Re: libtool related compile issue on msys2

On Sun, 9 Feb 2020, Torsten Kühnel wrote:

> Hi, i encountered 2 similar errors in an attempt to build check-0.14.0
> and popt-1.16 on latest msys2.

Msys2 targets native Windows APIs.  I suggest consulting Microsoft's 
API documentation.

> ...
> ./.libs/lt-ex_output.c: In function 'main':
> ./.libs/lt-ex_output.c:319:16: warning: implicit declaration of function '_spawnv'; did you mean 'spawnv'? [-Wimplicit-function-declaration]
>  319 |   rval = (int) _spawnv (_P_WAIT, lt_argv_zero, (const char * const *) newargz);
>      |                ^~~~~~~
>      |                spawnv
>
> A bit more detailed on https://pastebin.com/VKnYxXXm

It seems like a Windows header file which declares spawnv is not being 
included.

> For libcheck the problem can be solved by using cmake to build it. But
> autotools/automake build system should work, too, as long as it is supported.
>
> What i hope will be until the end of the universe :)
>
> Configuring with any CFLAGS=-D_XOPEN_SOURCE=500 or such did not solve the problem.
> Any help apreciated.

It would be senseless for -D_XOPEN_SOURCE=500 to help for Msys2 
because this is an option for POSIX APIs (specifically APIs defined by 
XOPEN), not Windows APIs.

What does this issue have to do with libtool?

I have not had any problems when compiling GraphicsMagick under msys2 
and GraphicsMagick is also using libtool and using the Windows 
spawnvp() function.

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
Public Key,     http://www.simplesystems.org/users/bfriesen/public-key.txt