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From:	Martin Str|mberg <ams AT father DOT ludd DOT luth DOT se>
Subject:	Re: bison 1.32 crashing
Newsgroups:	comp.os.msdos.djgpp
References:	<20020216105058 DOT A5049 AT kendall DOT sfbr DOT org>
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Date:	17 Feb 2002 11:30:16 GMT
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JT Williams <jeffw AT darwin DOT sfbr DOT org> wrote:
: Bison 1.32 wordlessly crashes on startup with the following trace; this
: is with DOS 5.0, stock djdev 2.03, and either bash 2.04 or command.com.
: The very same .y file compiles without problems using bison 1.30.  It also
: compiles okay with bison 1.28, although in this case some of the `#line'
: directives written to y_tab.c are incomplete (can be fixed by hand).
: If it helps, I also found that bison 1.30 will work fine with the
: bison.hairy and bison.simple supplied with bison 1.32.

: % bison --version
: bison (GNU Bison) 1.32

: Copyright 1984, 1986, 1989, 1992, 2000, 2001, 2002
: Free Software Foundation, Inc.
: This is free software; see the source for copying conditions.  There is NO
: warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

: % bison -d -y hoc.y
: Exiting due to signal SIGSEGV
: Page fault at eip=000f34e9, error=0004
: eax=0000000c ebx=00000004 ecx=00000000 edx=00000000 esi=0018a084 edi=0010952c
: ebp=001894c8 esp=001894c4 program=/djgpp/bin/bison.exe
: cs: sel=00e7  base=101c0000  limit=0018ffff
: ds: sel=00ef  base=101c0000  limit=0018ffff
: es: sel=00ef  base=101c0000  limit=0018ffff
: fs: sel=00cf  base=00027640  limit=0000ffff
: gs: sel=00ff  base=00000000  limit=0010ffff
: ss: sel=00ef  base=101c0000  limit=0018ffff
: App stack: [0018952c..0010952c]  Exceptn stack: [00109480..00107540]

: Call frame traceback EIPs:
:   0x000f34e9
:   0x00006ee9
:   0x0000a503
:   0x000f2098

This is easily preproduced with expr.y from djgpp libc cvs.

Symify points to getargs.c, line 217 (copied by hand):

	case 'd':
	  /* Here, the -d and --defines ... */
	  defines_flag = 1;
	  spec_defines_file = AS_FILE_NAME (optarg); /* Line 217. */
	  break;

optarg is NULL here.

This is from bison 1.32. It looks like that I have bison 1.28
installed on this machine that runs plain DOZE, if it might matter.


Right,

						MartinS

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