Trouble building gcc 7 on mingw64 (can't find limits.h)

[Loo Rong Jie]

>
> But now it's stuck on an undefined reference:

>> C:\Users\JW\AppData\Local\Temp\ccrMv82H.ltrans0.ltrans.o:<artificial>:(.text+0x7428): undefined reference to `stpcpy'

>> collect2.exe: error: ld returned 1 exit status
>> make[4]: *** [Makefile:377: liblto_plugin.la] Error 1
>> make[4]: Leaving directory '/home/JW/build-gcc-mingw64/lto-plugin'
>> make[3]: *** [Makefile:291: all] Error 2
>> make[3]: Leaving directory '/home/JW/build-gcc-mingw64/lto-plugin'
>> make[2]: *** [Makefile:16108: all-stage2-lto-plugin] Error 2
>> make[2]: Leaving directory '/home/JW/build-gcc-mingw64'
>> make[1]: *** [Makefile:23982: stage2-bubble] Error 2
>> make[1]: Leaving directory '/home/JW/build-gcc-mingw64'
>> make: *** [Makefile:945: all] Error 2
>
> Not sure what to do at this point. Shouldn't stpcpy be a part of the
> mingw64 runtime library?
>

This is an old bug in make BUILD_CONFIG=bootstrap-lto for Windows
users, see my workaround at
https://gcc.gnu.org/ml/gcc/2017-05/msg00039.html

Sincerely,
Loo Rong Jie