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

[Liu Hao]

On 2017/5/4 23:54, J.W. Jagersma wrote:
 > Well it got to the next stage after I did this:
 >> ln -s /mingw64/x86_64-w64-mingw32/include 
/home/jw/build-gcc-mingw64/x86_64-w64-mingw32/include
If you are building a native compiler which does not recognize POSIX-ish 
paths, you probably have to replace that /mingw thing with a real, 
absolute path, as in 
<https://github.com/Alexpux/MINGW-packages/blob/master/mingw-w64-gcc-git/PKGBUILD#L116>. 
The previous 'cpp fails sanity check' error might be caused by the 
inconsistency between hardcoded header paths and the real paths (bug 
70936 does not take place if the hardcoded path is valid).

 >
 > 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?
 >
No. It is a POSIX function but not a standard C function so our CRT is 
not responsible for implementing it. I guess you are probaby linking 
against MSYS libraries (which provide POSIX functions) at stage1 and 
configure mistakenly reports `stpcpy()` is available, but since you are 
building a native Windows compiler, it is not.


-- 
Best regards,
LH_Mouse