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 ------ */ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
