[Bug bootstrap/72833] New: [7 regression] error in fortran/parse.c (unexpected_eof) on Mac OS X 10.7

[ro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72833

            Bug ID: 72833
           Summary: [7 regression] error in fortran/parse.c
                    (unexpected_eof) on Mac OS X 10.7
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
                CC: edlinger at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-apple-darwin11.4.2
            Target: x86_64-apple-darwin11.4.2
             Build: x86_64-apple-darwin11.4.2

Between 20160729 and 20160805, Mac OS X 10.7 bootstrap got broken:

/vol/gcc/src/hg/trunk/local/gcc/fortran/parse.c: In function 'void
unexpected_eof()':
/vol/gcc/src/hg/trunk/local/gcc/fortran/parse.c:2618:1: error: 'noreturn'
function does return [-Werror]
 }
 ^

Unlike Solaris, Linux, and e.g. macOS 10.12, the Mac OS 10.7 <setjmp.h> (or
<i386/setjmp.h>, to be exact) doesn't declare longjmp noreturn, as can be seen
in the following example:

$ cat lj-nr.c 
#include <setjmp.h>

static jmp_buf eof_buf;

void unexpected_eof (void) __attribute__((__noreturn__));

void
unexpected_eof (void)
{
  longjmp (eof_buf, 1);
}

gcc 6.1 compiles it without error, while

$ ./trunk/10.7-gcc/build/prev-gcc/xgcc -B ./trunk/10.7-gcc/build/prev-gcc/ -c
~/lj-nr.c
/homes/ro/lj-nr.c: In function 'unexpected_eof':
/homes/ro/lj-nr.c:11:1: warning: 'noreturn' function does return
 }
 ^

This is obviously caused by

2016-08-03  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        PR middle-end/71876
        * calls.c (special_function_p): Remove special handling of
        "setjmp_syscall", "qsetjmp", "longjmp", "siglongjmp" and the
        prefix "__x".  Recognize "savectx", "vfork" and "getcontext" only
        without prefix.  Remove potentially unsafe ECF_LEAF and ECF_NORETURN.

  Rainer