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From: "unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/104057] cross compiler multilibs libs path too chaos
Date: Mon, 17 Jan 2022 01:45:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104057

--- Comment #19 from cqwrteur <unlvsur at live dot com> ---
(In reply to cqwrteur from comment #18)
> (In reply to Andrew Pinski from comment #17)
> > also multilib directories under ${prefix} for a cross does not use OS
> > directories as most cross compilers have OS directories.
>=20
> Of course. I installed Linux kernel headers and glibc.
>=20
> they are installed in $PREFIX/$TARGET
>=20
> Since we need to build 32 glibc, x32 glibc, 64 glibc. I installed them in=
to
> separate dirs and copy files with each other. Or they will overwrite file.
>=20
> Then copy all headers to $PREFIX/$TARGET/include
>=20
> glibc32/lib to $PREFIX/lib32 $PREFIX/lib/32
>=20
> glibc64/lib to $PREFIX/lib64 $PREFIX/lib
>=20
> glibcx32/lib to $PREFIX/libx32 $PREFIX/lib/x32

https://pete.akeo.ie/2010/07/compiling-mingw-w64-with-multilib-on.html

Here was a similar result other people built 10 years ago. I find this issue
happens for all targets, not just x86_64-w64-mingw32. The GCC just find
different directories at build stage and after build.=