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Fix MinGW64 porting problem with _setjmp.

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Reported by Eli Zaretskii in:
http://lists.gnu.org/archive/html/emacs-devel/2014-01/msg01297.html
* image.c (FAST_SETJMP, FAST_LONGJMP): New macros, replacing
the old _setjmp and _longjmp.  All uses changed.
This commit is contained in:
Paul Eggert 2014-01-13 17:19:42 -08:00
parent c176054fe1
commit d1eaf34b2f
2 changed files with 23 additions and 13 deletions
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8
src/ChangeLog
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@ -1,3 +1,11 @@
2014-01-14 Paul Eggert <eggert@cs.ucla.edu>
Fix MinGW64 porting problem with _setjmp.
Reported by Eli Zaretskii in:
http://lists.gnu.org/archive/html/emacs-devel/2014-01/msg01297.html
* image.c (FAST_SETJMP, FAST_LONGJMP): New macros, replacing
the old _setjmp and _longjmp. All uses changed.
2014-01-13 Daniel Colascione <dancol@dancol.org>
* textprop.c (Fremove_list_of_text_properties): Correctly

28
src/image.c
View file

@ -5608,24 +5608,26 @@ init_png_functions (void)
#endif /* WINDOWSNT */
/* Possibly inefficient/inexact substitutes for _setjmp and _longjmp.
Do not use sys_setjmp, as PNG supports only jmp_buf. The _longjmp
substitute may munge the signal mask, but that should be OK here.
MinGW (MS-Windows) uses _setjmp and defines setjmp to _setjmp in
the system header setjmp.h; don't mess up that. */
#ifndef HAVE__SETJMP
# define _setjmp(j) setjmp (j)
# define _longjmp longjmp
/* Fast implementations of setjmp and longjmp. Although setjmp and longjmp
will do, POSIX _setjmp and _longjmp (if available) are often faster.
Do not use sys_setjmp, as PNG supports only jmp_buf.
It's OK if the longjmp substitute restores the signal mask. */
#ifdef HAVE__SETJMP
# define FAST_SETJMP(j) _setjmp (j)
# define FAST_LONGJMP _longjmp
#else
# define FAST_SETJMP(j) setjmp (j)
# define FAST_LONGJMP longjmp
#endif
#if (PNG_LIBPNG_VER < 10500)
#define PNG_LONGJMP(ptr) (_longjmp ((ptr)->jmpbuf, 1))
#if PNG_LIBPNG_VER < 10500
#define PNG_LONGJMP(ptr) FAST_LONGJMP ((ptr)->jmpbuf, 1)
#define PNG_JMPBUF(ptr) ((ptr)->jmpbuf)
#else
/* In libpng version 1.5, the jmpbuf member is hidden. (Bug#7908) */
#define PNG_LONGJMP(ptr) (fn_png_longjmp ((ptr), 1))
#define PNG_LONGJMP(ptr) fn_png_longjmp (ptr, 1)
#define PNG_JMPBUF(ptr) \
(*fn_png_set_longjmp_fn ((ptr), _longjmp, sizeof (jmp_buf)))
(*fn_png_set_longjmp_fn (ptr, FAST_LONGJMP, sizeof (jmp_buf)))
#endif
/* Error and warning handlers installed when the PNG library
@ -5810,7 +5812,7 @@ png_load_body (struct frame *f, struct image *img, struct png_load_context *c)
/* Set error jump-back. We come back here when the PNG library
detects an error. */
if (_setjmp (PNG_JMPBUF (png_ptr)))
if (FAST_SETJMP (PNG_JMPBUF (png_ptr)))
{
error:
if (c->png_ptr)