Author: nwhitehorn
Date: Mon Aug 15 13:33:14 2011
New Revision: 224882
URL: http://svn.freebsd.org/changeset/base/224882
Log:
Use a maximum of -O on PowerPC kernels instead of -O2 to prevent a rare
bug that could cause intermittent memory corruption on PowerPC SMP
systems using non-debug kernels. This is a temporary change until the
real problem is fixed.
Approved by: re (kib)
Modified:
head/sys/conf/kern.pre.mk
Modified: head/sys/conf/kern.pre.mk
==============================================================================
--- head/sys/conf/kern.pre.mk Mon Aug 15 13:27:02 2011 (r224881)
+++ head/sys/conf/kern.pre.mk Mon Aug 15 13:33:14 2011 (r224882)
@@ -27,8 +27,12 @@ SIZE?= size
_MINUS_O= -O
CTFFLAGS+= -g
.else
+.if ${MACHINE_CPUARCH} == "powerpc"
+_MINUS_O= -O # gcc miscompiles some code at -O2
+.else
_MINUS_O= -O2
.endif
+.endif
.if ${MACHINE_CPUARCH} == "amd64"
COPTFLAGS?=-O2 -frename-registers -pipe
.else
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