bug#19111: 25.0.50; 32 bits temacs.exe is linked with wrong image-base when built on 64 bit Windows host

[Óscar Fuentes]

Eli Zaretskii <eliz@gnu.org> writes:

>> The problem is that even on i686, the $canonical triplet is
>> "x86_64-pc-mingw32". I have not tried to find out why the triplet is
>> wrong.
>
> I'm guessing this is a MSYS2 problem, since uname is an MSYS2 program,
> and it doesn't know you are going to build a 32-bit build.  Can you
> try with an explicit --host or --build argument?

It works. See below.

>> The PKGBUILD doesn't have this problem because it always passes
>> correct "--build=${MINGW_CHOST}" to configure.
>
> Not sure what PKGBUILD is and what is MINGW_CHOST it uses, or why.

PKGBUILD is a build recipe used for building a software package in MSYS2
(and Arch Linux). The PKGBUILD used for building Emacs sets --build and
--host on the configure script. When building the binary package,
MINGW_CHOST is i686-w64-mingw32.

The problem here is that, without explicitly setting --host/--build,
uname is not the right thing for detecting the host/build environment,
because uname is a MSYS2 thing, when we are building with a MinGW
toolset. So either we stop using uname for MinGW builds (use $MSYSTEM),
or document that --host/--build are required.