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Re: Unexec dumping results in "Segmentation fault" on Windows Msys2

From: Nikolay Kudryavtsev
Subject: Re: Unexec dumping results in "Segmentation fault" on Windows Msys2
Date: Sun, 4 Apr 2021 11:41:33 +0300
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.9.0

Yeah, I know about GDB, but was thinking that someone with more experience than me at debugging such issues would be able to independently confirm this. I'll try GDB eventually and report my findings.

The second crash happened for unexec, it seems like (some) pdumper code was getting built there. I can confirm that your commit fixed unexec at least to the point that I'm getting the same segfault now. Another issue with master I just ran into is:

D:/Emacs/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: image.o:image.c:(.text+0x7307): undefined reference to `rsvg_handle_set_stylesheet' D:/Emacs/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: image.o:image.c:(.text+0x73d7): undefined reference to `rsvg_handle_set_stylesheet'

Doing --without-rsvg works. The current msys2 rsvg version is librsvg-2.50.3-1. Looks like possible fallout from #44065, since a similar result was reported there.

As for why am I even bothering with unexec - I started at noticing that compiling 26.3 no longer works with the newer Msys2 versions, though I was sure able to compile it before. Then I eventually tracked that it's unexec that's the problem and the reason 27 works is due to pdumper.

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