[Bug c/82787] New: gnu gcc (4.8 - 7.1) cannot parse some system headers in macOS (10.13)

["drikosev at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82787

            Bug ID: 82787
           Summary: gnu gcc (4.8 - 7.1) cannot parse some system headers
                    in macOS (10.13)
           Product: gcc
           Version: 7.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: drikosev at gmail dot com
  Target Milestone: ---

Hi,

gcc fails to parse various system headers in the latest macOS release (High
Sierra, 10.13).

One of the failures is this:

$ cat syslog.c
#include <syslog.h>
int main() {
 return 0;
}
$ gcc7 syslog.c
In file included from /usr/include/sys/cdefs.h:587:0,
                 from /usr/include/sys/syslog.h:65,
                 from /usr/include/syslog.h:23,
                 from syslog.c:1:
/usr/include/sys/syslog.h:227:124: error: expected ',' or ';' before '__asm'
 void syslog(int, const char *, ...) __printflike(2, 3) __not_tail_called
__DARWIN_ALIAS_STARTING(__MAC_10_13, __IPHONE_NA, __DARWIN_EXTSN(syslog));
                                                                               
                                            ^
$ gcc7 --version | head -n 1 
gcc7 (GCC) 7.1.1 20170622

Regards,
Ev. Drikos