[Bug ld/12742] ld error "unrecognized option '-plugin'" on mingw and how to build with plugins enabled on mingw

[gjl at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12742

--- Comment #9 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2012-03-01 
21:29:25 UTC ---
Tried again today and I can do a Canadian cross build and LTO works :-))

Configuration was 

Build  = i686-pc-linux-gnu
Host   = i386-pc-mingw32
Target = avr-unknown-none

With GCC 3.4.5 as linux -> mingw32 cross
and GCC from trunk with 50616 fixed.

Binutils were from trunk but some days/weeks old.
There was no fake libdl or dlfcn-win32 in the build environment.

The last problem I had was that the linker calls the plugin but failed to
operate properly on it; presumably unloading the dll but I don't know enough of
that stuff.

Anyways, now it works and a small LTO compile finished without error and
produced reasonable results and optimizations that only LTO can perform. Great!

Hope I will find the time to bundle the snapshot build so that more people can
test and experiment with it and report problems.

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