Hello,
To successfully compile multilib with mingw-w64, you should follow
procedure described as in
http://mingw-w64.svn.sourceforge.net/viewvc/mingw-w64/trunk/mingw-w64-doc/howto-build/mingw-w64-howto-build-adv.txt
the main points are:
1- build and install binutils
2- install headers
2b- link <install path>/x86_64-w64-mingw32/include to <install
path>/mingw/include
3- build and install gmp, mpfr and mpc (or make sure to copy them
sources respectively in <src-dir>/gmp <src-dir>/mpfr and <src-dir>/mpc )
4- build and install gcc ( make all-gcc && make install-gcc)
5- build and install mingw-w64 crt
5b- link <install path>/x86_64-w64-mingw32/lib to <install
path>/x86_64-w64-mingw32/lib64
5c- link <install path>/x86_64-64-mingw32 to <install path>/mingw (this
is only needed for stage 2 and stage 3 building, this directory may be
erased once installation has finished ;) )
Don't forget to verify that content of <install path>/mingw/lib and
<install path>/mingw/lib64 correspond exactly to <install
path>/x86_64-w64-mingw32/lib (and to <install
path>/x86_64-w64-mingw32/lib64)
6- build and install libgcc (make all-target-libgcc && make
install-target-libgcc )
7- check that there are no missplaced library into
<install-path>/lib/gcc/x86_64-w64-mingw32/lib or
<install-path>/lib/gcc/x86_64-w64-mingw32/lib32 (they should be in
respectively <install-path>/lib/gcc/x86_64-w64-mingw32/4.7.0 or
<install-path>/lib/gcc/x86_64-w64-mingw32/4.7.0/32 )
8- complete build process (3 stages ;)) and install script (make && make
install)
9- Once build and install is finished, consider to get 2 distinct
directories, added to PATH variable for the dll:
one where to find 64 bit dll version and one where to find 32 bit dll
version
Pay attention to the fact that the install script can mix different
versions of the dll in the folder <install-path> / bin. I personnaly
recommand to copy manually one version (32 bit or 64 bit) into this path .
I just still have problem to compile ada with multilib support :-S
Hope it helps
PS Excuse me for my bad english, my natural speaking is french :-)
