1.499
+++ bsd.port.mk 11 Nov 2004 01:16:33 -0000
@@ -1222,14 +1223,17 @@
.if defined(WITHOUT_CPU_CFLAGS)
.if defined(_CPUCFLAGS)
.if !empty(_CPUCFLAGS)
CFLAGS:= ${CFLAGS:C/${_CPUCFLAGS}//}
.endif
.endif
.endif
+.if ${CFLAGS:M-O[23s]} != ""
+CFLAGS+= -fno-strict-aliasing
+.endif
.if defined(NOPORTDOCS)
PLIST_SUB+= PORTDOCS="@comment "
.else
PLIST_SUB+= PORTDOCS=""
.endif
>Release-Note:
>Audit-Trail:
>Unformatted:
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