On 7/1/2010 10:21, Paarvai Naai wrote:
> As I have mentioned in some recent emails, I am building my mingw-w64
> toolchain using upstream binutils-2.20.1, gcc 4.5.0, and
> mingw-w64-v1.0-20100604 snapshot. The host is i386-linux and the
> target is x86_64-w64-mingw32 with multilib support.
>
> I am running into a strange auto-import issue when compiling for C++:
>
> ] /usr/local/gcc/x86_64-windows-gcc/bin/x86_64-windows-g++ -o
> hello.exe hello.cxx
> Info: resolving std::cout by linking to __imp___ZSt4cout (auto-import)
> /usr/local/gcc/x86_64-windows-gcc/lib/gcc/x86_64-w64-mingw32/4.5.0/../../../../x86_64-w64-mingw32/bin/ld:
> warning: auto-importing has been activated without
> --enable-auto-import specified on the command line.
> This should work unless it involves constant data structures
> referencing symbols from auto-imported DLLs.
>
> But the libstdc++ library should already be a proper import library:
> /usr/local/gcc/x86_64-windows-gcc/x86_64-w64-mingw32/lib64/libstdc++.dll.a
>
> The test program is again simple:
> --
> #include<stdio.h>
> #include<iostream>
> using namespace std;
>
> int main (int argc, char *argv[])
> {
> printf("hello world!\n");
> cout<< "bye world!\n";
> return 0;
> }
> --
>
> I'd prefer not to turn on auto-importing with the --enable-auto-import
> option as it will mask auto-importing in other libraries. Does anyone
> have any idea why this is happening or how to fix it?
>
> Paarvai
Hi,
its not due to having libstdc++.dll.a around. Its a warning saying that
gcc and the linker wasn't expecting an import library to be used. The
libstdc++-v3 headers don't have the dllimport statements.
ktietz has since patched ld to properly do auto-imports with the
--enable-runtime-pseudo-reloc-v2 changes becoming default. In short you
can ignore this warning.
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