[llvm-commits] Patch to build 64bit LLVM with MinGW64 compiler

[Syoyo Fujita]

Takumi,

>  - mingw-w64 defines _WIN32 _WIN64 __MINGW32__ __MINGW64__.
>  - You may describe (__MINGW32__) && !(__MINGW64__) to detect
> i*86-mingw32 explicitly.
>  - I propose not to use _alloca nor __alloca, but ___chkstk on w64.
>  - I heard to you, you would use TDM-gcc for w64. It seems
> incompatible to FSF version of gcc.
>    (esp. __alloca vs _alloca, and ___chkstk vs __chkstk!!!)

The number of leading underscore is another problem.
llc and mingw emits different number of leading scores for function
symbols, so I cannot link .s generated by llc on Windows with mingw.
We need to investigate and fix it in the next step.
TDM-gcc seems it does right way, I'll check it.

>  - Please read http://llvm.org/docs/DeveloperPolicy.html#patches ;)

Okay, I understand it.