Bug 658514 – sys-devel/gcc-7.3.0-r3: fails to build due to illegal instruction

• Status: RESOLVED WORKSFORME
• Product: Gentoo Linux

[Description farmboy0 2018-06-19 18:27:38 UTC]

Build log and emerge --info ill be attached.
If you need more input please ask.

[Comment 1 farmboy0 2018-06-19 18:28:50 UTC]

Created attachment 536450 [details]
emerge --info

[Comment 2 Tomáš Mózes 2018-06-20 04:10:43 UTC]

The build log would help.

[Comment 3 farmboy0 2018-06-20 19:01:59 UTC]

Created attachment 536616 [details]
build log

[Comment 4 Sergei Trofimovich (RETIRED) 2018-07-08 09:15:20 UTC]

My guess would be that -march=native incorrectly detects some features on your CPU. We need to find which instructions were generated and which feature wa misdetected.

Please post the output of
    LANG=C gcc -Q --help=target -march=native
and we'll try to find which features was it.

Can you also extract instruction that was attempted to be executed? The crash was in:

    /bin/bash: line 1:  8572 Illegal instruction     build/genextract /tmp/portage/sys-devel/gcc-7.3.0-r3/work/gcc-7.3.0/gcc/common.md /tmp/portage/sys-devel/gcc-7.3.0-r3/work/gcc-7.3.0/gcc/config/i386/i386.md insn-conditions.md > tmp-extract.c

If you run something like:

  $ gdb --args build/genextract /tmp/portage/sys-devel/gcc-7.3.0-r3/work/gcc-7.3.0/gcc/common.md /tmp/portage/sys-devel/gcc-7.3.0-r3/work/gcc-7.3.0/gcc/config/i386/i386.md insn-conditions.md

  gdb> run
  gdb> bt
  gdb> disassemble

gdb should show what was attempted to be executed.

[Comment 5 farmboy0 2018-09-09 10:54:06 UTC]

This can be closed.
After a few attempts the package built.
Im not aware what i might have changed if anything that led to the success.

[Comment 6 Sergei Trofimovich (RETIRED) 2018-09-09 11:44:24 UTC]

Sounds good!