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Date:	Sat, 16 Aug 2025 06:32:45 +0900
To:	cygwin AT cygwin DOT com
Subject:	Re: Suspicious commit dated 'Sat Jul 19 23:49:26 2025 +0900'
Message-Id:	<20250816063245.23b538b41befef275f37f484@nifty.ne.jp>
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References:	<03D1D669-A7CF-40C3-A671-EEAA20A31448 AT Denis-Excoffier DOT org>
	<533DB209-713C-4580-9575-F7C4DAD43FBB AT Denis-Excoffier DOT org>
	<20250815215842 DOT d0f48a86d3bc251798a28a2b AT nifty DOT ne DOT jp>
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From:	Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
Errors-To:	cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
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On Fri, 15 Aug 2025 21:58:42 +0900
Takashi Yano wrote:
> On Wed, 13 Aug 2025 20:44:50 +0200
> Denis Excoffier wrote:
> > 
> > > On 2025-08-12, 19:33, Denis Excoffier wrote:
> > > 
> > > Hello,
> > > 
> > > Today i was using cygwin-3.7.0-0.266$B!D(B (found under /x86_64/release/cygwin, installed also the corresponding cygwin-doc and cygwin-devel) 
> > > and built the new GCC 15.2.0. Then i built many (about 100) GNU or not-so-GNU software with no errors at all until i found in tcl-9.0.2 
> > > that GCC returns with status 2 (i.e. not 0, not 1, not 4) for compilation of tclStubLib.o (and compilation fails). Similarly, same 
> > > return code (2) with fastcwd.o (and others, fastcwd is the first one) under winsup/cygwin/x86_64.
> > > 
> > > Same with GCC 15.1.0. But this was surely not the case when i installed GCC 15.1.0 in April.
> > > Same with cygwin-3.7.0-0.277$B!D(B (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$B!D(B and cygwin-3.7.0-0.277$B!D(B
> > > 
> > > Unfortunately, cygwin-3.7.0 revisions from -124 to -246 are gone!
> > > 
> > > Please don$B!G(Bt remove cygwin test releases too early.
> > 
> > Well, i$B!G(Bm lucky since cygwin-3.7.0-0.247 does not show up the problem (which is: GCC returns sometimes with $status=2, e.g. in tcl-9.0.2 and for cygwin sources).
> > 
> > After bisection, it appears that the problem can be located between cygwin-3.7.0-250$B!D(B 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$B!G(B reverted. It builds.
> > - i install cygwin1.dll from the newly built cygwin-3.7.0-277 (again with commit reverted)
> > - i build cygwin-3.7.0-0.277 with the commit reverted. Now it builds without problem.
> > 
> > Similary, tcl (see above) no longer fails to build. The return code 2 from GCC seems gone.
> > 
> > Some additional information: under W10, no such difficulties. The problem seems to arise only with W11 (CYGWIN_NT-10.0-26100).
> > 
> > Please someone have a look into this commit. Sorry not being able to do it myself. Hope this however helps.
> > 
> > Last remark: i didn$B!G(Bt try with the regular GCC from the cygwin distribution; and perhaps something is missing in my GCC 15 build configuration.
> > 
> 
> I could not reproduce the issue.
> 
> I followed the following steps.
> 
> 1) wget http://prdownloads.sourceforge.net/tcl/tcl9.0.2-src.tar.gz
> 2) tar xf tcl9.0.2-src.tar.gz
> 3) cd tcl9.0.2/unix
> 4) ./configure && make -j8
> 
> tcl 9.0.2 was successfully built.
> 
> I'm using cygwin 3.7.0-0.277.g45f9b4841373.x86_64 (Test) and
> gcc 15.1.1+20250726-0.1 (Test) on windows 11.
> 
> I also tested with gcc 16.0.0+20250727-0.1 (Test) and the result
> is the same.
> 
> Could you please confirm the issue happens with cygwin gcc package?

I could reproduce the issue and confirmed the issue occurs even
with gcc 13.4.0 (cygwin package) on Windows 11.

I looked into the issue and found the cause. I'll submit a patch
for the issue.

Thanks for finding this issue.

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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