On 01/01/12 10:11, Dimitry Andric wrote:
On 2012-01-01 16:56, Nathan Whitehorn wrote:
Author: nwhitehorn
Date: Sun Jan 1 15:56:15 2012
New Revision: 229169
URL: http://svn.freebsd.org/changeset/base/229169
Log:
Instead of forcing -O1 on PowerPC for LLVM and clang, fix the actual
problem by adding -fno-strict-aliasing to CFLAGS. Since this is a
global
issue that just happened to manifest on PowerPC, add this to CFLAGS
unconditionally.
MFC after: 1 week
Modified:
head/lib/clang/clang.build.mk
Modified: head/lib/clang/clang.build.mk
==============================================================================
--- head/lib/clang/clang.build.mk Sun Jan 1 09:12:21 2012
(r229168)
+++ head/lib/clang/clang.build.mk Sun Jan 1 15:56:15 2012
(r229169)
@@ -8,10 +8,8 @@ CFLAGS+=-I${LLVM_SRCS}/include -I${CLANG
-DLLVM_ON_UNIX -DLLVM_ON_FREEBSD \
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS #-DNDEBUG
-# Correct for gcc miscompilation when compiling on PPC with -O2
-.if ${MACHINE_CPUARCH} == "powerpc"
-CFLAGS+= -O1
-.endif
+# LLVM is not strict aliasing safe as of 12/31/2011
+CFLAGS+= -fno-strict-aliasing
Actually, LLVM is strict-aliasing safe, but not for gcc 4.2.1. :)
There is some sort of problem with gcc's optimizer that made a few LLVM
tests fails mysteriously in the past. At a certain point, these
problems went away for x86, but apparently not for non-x86...
In any case, this option should only have to be added when the compiler
is base gcc.
Ah, interesting. I'm not quite sure how to express "is compiler base
GCC", but I'm guessing you have more experience there. Would you mind
fixing that?
-Nathan
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