Bug 916455 – app-text/lcdf-typetools-2.108-r1: ICE on static-var pass with LTO and -fdevirtualize-at-ltrans at -O3

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description neeshy 2023-10-28 21:22:25 UTC]

ICE is observed when CFLAGS and CXXFLAGS are set to: -O3 -pipe -flto=auto -fdevirtualize-at-ltrans

Reproducible: Always

Steps to Reproduce:
Run:

CFLAGS="-O3 -pipe -flto=auto -fdevirtualize-at-ltrans" CXXFLAGS="-O3 -pipe -flto=auto -fdevirtualize-at-ltrans" emerge -1 app-text/lcdf-typetools
Actual Results:  
Here's the relevant output from the build log:

during IPA pass: static-var
lto1: internal compiler error: Segmentation fault
during IPA pass: static-var
lto1: internal compiler error: Segmentation fault
0x120f469 internal_error(char const*, ...)
        ???:0
0x1364950 lto_output()
        ???:0
0x1a63942 ipa_write_optimization_summaries(lto_symtab_encoder_d*)
        ???:0
0x1a3ac26 lto_main()
        ???:0
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
lto-wrapper: fatal error: g++ returned 1 exit status
compilation terminated.
0x120f469 internal_error(char const*, ...)
        ???:0
0x136a5fc output_symtab()
        ???:0
0x1364495 lto_output()
        ???:0
0x1a63942 ipa_write_optimization_summaries(lto_symtab_encoder_d*)
        ???:0
0x1a3ac74 lto_main()
        ???:0
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
/usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status


The ICE seems to be dependent on the optimization level. -O2 compiles fine.

I would submit this bug to GCC's bugtracker, but they've restricted account creation. Maybe someone who already has an account could submit the bug for me.

[Comment 1 neeshy 2023-10-28 21:23:14 UTC]

Created attachment 873623 [details]
lcdf-typetools-2.108-r1-build.log

[Comment 2 Sam James 2023-10-28 21:47:08 UTC]

Thanks.

I added this filter earlier today;

commit b465fdbfa7432627d207a6305b63cac882120c86
Author: Sam James <[e-mail]>
Date:   Sat Oct 28 08:07:38 2023 +0100

    app-text/lcdf-typetools: avoid known GCC ICE with -fdevirtualize-at-ltrans

    Bug: https://gcc.gnu.org/PR100010
    Signed-off-by: Sam James <[e-mail]>

[Comment 3 Alfred Wingate 2023-10-28 21:51:43 UTC]

To reproduce you also need to have the flags in LDFLAGS, otherwise I cannot reproduce.

CFLAGS="-O3 -pipe -flto=auto -fdevirtualize-at-ltrans"
CXXFLAGS="-O3 -pipe -flto=auto -fdevirtualize-at-ltrans"
LDFLAGS="-Wl,-O1 -Wl,--as-needed -O3 -pipe -flto=auto -fdevirtualize-at-ltrans"