by jon.forums:

What steps will reproduce the problem?
If possible, include a link to a program on play.golang.org.
1. C:\DevKit-mblds\devkitvars.bat
2. cd C:\Apps\go-hg\src
3. all.bat

What is the expected output?

C:\Apps\go-hg\src>all.bat
...
ALL TESTS PASSED

---
Installed Go for windows/386 in C:\Apps\go-hg
Installed commands in C:\Apps\go-hg\bin
*** You need to add C:\Apps\go-hg\bin to your PATH.

What do you see instead?

# Building compilers and Go bootstrap tool.
lib9
In file included from C:\Apps\go-hg\src\lib9\cleanname.c:28:0:
C:\Apps\go-hg\include/libc.h:312:8: error: redefinition of 'struct timespec'
In file included from
c:\devkit-mblds\mingw\bin\../lib/gcc/i686-w64-mingw32/4.7.2/../../..
/../i686-w64-mingw32/include/process.h:12:0,
                 from c:\devkit-mblds\mingw\bin\../lib/gcc/i686-w64-mingw32/4.7.2/../../..
/../i686-w64-mingw32/include/unistd.h:11,
                 from C:\Apps\go-hg\include/u.h:61,
                 from C:\Apps\go-hg\src\lib9\cleanname.c:27:
c:\devkit-mblds\mingw\bin\../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw32/i
nclude/sys/types.h:89:8: note: originally defined here
In file included from C:\Apps\go-hg\src\lib9\cleanname.c:28:0:
C:\Apps\go-hg\include/libc.h:320:12: error: conflicting types for 'nanosleep'
In file included from
c:\devkit-mblds\mingw\bin\../lib/gcc/i686-w64-mingw32/4.7.2/../../..
/../i686-w64-mingw32/include/time.h:285:0,
                 from C:\Apps\go-hg\include/u.h:72,
                 from C:\Apps\go-hg\src\lib9\cleanname.c:27:
c:\devkit-mblds\mingw\bin\../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw32/i
nclude/pthread_time.h:84:28: note: previous declaration of 'nanosleep' was hereIn file
inc
luded from C:\Apps\go-hg\src\lib9\_p9dir.c:28:0:
C:\Apps\go-hg\include/libc.h:312:8: error: redefinition of 'struct timespec'In file
includ
ed from C:\Apps\go-hg\src\lib9\atoi.c:27:0:
C:\Apps\go-hg\include/libc.h:312:8: error: redefinition of 'struct timespec'In file
includ
ed from C:\Apps\go-hg\src\lib9\_exits.c:27:0:
C:\Apps\go-hg\include/libc.h:312:8: error: redefinition of 'struct timespec'

...

Which compiler are you using (5g, 6g, 8g, gccgo)?

C:\Apps\go-hg\src>gcc --version
gcc (rev10, Built by MinGW-builds project) 4.7.2

Which operating system are you using?

Windows 7 32bit

Which version are you using?  (run 'go version')

C:\Apps\go-hg\src>hg id
cc6264adc22b+ tip

Please provide any additional information below.

Succesfully tested the following patch with mingwbuilds gcc 4.7.2 (mingw-w64), rubenvb
gcc 4.7.2 (mingw-w64), and mingw gcc 4.6.2 (mingw.org).


diff --git a/include/libc.h b/include/libc.h
--- a/include/libc.h
+++ b/include/libc.h
@@ -308,7 +308,7 @@
 
 #ifdef _WIN32
 
-#ifndef _WIN64
+#if !defined(_WIN64) && !defined(__MINGW64_VERSION_MAJOR)
 struct timespec {
    int tv_sec;
    long tv_nsec;