Re: [w32] Build failure on master (pthread_sigmask.h)

[Eli Zaretskii <eliz@gnu.org>]

> From: Richard Copley <rcopley@gmail.com>
> Date: Thu, 30 May 2019 16:54:13 +0100
> Cc: Emacs Development <emacs-devel@gnu.org>
> 
>  > gcc  -c -mtune=generic   -DUSE_CRT_DLL=1 -I /c/projects/emacs/nt/inc -mtune=generic  -MMD -MF
>  > deps/pthread_sigmask.d -MP -fno-common -O2 -I. -I../src -I. -I./../src  pthread_sigmask.c
>  > In file included from C:/msys64/mingw64/x86_64-w64-mingw32/include/signal.h:10,
>  >                  from pthread_sigmask.c:20:
>  > pthread_sigmask.c:34:1: error: expected identifier or '(' before numeric constant
>  >    34 | pthread_sigmask (int how, const sigset_t *new_mask, sigset_t *old_mask)
>  >       | ^~~~~~~~~~~~~~~
> 
>  This doesn't happen to me, but I don't use MinGW64.
> 
>  Can you spot the part of the changes which caused us to include
>  pthread_signal.h?  We shouldn't include any part of pthreads in the
>  Windows build.
> 
> Not beyond the obvious (it's the pthread_sigmask.m4 changes), no. Sorry.
> Prior to this change, lib\pthread_sigmask.c wasn't compiled at all AFAICS. 

We need to augment nt/mingw-cfg.site to bypass pthread_sigmask, there
are already some settings there to that effect, we need to adapt them
to this Gnulib change.  Maybe try adding this line to mingw-cfg.site:

  gl_cv_func_pthread_sigmask_macro=no

If that doesn't help, please show the relevant parts of your
config.log.  Anything that matches "pthread".

(On my box the problem doesn't happen because I don't have the
pthread.h header polluting my system.)