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Subject: Suspicious commit dated 'Sat Jul 19 23:49:26 2025 +0900'
Date: Wed, 13 Aug 2025 20:44:50 +0200
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Cc: Denis Excoffier <cygwin@Denis-Excoffier.org>
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> On 2025-08-12, 19:33, Denis Excoffier wrote:
> 
> Hello,
> 
> Today i was using cygwin-3.7.0-0.266… (found under /x86_64/release/cygwin, installed also the corresponding cygwin-doc and cygwin-devel) 
> and built the new GCC 15.2.0. Then i built many (about 100) GNU or not-so-GNU software with no errors at all until i found in tcl-9.0.2 
> that GCC returns with status 2 (i.e. not 0, not 1, not 4) for compilation of tclStubLib.o (and compilation fails). Similarly, same 
> return code (2) with fastcwd.o (and others, fastcwd is the first one) under winsup/cygwin/x86_64.
> 
> Same with GCC 15.1.0. But this was surely not the case when i installed GCC 15.1.0 in April.
> Same with cygwin-3.7.0-0.277… (the more recent one).
> 
> But not the same with cygwin-3.7.0-0.124... that i fetched on the 6th of June. In this case, compilation is ok (i checked with tcl only, not fastcwd.o).
> 
> Then i started to bisect between cygwin-3.7.0-0.124… and cygwin-3.7.0-0.277…
> 
> Unfortunately, cygwin-3.7.0 revisions from -124 to -246 are gone!
> 
> Please don’t remove cygwin test releases too early.

Well, i’m lucky since cygwin-3.7.0-0.247 does not show up the problem (which is: GCC returns sometimes with $status=2, e.g. in tcl-9.0.2 and for cygwin sources).

After bisection, it appears that the problem can be located between cygwin-3.7.0-250… and cygwin-3.7.0-256.
Three commits there on the trunk (and three on the branch):

[newlib-cygwin] Cygwin: cygheap: Add lock()/unlock() method   Takashi Yano
[newlib-cygwin] Cygwin: spawn: Lock cygheap from refresh_cygheap() until child_copy()   Takashi Yano
[newlib-cygwin] Cygwin: spawn: Make system() thread-safe   Takashi Yano

The third one seems promising. Indeed:
- i install cygwin1.dll from cygwin-3.7.0-0.250
- i build cygwin-3.7.0-0.277 with the commit 'Cygwin: spawn: Make system() thread-safe’ reverted. It builds.
- i install cygwin1.dll from the newly built cygwin-3.7.0-277 (again with commit reverted)
- i build cygwin-3.7.0-0.277 with the commit reverted. Now it builds without problem.

Similary, tcl (see above) no longer fails to build. The return code 2 from GCC seems gone.

Some additional information: under W10, no such difficulties. The problem seems to arise only with W11 (CYGWIN_NT-10.0-26100).

Please someone have a look into this commit. Sorry not being able to do it myself. Hope this however helps.

Last remark: i didn’t try with the regular GCC from the cygwin distribution; and perhaps something is missing in my GCC 15 build configuration.

Denis Excoffier.

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