I think the gs-gpl on ppc coredump showing up here is probably related
to the gs-esp on ppc coredump that I discuss in the attached message.
Regards,
Ian.
--- Begin Message ---
I have been investigating problems with gs that show up with gs-esp in
Ubuntu. There turns out to be a bug in gs which causes problems for
gs's memory management system.
For your edification I enclose the patch that I've just uploaded into
Ubuntu Breezy. I think something like this patch is likely to be
necessary for Debian gs's too.
The top of the patch, below, contains URLs for the references I
found. The core bug for which my patch is a workaround is recorded in
the gs bugzilla.
I hope you find this mail helpful. Thank you for your attention.
Ian.
diff -x '*~' -ruN ../orig/gs-esp-7.07.1/debian/changelog
gs-esp-7.07.1/debian/changelog
--- ../orig/gs-esp-7.07.1/debian/changelog 2005-08-30 18:56:12.000000000
+0100
+++ gs-esp-7.07.1/debian/changelog 2005-08-30 18:55:44.000000000 +0100
@@ -1,3 +1,30 @@
+gs-esp (7.07.1-9ubuntu5) breezy; urgency=low
+
+ * Fix coredumping bug on ppc: Ubuntu bugzilla:
+ http://bugzilla.ubuntu.com/show_bug.cgi?id=13771
+ This is the same issue as
+ http://bugs.ghostscript.com/show_bug.cgi?id=687643
+ http://bugs.ghostscript.com/show_bug.cgi?id=687730
+ discussed in
+ http://ghostscript.com/pipermail/gs-code-review/2004-September/004649.html
+ and probably the same as Debian bug #324796 and perhaps others in
+ Debian's gs-esp.
+
+ This bug is due to gs's incorrect assumption that (where ref is an
+ important struct inside gs) sizeof(ref) % alignof(jmp_buf) == 0. This
+ is not true on ppc and apparently not necessarily on Itanium either.
+
+ The `fix' I have applied is to wrap setjmp/longjmp up in macros which
+ arrange for jmp_buf to have alignment 1, as sketched out in the URLs
+ above. A previous attempt to fix it by padding ref out to the
+ alignment of jmp_buf failed and I don't know why; but I suspect other
+ unjustified assumptions in gs.
+
+ GhostScript's algorithms ought to be repaired not to assume
+ falsehoods.
+
+ -- Ian Jackson <[EMAIL PROTECTED]> Tue, 30 Aug 2005 18:55:44 +0100
+
gs-esp (7.07.1-9ubuntu4) breezy; urgency=low
* Rebuild for new C++ ABI
diff -x '*~' -ruN ../orig/gs-esp-7.07.1/src/genarch.c
gs-esp-7.07.1/src/genarch.c
--- ../orig/gs-esp-7.07.1/src/genarch.c 2003-08-19 16:32:25.000000000 +0100
+++ gs-esp-7.07.1/src/genarch.c 2005-08-30 18:46:40.000000000 +0100
@@ -28,7 +28,8 @@
*/
#include <string.h>
#include <time.h>
-#include <setjmp.h>
+
+#include "gsfix-setjmp.h"
/* We should write the result on stdout, but the original Turbo C 'make' */
/* can't handle output redirection (sigh). */
diff -x '*~' -ruN ../orig/gs-esp-7.07.1/src/gp_os2.c gs-esp-7.07.1/src/gp_os2.c
--- ../orig/gs-esp-7.07.1/src/gp_os2.c 2003-07-13 05:43:17.000000000 +0100
+++ gs-esp-7.07.1/src/gp_os2.c 2005-08-30 18:46:40.000000000 +0100
@@ -72,7 +72,7 @@
#ifdef __DLL__
/* use longjmp instead of exit when using DLL */
-#include <setjmp.h>
+#include "gsfix-setjmp.h"
extern jmp_buf gsdll_env;
#endif
diff -x '*~' -ruN ../orig/gs-esp-7.07.1/src/gsfix-setjmp.h
gs-esp-7.07.1/src/gsfix-setjmp.h
--- ../orig/gs-esp-7.07.1/src/gsfix-setjmp.h 1970-01-01 01:00:00.000000000
+0100
+++ gs-esp-7.07.1/src/gsfix-setjmp.h 2005-08-30 18:46:40.000000000 +0100
@@ -0,0 +1,35 @@
+#ifndef GSFIX_SETJMP_H
+#define GSFIX_SETJMP_H
+
+#include <setjmp.h>
+
+typedef struct {
+ char c;
+ jmp_buf j;
+} gsfix_jmp_buf_test;
+
+#define gsfix_jmp_buf_align ((size_t)&((gsfix_jmp_buf_test*)0)->j)
+
+typedef struct {
+ unsigned char stuff[sizeof(jmp_buf) + gsfix_jmp_buf_align];
+} gsfix_jmp_buf;
+
+#define gsfix_orig_jmp_buf jmp_buf
+#define gsfix_orig_setjmp(x) setjmp(x)
+#define gsfix_orig_longjmp(x,y) longjmp((x),(y))
+
+#undef jmp_buf
+#undef setjmp
+#undef longjmp
+
+#define jmp_buf gsfix_jmp_buf
+#define setjmp(x) (gsfix_orig_setjmp(find_jmp_buf((x))))
+#define longjmp(x,val) (gsfix_orig_longjmp(find_jmp_buf((x)),(val)))
+
+#define find_jmp_buf(gsfjb) \
+ ( \
+ ((size_t)(gsfjb).stuff + gsfix_jmp_buf_align) \
+ & ~(size_t)(gsfix_jmp_buf_align-1) \
+ )
+
+#endif /*GSFIX_SETJMP_H*/
diff -x '*~' -ruN ../orig/gs-esp-7.07.1/src/sdct.h gs-esp-7.07.1/src/sdct.h
--- ../orig/gs-esp-7.07.1/src/sdct.h 2002-04-23 12:58:47.000000000 +0100
+++ gs-esp-7.07.1/src/sdct.h 2005-08-30 18:46:40.000000000 +0100
@@ -21,7 +21,7 @@
#ifndef sdct_INCLUDED
# define sdct_INCLUDED
-#include <setjmp.h> /* for jmp_buf */
+#include "gsfix-setjmp.h" /* for jmp_buf */
/* ------ DCT filters ------ */
--- End Message ---
