I'm trying to install the w64 compiler on a Ubuntu Linux machine,
following the instructions at:
http://sourceforge.net/apps/trac/mingw-w64/wiki/Cross Win32 and Win64
compiler
I am unable to build the shared 64 bit libgcc_s_sjlj-1.dll
Tracking down the problem, it seems that the compiler emits symbols with
a leading underscore, but attempts to export those symbols without the
leading underscore in 64 bit mode (The 32-bit libgcc_s_sjlj-1.dll was
built with no problems). All exports fail with a message like:
Cannot export _Unwind_Backtrace: symbol not defined.
Using x86_64-w64-mingw32-nm to examine the intermediate library
.../build/x86_64-w64-mingw32/libgcc/shlib/libgcc_s.a.tmp, I can see the
symbols:
libgcc_s.a.tmp:d000001.o:0000000000000000 T __Unwind_Backtrace
libgcc_s.a.tmp:d000001.o:0000000000000000 I __imp___Unwind_Backtrace
Apparently in 64 bit mode GCC-4.5.1 tries to export the symbols without
the leading underscore when building a dll, and then fails when it can't
find the symbol.
Here's my configuration:
GCC-4.5 exported from the 4.5 branch, Revision 167434 on 12/3/2010.
Binutils 2.20.1
configure -v --with-pkgversion='GCC Mingw-w64 cross compiler'
--{host,build}=x86_64-linux-gnu --target=x86_64-w64-mingw32
--enable-multilib --enable-64bit
--{prefix,with-sysroot}=/usr/local/Mingw-w64 --enable-static
--enable-shared=libgcc --enable-fully-dynamic-string
--enable-languages=c --enable-libssp --with-host-libstdcxx="-lstdc++
-lsupc++" --with-{gmp,mpfr,mpc,cloog,ppl}=/usr --with-gnu-ld
--with-system-zlib --disable-werror --enable-targets=all
--enable-threads=win32 --enable-lto
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