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Multilib seems to fail for mingw-w64 build


I am trying to compile a multilib-enabled GCC cross-compiler targetting mingw-w64. I have the mingw-w64 headers installed, the CRT built for both 32- and 64-bit, and installed (with libs in $ROOT/x86_64-w64-mingw32/lib32 and $ROOT/x86_64-w64-mingw32/lib respectively).

Building the compiler itself work, but it fails to link 32-bit libgcc because it is not looking for the mingw libraries in the right place. The configure line is:

    ../gcc-src/configure --prefix=$ROOT --with-sysroot=$ROOT --disable-werror --target=x86_64-w64-mingw32 --enable-targets=all

but when it gets to link 32-bit libgcc_s_sjlj-1.dll, it fails because it is searching for 32-bit libmingwthrd.a in the 64-bit library directory:

    /Users/fx/devel/mingw-w64/cross/x86_64-w64-mingw32/bin/ld: skipping incompatible /Users/fx/devel/mingw-w64/cross/x86_64-w64-mingw32/lib/libmingwthrd.a when searching for -lmingwthrd

The reason behind that is simply that, when building 32-bit libgcc, the wrong flags are passed to xgcc:

    -L$ROOT/x86_64-w64-mingw32/lib -L$ROOT/mingw/lib -isystem $ROOT/x86_64-w64-mingw32/include -isystem $ROOT/mingw/include -B$ROOT/x86_64-w64-mingw32/bin/ -B$ROOT/x86_64-w64-mingw32/lib/ -isystem $ROOT/x86_64-w64-mingw32/include -isystem $ROOT/x86_64-w64-mingw32/sys-include

These flags all refer to lib instead of lib32.

I can reproduce the problem with both GCC trunk and GCC 6.3.0. Have I missed a configuration flag? Otherwise it seems like a bug in the multilib setup, because the target configuration file seems correct:

$ cat gcc/config/i386/t-mingw-w64
MULTILIB_OSDIRNAMES = ../lib ../lib32

Any help in debugging this would be appreciated.


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