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Bug 436676 - sys-devel/gcc-4.7.1 build fails in x86_avx.cc if AVX disabled but supported by as
Summary: sys-devel/gcc-4.7.1 build fails in x86_avx.cc if AVX disabled but supported b...
Status: RESOLVED DUPLICATE of bug 417271
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Core system (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Toolchain Maintainers
URL: http://gcc.gnu.org/bugzilla/show_bug....
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2012-09-30 16:16 UTC by Alessandro Di Federico
Modified: 2012-09-30 19:31 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---

Attachments
Correctly detect AVX (avx.patch,728 bytes, patch)
2012-09-30 16:16 UTC, Alessandro Di Federico 		Details | Diff
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Description Alessandro Di Federico 2012-09-30 16:16:10 UTC 
Created attachment 325392 [details, diff]
Correctly detect AVX

I've tried to build sys-devel/gcc-4.7.1 using these global CFLAGS:

CFLAGS="-O2 -pipe -march=native -mno-avx"

My CPU is i7-2820QM, so it supports avx, however due to some problems I had in the past I don't use it.

When trying to compile gcc I receive the same error as in the linked bug [1]. 

I've tried also:

CFLAGS="-O2 -pipe -march=native" emerge binutils =sys-devel/gcc-4.7.1

but I received the same error. However the attached patch, taken from the same bug report, fixed the problem.

I don't know if this a proper way to fix the bug but for me just worked fine.

[1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53113
Comment 1 Ryan Hill (RETIRED) gentoo-dev 2012-09-30 19:31:35 UTC 

*** This bug has been marked as a duplicate of bug 417271 ***