[Bug go/77809] New: "_LITTLE_ENDIAN" redefined

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77809

            Bug ID: 77809
           Summary: "_LITTLE_ENDIAN" redefined
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: go
          Assignee: ian at airs dot com
          Reporter: glisse at gcc dot gnu.org
                CC: cmang at google dot com
  Target Milestone: ---
              Host: powerpc64le-unknown-linux-gnu
            Target: powerpc64le-unknown-linux-gnu
             Build: powerpc64le-unknown-linux-gnu

Bootstrap (--enable-languages=all,obj-c++,go) fails in libgo:

/home/glisse/test/pristine/build/./gcc/xgcc
-B/home/glisse/test/pristine/build/./gcc/
-B/home/glisse/test/pristine/inst/powerpc64le-unknown-linux-gnu/bin/
-B/home/glisse/test/pristine/inst/powerpc64le-unknown-linux-gnu/lib/ -isystem
/home/glisse/test/pristine/inst/powerpc64le-unknown-linux-gnu/include -isystem
/home/glisse/test/pristine/inst/powerpc64le-unknown-linux-gnu/sys-include   
-DHAVE_CONFIG_H -I. -I/home/glisse/pristine/libgo  -I
/home/glisse/pristine/libgo/runtime
-I/home/glisse/pristine/libgo/../libffi/include -I../libffi/include -pthread 
-fexceptions -fnon-call-exceptions -fplan9-extensions -fsplit-stack -Wall
-Wextra -Wwrite-strings -Wcast-qual -Werror  -D_GNU_SOURCE -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 -I /home/glisse/pristine/libgo/../libgcc -I
/home/glisse/pristine/libgo/../libbacktrace -I ../../gcc/include -fPIC -g -O2
-MT libgobegin_a-go-main.o -MD -MP -MF .deps/libgobegin_a-go-main.Tpo -c -o
libgobegin_a-go-main.o `test -f 'runtime/go-main.c' || echo
'/home/glisse/pristine/libgo/'`runtime/go-main.c
In file included from /home/glisse/pristine/libgo/runtime/runtime.h:116:0,
                 from /home/glisse/pristine/libgo/runtime/go-main.c:17:
./runtime.inc:2650:0: error: "_LITTLE_ENDIAN" redefined [-Werror]
 #define _LITTLE_ENDIAN 1234

<built-in>: note: this is the location of the previous definition
cc1: all warnings being treated as errors