[Bug preprocessor/64864] [5 Regression] preprocessor linemarkers break configure checks

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64864

--- Comment #7 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
The list of broken packages goes on and on.
xorg-server-1.17:

sdksyms.c:313:15: error: expected expression before ‘,’ token
     (void *) &,                                                  /*
/var/tmp/portage/x11-base/xorg-server-1.17.0/work/xorg-server-1.17.0/include/os.h:92
*/
               ^
Makefile:801: recipe for target 'sdksyms.o' failed

From sdksyms.sh: 
...
topdir=$1                                                                       
shift                                                                           
LC_ALL=C                                                                        
export LC_ALL                                                                   
${CPP:-cpp} "$@" sdksyms.c > /dev/null || exit $?                               
${CPP:-cpp} "$@" sdksyms.c | ${AWK:-awk} -v topdir=$topdir '                    
BEGIN {    
...