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Bug 571264 (PR69187) - [ICE/5] media-libs/libwebp-0.4.x: fails to native compile on ARMv7 with GCC 5.x with -mfpu=*neon
Summary: [ICE/5] media-libs/libwebp-0.4.x: fails to native compile on ARMv7 with GCC 5...
Status: RESOLVED FIXED
Alias: PR69187
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: ARM Linux
: Normal normal (vote)
Assignee: Gentoo Toolchain Maintainers
URL: https://gcc.gnu.org/PR69187
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-01-08 12:18 UTC by Vladimir Smirnov (RETIRED)
Modified: 2016-05-13 17:20 UTC (History)
4 users (show)

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

Attachments
emerge --info (emerge.info,5.24 KB, text/plain)
2016-01-08 12:22 UTC, Vladimir Smirnov (RETIRED) 		Details
build.log (build.log,64.65 KB, application/octet-stream)
2016-01-08 12:23 UTC, Vladimir Smirnov (RETIRED) 		Details
View All Add an attachment (proposed patch, testcase, etc.)

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Description Vladimir Smirnov (RETIRED) gentoo-dev 2016-01-08 12:18:20 UTC 
There is a bug in GCC-5.x that prevents libwebp-0.4x to be native compiled with GCC 5.x (tested on 5.3, but I was able to find same reports in Fedora about gcc 5.1) if neon is enabled (mfpu=neon, mfpu=vfpv4-neon, etc).

Compiler just returns ICE: Aborted.

Reproducible: Always

Steps to Reproduce:
1. Ensure that mfpu=neon or mfpu=vfpv4-neon is in CFLAGS
2. emerge media-libs/libwebp

Actual Results:  
In file included from /var/tmp/portage/media-libs/libwebp-0.4.2/work/libwebp-0.4.2/src/dsp/upsampling_neon.c:20:0:
/usr/lib/gcc/armv7a-hardfloat-linux-gnueabi/5.3.0/include/arm_neon.h: In function ‘UpsampleRgbaLinePair’:
/usr/lib/gcc/armv7a-hardfloat-linux-gnueabi/5.3.0/include/arm_neon.h:6697:10: internal compiler error: Aborted
   return (int32x4_t)__builtin_neon_vmlals_lanev4hi (__a, __b, __c, __d);
          ^

Expected Results:  
Should compile fine.

Upstream gcc's bug with minimal testcase: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69187 - No fix yet, cause I've reported that yesterday

Cross-compiler is not affected.

Bumping to 0.4.4 won't help, but in 0.5.0 they rewrote that part of code and doesn't use affected bultin.
Comment 1 Vladimir Smirnov (RETIRED) gentoo-dev 2016-01-08 12:22:03 UTC 
Created attachment 422276 [details]
emerge --info

I'm testing everything on Jetson TK1 with nvidia's kernel.

Toolchain overlay was added to test if it happens in gcc-6.0 without gentoo specific patches, for upstream bugreport (actually it happens).

Also forgot to mention that gcc 4.9 is not affected.
Comment 2 Vladimir Smirnov (RETIRED) gentoo-dev 2016-01-08 12:23:57 UTC 
Created attachment 422278 [details]
build.log
Comment 3 Alexis Ballier gentoo-dev 2016-01-08 12:48:42 UTC 
well, ICEs are usually gcc bugs :)