Port better to POSIX hosts lacking _setjmp.

* configure.ac (HAVE__SETJMP, HAVE_SIGSETJMP): New symbols.
(_setjmp, _longjmp): Remove.
* src/lisp.h: Include <setjmp.h> here, since we use its symbols here.
All instances of '#include <setjmp.h>' removed, if the
only reason for the instance was because "lisp.h" was included.
(sys_jmp_buf, sys_setjmp, sys_longjmp): New symbols.
Unless otherwise specified, replace all uses of jmp_buf, _setjmp,
and _longjmp with the new symbols.  Emacs already uses _setjmp if
available, so this change affects only POSIXish hosts that have
sigsetjmp but not _setjmp, such as some versions of Solaris and
Unixware.  (Also, POSIX-2008 marks _setjmp as obsolescent.)
* src/image.c (_setjmp, _longjmp) [HAVE_PNG && !HAVE__SETJMP]: New macros.
(png_load_body) [HAVE_PNG]:
(PNG_LONGJMP) [HAVE_PNG && PNG_LIBPNG_VER < 10500]:
(PNG_JMPBUF) [HAVE_PNG && PNG_LIBPNG_VER >= 10500]:
Use _setjmp and _longjmp rather than sys_setjmp and sys_longjmp,
since PNG requires jmp_buf.  This is the only exception to the
general rule that we now use sys_setjmp and sys_longjmp.
This exception is OK since this code does not change the signal
mask or longjmp out of a signal handler.

Fixes: debbugs:12446

1 files changed, 6 insertions, 7 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 25cf03dfa2e..0bfbb0c88b1 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -24,7 +24,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <stdio.h>
 #include <limits.h>             /* For CHAR_BIT.  */
-#include <setjmp.h>
 
 #ifdef ENABLE_CHECKING
 #include <signal.h>             /* For SIGABRT. */
@@ -45,7 +44,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "frame.h"
 #include "blockinput.h"
 #include "termhooks.h"          /* For struct terminal.  */
-#include <setjmp.h>
+
 #include <verify.h>
 
 /* GC_CHECK_MARKED_OBJECTS means do sanity checks on allocated objects.
@@ -4764,14 +4763,14 @@ test_setjmp (void)
 {
   char buf[10];
   register int x;
-  jmp_buf jbuf;
+  sys_jmp_buf jbuf;
 
   /* Arrange for X to be put in a register.  */
   sprintf (buf, "1");
   x = strlen (buf);
   x = 2 * x - 1;
 
-  _setjmp (jbuf);
+  sys_setjmp (jbuf);
   if (longjmps_done == 1)
     {
       /* Came here after the longjmp at the end of the function.
@@ -4796,7 +4795,7 @@ test_setjmp (void)
   ++longjmps_done;
   x = 2;
   if (longjmps_done == 1)
-    _longjmp (jbuf, 1);
+    sys_longjmp (jbuf, 1);
 }
 
 #endif /* not GC_SAVE_REGISTERS_ON_STACK && not GC_SETJMP_WORKS */
@@ -4902,7 +4901,7 @@ mark_stack (void)
   /* jmp_buf may not be aligned enough on darwin-ppc64 */
   union aligned_jmpbuf {
     Lisp_Object o;
-    jmp_buf j;
+    sys_jmp_buf j;
   } j;
   volatile bool stack_grows_down_p = (char *) &j > (char *) stack_base;
 #endif
@@ -4938,7 +4937,7 @@ mark_stack (void)
     }
 #endif /* GC_SETJMP_WORKS */
 
-  _setjmp (j.j);
+  sys_setjmp (j.j);
   end = stack_grows_down_p ? (char *) &j + sizeof j : (char *) &j;
 #endif /* not GC_SAVE_REGISTERS_ON_STACK */
 #endif /* not HAVE___BUILTIN_UNWIND_INIT */