GNU bug report logs - #35410
27.0.50; 32-bit build of master failing with MSYS2

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: martin rudalics <rudalics <at> gmx.at>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#35410: closed (27.0.50; 32-bit build of master failing with
 MSYS2)
Date: Wed, 09 Oct 2019 18:12:03 +0000

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Your message dated Wed, 9 Oct 2019 20:11:38 +0200
with message-id <c763bfb6-7c8e-2c49-a43b-c1340bb55bff <at> gmx.at>
and subject line Re: bug#35410: 27.0.50; 32-bit build of master failing with MSYS2
has caused the debbugs.gnu.org bug report #35410,
regarding 27.0.50; 32-bit build of master failing with MSYS2
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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35410: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=35410
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From: martin rudalics <rudalics <at> gmx.at>
To: Bug-Gnu-Emacs <bug-gnu-emacs <at> gnu.org>
Subject: 27.0.50; 32-bit build of master failing with MSYS2
Date: Wed, 24 Apr 2019 09:28:50 +0200

Trying a 32-bit MSYS2 build of master on Windows 10 configured with
CFLAGS='-O3' gets me here:

w32.o:w32.c:(.text+0xa29f): undefined reference to `_imp___futime32'
collect2.exe: error: ld returned 1 exit status
make[1]: *** [Makefile:643: temacs.exe] Fehler 1
make[1]: Verzeichnis „/c/emacs/trunk/opt-32/src“ wird verlassen
make: *** [Makefile:423: src] Fehler 2

A build configured with CFLAGS='-O0 -g3' proceeds without problems.
The 32-builds use gcc 7.4.0.  64-bit builds with the same options
proceed without problems using gcc 8.3.0.

A workaround here is to add a check to mingw_time.h like

/* The @#$%^&! MinGW developers stopped updating the values of
   __MINGW32_VERSION, __MINGW32_MAJOR_VERSION, and
   __MINGW32_MINOR_VERSION values in v4.x of the runtime, to
   "discourage its uses".  So the values of those macros can no longer
   be trusted, and we need the workaround below, to have a single set
   of macros we can trust.  (The .17 minor version is arbitrary.)  */
#ifdef __MINGW32__
#include <_mingw.h>
# ifndef __CRT__NO_INLINE
#  define __CRT__NO_INLINE
# endif
#endif

martin

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From: martin rudalics <rudalics <at> gmx.at>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 35410-done <at> debbugs.gnu.org
Subject: Re: bug#35410: 27.0.50; 32-bit build of master failing with MSYS2
Date: Wed, 9 Oct 2019 20:11:38 +0200

>  > Hmm, I tried updating, but now my mingw32 gcc is 9.1.0, and it still
>  > builds fine.  I'm not sure if it's practical to support old compiler
>  > versions from a rolling release.
>
> The problem is not with the compiler version per se but with the
> headers shipped with MinGW64.  So hopefully they fixed that problem in
> our sense in the meantime.  I'm reluctant to update as well because
> the 64-bit builds work sufficiently well and updating always bears the
> risk spoiling that.  I filed the report only to hear opinions from
> other MinGW64 users but apparently neither of them uses my version.

I now upgraded MSYS2 to its present version and it builds fine so I'm
hopefully closing this bug.

Thanks for the heads-up, martin

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