[Bug preprocessor/59935] [4.9 Regression] Firefox build fails with: <built-in>: internal compiler error: Segmentation fault

[trippels at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59935

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
markus@x4 /tmp % cat foo.c
#define _GNU_SOURCE 

markus@x4 /tmp % gcc -D_GNU_SOURCE -c foo.c
foo.c:1:0: warning: "_GNU_SOURCE" redefined [enabled by default]
 #define _GNU_SOURCE 
 ^
<command-line>:0:0: note: this is the location of the previous definition
foo.c:1:0: internal compiler error: Segmentation fault