RE: [Xen-devel] Build failure on i386 fedora core 4

["Kamble, Nitin A" <nitin.a.kamble@xxxxxxxxx>]

I am fine with the new patch.

Interestingly this issue is not present on x86_64 FC4. Gcc versions are
different for FC4 on these architectures.


FC4 I386:
gcc (GCC) 4.0.1 20050727 (Red Hat 4.0.1-5)

FC4 X86_64:
gcc (GCC) 4.0.0 20050519 (Red Hat 4.0.0-8)

Thanks & Regards,
Nitin
------------------------------------------------------------------------
-----------
Open Source Technology Center, Intel Corp

>-----Original Message-----
>From: Vincent Hanquez [mailto:vincent.hanquez@xxxxxxxxxxxx]
>Sent: Monday, January 30, 2006 2:38 PM
>To: Kamble, Nitin A
>Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-devel] Build failure on i386 fedora core 4
>
>On Mon, Jan 30, 2006 at 01:52:07PM -0800, Kamble, Nitin A wrote:
>> I am observing xen-unstable build failing on i386 FC4, as seen
bellow.
>> mm.c:1975: warning: ?mapcache.pfn? may be used uninitialized in this
>> function
>>
>> mm.c:1975: warning: ?mapcache.va? may be used uninitialized in this
>> function
>
>that's a bogus gcc4 warning. the variable is fine and not used
>uninitialized, i checked.
>
>I think just not using -Werror for gcc4 is a much better alternative,
cf
>following patch.
>
>diff -r 690fc13948db xen/arch/x86/Rules.mk
>--- a/xen/arch/x86/Rules.mk    Mon Jan 30 13:35:43 2006 +0100
>+++ b/xen/arch/x86/Rules.mk    Mon Jan 30 22:40:33 2006 +0000
>@@ -8,7 +8,7 @@
> pae ?= n
>
> CFLAGS  += -nostdinc -fno-builtin -fno-common -fno-strict-aliasing
>-CFLAGS  += -iwithprefix include -Wall -Werror -Wno-pointer-arith -pipe
>+CFLAGS  += -iwithprefix include -Wall -Wno-pointer-arith -pipe
> CFLAGS  += -I$(BASEDIR)/include
> CFLAGS  += -I$(BASEDIR)/include/asm-x86/mach-generic
> CFLAGS  += -I$(BASEDIR)/include/asm-x86/mach-default
>@@ -55,3 +55,7 @@
> $(error gcc-3.1.x unsupported - upgrade to at least gcc-3.2.x)
> endif
> endif
>+ifneq ($(call gcc-ver,1),4)
>+# gcc 4 have lots of spurious warnings, don't -Werror
>+CFLAGS += -Werror
>+endif
>
>--
>Vincent Hanquez

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