Bug 434864 – sys-devel/gcc-4.7.1 failed to build with -mno-avx

• Status: RESOLVED DUPLICATE of bug 417271
• Product: Gentoo Linux

[Description Andrew Aladjev 2012-09-13 07:29:16 UTC]

building of gcc-4.7.1 will fail because avx is not supported

Reproducible: Always

Steps to Reproduce:
1. I want build gcc-4.7.1 on intel atom 425
2. -mno-avx added to cflags
3. gcc will try to build avx code because of not proper HAVE_AS_AVX detection

[Comment 1 Andrew Aladjev 2012-09-13 07:29:33 UTC]

Created attachment 323642 [details]
emerge info

[Comment 2 Andrew Aladjev 2012-09-13 07:31:20 UTC]

Created attachment 323644 [details, diff]
avx.patch

I dont know how to make 100% proper avx detection, but this patch works fine for me

[Comment 3 SpanKY 2012-09-13 17:05:26 UTC]

please post the actual build log as an attachment

[Comment 4 Andrew Aladjev 2012-09-13 20:54:16 UTC]

Created attachment 323710 [details]
build.log.gz

the problem is simple: it started to compile code that it should not compile. for example:

/var/tmp/portage/sys-devel/gcc-4.7.1/work/gcc-4.7.1/libitm/config/x86/x86_avx.cc:83:1: error: ‘_ITM_TYPE_M256’ does not name a type

[Comment 5 SpanKY 2012-09-13 21:48:13 UTC]

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