Bug 639746 – sys-devel/gcc-6.4.0: fail on weird but valid construct found in matplotlib

• Status: RESOLVED DUPLICATE of bug 638792
• Product: Gentoo Linux

[Description tharvik 2017-12-04 10:57:43 UTC]

Created attachment 508006 [details]
Reduced bug trigger

https://bugs.gentoo.org/638792 reports that GCC fail to compile matplotlib with -O2 with an "internal compiler error: Segmentation fault". I've tried to reduce the size of the file triggering the failure and have come down to the attached file.

To reproduce, switch to the new sys-devel/gcc:6.4.0 compiler and `g++ -O2 a.cpp` should trigger it.

[Comment 1 tharvik 2017-12-04 10:58:22 UTC]

Created attachment 508008 [details]
emerge --info sys-devel/gcc:6.4.0

[Comment 2 Felix Janda 2017-12-04 11:27:23 UTC]

`g++ -O -ftree-pre a.cpp` seems sufficient to trigger the segfault.

It would be interesting to see whether this is fixed in gcc-7.

[Comment 3 Andrei Slavoiu 2017-12-04 21:31:09 UTC]

Same here with gcc-7.2. Both with -O2 and with -O -ftree-pre

[Comment 4 Jeroen Roovers (RETIRED) 2017-12-06 08:03:22 UTC]

*** This bug has been marked as a duplicate of bug 638792 ***