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, 22 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index b1b4dc8bbcd..fb59e9e24dc 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,25 @@
+2012-09-15  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Port better to POSIX hosts lacking _setjmp (Bug#12446).
+        * 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.)
+        * 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.
+
 2012-09-14  Paul Eggert  <eggert@cs.ucla.edu>
 
         * alloc.c [!SYSTEM_MALLOC && !SYNC_INPUT && HAVE_PTHREAD]: