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

[Dani Moncayo <dmoncayo@gmail.com>]

>> It seems that the new value of $canonical, obtained in this case via
>> "gcc -v", is lacking the "i686-pc-" prefix.
>
> What's the output of `gcc -v' ?

------------------------------------------------
$ gcc -v
Using built-in specs.
COLLECT_GCC=c:\mingw\bin\gcc.exe
COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/mingw32/4.7.2/lto-wrapper.exe
Target: mingw32
Configured with: ../gcc-4.7.2/configure
--enable-languages=c,c++,ada,fortran,objc,obj-c++
--disable-sjlj-exceptions --wi
th-dwarf2 --enable-shared --enable-libgomp --disable-win32-registry
--enable-libstdcxx-debug --disable-build-poststage1-
with-cxx --enable-version-specific-runtime-libs --build=mingw32 --prefix=/mingw
Thread model: win32
gcc version 4.7.2 (GCC)
------------------------------------------------

But it seems that different flavors of MinGW compilers are not
consistent wrt the "Target" line shown there: for example, I've just
installed the mingw64-i686 toolchain in Cygwin, and there I get this:

------------------------------------------------
$ /usr/bin/i686-w64-mingw32-gcc.exe -v
Using built-in specs.
COLLECT_GCC=/usr/bin/i686-w64-mingw32-gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-w64-mingw32/4.8.3/lto-wrapper.exe
Target: i686-w64-mingw32
Configured with:
/cygdrive/i/szsz/tmpp/cygwin64/mingw64-i686/mingw64-i686-gcc-4.8.3-1/src/gcc-4.8.3/configure
--srcdir=/cygdrive/i/szsz/tmpp/cygwin64/mingw64-i686/mingw64-i686-gcc-4.8.3-1/src/gcc-4.8.3
--prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin
--libexecdir=/usr/libexec --datadir=/usr/share --localstatedir=/var
--sysconfdir=/etc --libdir=/usr/lib --datarootdir=/usr/share
--docdir=/usr/share/doc/mingw64-i686-gcc
--htmldir=/usr/share/doc/mingw64-i686-gcc/html -C
--build=x86_64-pc-cygwin --host=x86_64-pc-cygwin
--target=i686-w64-mingw32 --without-libiconv-prefix
--without-libintl-prefix --with-sysroot=/usr/i686-w64-mingw32/sys-root
--with-build-sysroot=/usr/i686-w64-mingw32/sys-root --disable-multilib
--disable-win32-registry
--enable-languages=c,ada,c++,fortran,lto,objc,obj-c++
--enable-fully-dynamic-strings --enable-graphite --enable-libgomp
--enable-libquadmath --enable-libquadmath-support --enable-libssp
--enable-version-specific-runtime-libs --with-dwarf2 --with-gnu-ld
--with-gnu-as --with-tune=generic
--with-cloog-include=/usr/include/cloog-isl --with-system-zlib
--libexecdir=/usr/lib
Thread model: win32
gcc version 4.8.3 (GCC)
------------------------------------------------

-- 
Dani Moncayo