On 05/02/2017 12:11 PM, Hugo Beauzée-Luyssen wrote:
> This patch fixes cross compiling to x86_64-w64-mingw32
> See https://github.com/Alexpux/MINGW-packages/issues/1580 and
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69506
> 
> My apologies if I missed something in the contributing/sending a patch
> guidelines.
> 
> Regards,
> 
> Index: libstdc++-v3/config/os/mingw32-w64/os_defines.h
> ===================================================================
> --- libstdc++-v3/config/os/mingw32-w64/os_defines.h     (revision 247489)
> +++ libstdc++-v3/config/os/mingw32-w64/os_defines.h     (working copy)
> @@ -76,6 +76,8 @@
> 
>  #ifdef __x86_64__
>  #define _GLIBCXX_LLP64 1
> +// See libstdc++/69506
> +#define _GLIBCXX_USE_WEAK_REF 0
>  #endif
> 
>  // Enable use of GetModuleHandleEx (requires Windows XP/2003) in
> 

Looks good, go ahead and apply.