Hi,
I am attempting to build functioning multilib toolchains, but I see that
only one version of (most) GCC runtime DLLs are installed. This is with GCC
4.6.3.
For a Linux64 to Win64 cross compiler, I have the following DLLs in the
sysroot/prefix:
(find linux64mingw64/mingw64 -name "*.dll")
linux64mingw64/mingw64/x86_64-w64-mingw32/lib32/debug/libstdc++-6.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib32/libssp-0.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib32/libwinpthread-1.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib32/libstdc++-6.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib32/libgomp-1.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib32/libquadmath-0.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib32/libgcc_s_sjlj-1.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib32/libgfortran-3.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/debug/libstdc++-6.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libssp-0.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libwinpthread-1.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libstdc++-6.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libgomp-1.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libquadmath-0.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libgcc_s_sjlj-1.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libgfortran-3.dll
Which is great, and exactly what I expect. For a Win64 to Win64 native
compiler, though, I get the following:
(find mingw64mingw64/mingw64 -name "*.dll")
mingw64mingw64/mingw64/bin/libssp-0.dll
mingw64mingw64/mingw64/bin/libwinpthread-1.dll
mingw64mingw64/mingw64/bin/libstdc++-6.dll
mingw64mingw64/mingw64/bin/libgomp-1.dll
mingw64mingw64/mingw64/bin/libquadmath-0.dll
mingw64mingw64/mingw64/bin/libgcc_s_sjlj-1.dll
mingw64mingw64/mingw64/bin/libgfortran-3.dll
mingw64mingw64/mingw64/lib32/bin/libstdc++-6.dll
mingw64mingw64/mingw64/libexec/gcc/x86_64-w64-mingw32/4.6.3/liblto_plugin-0.dll
mingw64mingw64/mingw64/lib/bin/libstdc++-6.dll
and the other architecture DLLs are nowhere to be found. I believe the
"correct" (aka symmetric) thing to do is to install a native compiler's
"other architecture" DLLs to x86_64-w64-mingw32/lib32 or
i686-w64-mingw32/lib64, as is the case for the cross-compiler. As it stands
now a native multilib compiler built from vanilla sources is useless. I
will check GCC 4.7 to see if this has been fixed, but I fear for the worst
(see PS below).
IMHO, a completely better scheme of things would be dropping the stupid
"lib32"/"lib64", and going for the triplet all the way (and let
"-m32"/"-m64" choose the triplet):
linux64mingw64/mingw64/i686-w64-mingw32/lib/debug/libstdc++-6.dll
linux64mingw64/mingw64/i686-w64-mingw32/lib/libssp-0.dll
linux64mingw64/mingw64/i686-w64-mingw32/lib/libwinpthread-1.dll
linux64mingw64/mingw64/i686-w64-mingw32/lib/libstdc++-6.dll
linux64mingw64/mingw64/i686-w64-mingw32/lib/libgomp-1.dll
linux64mingw64/mingw64/i686-w64-mingw32/lib/libquadmath-0.dll
linux64mingw64/mingw64/i686-w64-mingw32/lib/libgcc_s_sjlj-1.dll
linux64mingw64/mingw64/i686-w64-mingw32/lib/libgfortran-3.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/debug/libstdc++-6.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libssp-0.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libwinpthread-1.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libstdc++-6.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libgomp-1.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libquadmath-0.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libgcc_s_sjlj-1.dll
linux64mingw64/mingw64/x86_64-w64-mingw32/lib/libgfortran-3.dll
This would allow for example GMP to be installed into a multilib compiler's
search path (it uses a different gmp.h).
The only solution I see *right now* is one of these:
1. Install the DLLs manually (how stupid)
2. apply runtime DLL renaming patches like TDM. Which is f-ugly as nothing
else does this kind of renaming.
Ideas? Solutions? Cause this has been a problem for over 3 major GCC
versions....
Ruben
PS: GCC bug reports and mailin list posts on this and similar issues
(although never about libgomp/libssp/libquadmath/libgfortran):
http://gcc.gnu.org/ml/gcc-help/2012-07/msg00061.html
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39947
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47142
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