[Bug ld/29998] ld terminated with signal 11 [Segmentation fault] under mingw with LTO

[medhefgo at web dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=29998

--- Comment #7 from Jan Janssen <medhefgo at web dot de> ---
> I am stuck here because I do not have 
> /usr/lib/gcc/x86_64-w64-mingw32/12.2.0/lto-wrapper installed (and just using 
> a dummy empty file does not work).

It's as easy as:
$ deboostrap --include=gcc-12,gcc-10,gcc-mingw-w64-x86-64 sid debian-unstable
$ systemd-nspawn -M debian-unstable
To get the same env as me when I tried reproducing on a different distro. Also,
on debian the wrapper is located in
/usr/lib/gcc/x86_64-w64-mingw32/12-win32/lto-wrapper

> As a quick test, if you have both gcc 12 and gcc 10 installed, does editing 
> that command line above and using the gcc 10 plugin and/or gcc 10 lto-wrapper 
> script make the link work ?

This is rather tricky as there is only one version of mingw-gcc in distros so I
used the regular gcc (if it helps)…

$ COLLECT_GCC=x86_64-w64-mingw32-gcc COLLECT_GCC_OPTIONS="-flto=auto -nostdlib
-o test.exe -mtune=generic -march=x86-64 -dumpdir test."
/usr/bin/x86_64-w64-mingw32-ld -plugin
/usr/lib/gcc/x86_64-linux-gnu/10/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/10/lto-wrapper
-plugin-opt=-fresolution=/tmp/ccl4X7GI.res -m i386pep -Bdynamic -o test.exe
-L/usr/lib/gcc/x86_64-w64-mingw32/12-win32
-L/usr/lib/gcc/x86_64-w64-mingw32/12-win32/../../../../x86_64-w64-mingw32/lib
test2.obj libtest.a -lgcc
Segmentation fault (core dumped)

> Also - does adding "-plugin-opt=-debug" to the command line produce any more 
> helpful output ?

/usr/lib/gcc/x86_64-w64-mingw32/12.2.0/lto-wrapper
-fresolution=/tmp/cc9yab77.res -flinker-output=exec test2.obj test1.obj 
/usr/lib/gcc/x86_64-w64-mingw32/12.2.0/lto-wrapper @test.lto_wrapper_args

(Same output with successful mingw-gcc10)

-- 
You are receiving this mail because:
You are on the CC list for the bug.