The following reply was made to PR gdb/2129; it has been noted by GNATS.

From: Daniel Jacobowitz <drow@false.org>
To: stephen.branch@galileo.com
Cc: gdb-gnats@sources.redhat.com
Subject: Re: gdb/2129: data moved into char array corrupts DWARF expression
Date: Thu, 25 May 2006 13:13:18 -0400

 On Thu, May 25, 2006 at 05:01:55PM -0000, stephen.branch@galileo.com wrote:
 > 4: &Bcet = dwarf2_read_address: Corrupted DWARF expression.
 > Disabling display 4 to avoid infinite recursion.
 
 Can you supply the object file for table999.prolog.c, or even better, a
 fully linked executable that shows the problem?  Exactly
 reproducing this sort of problem can depend on everything from the
 compiler being used to the command line options; we need to work out if
 the debug info is bad or if gdb is confused.
 
 > (gdb) x/20c 0xf8d3848
 > 0xf8d3848 <bcet_prologStringArea1>:     48 '0'  48 '0'  48 '0'  48 '0'  48 '0'  48 '0'  48 '0'  48 '0'
 > 0xf8d3850 <bcet_prologStringArea1+8>:   0 '\0'  0 '\0'  0 '\0'  0 '\0'  0 '\0'  0 '\0'  0 '\0'  0 '\0'
 > 0xf8d3858 <bcet_prologStringArea1+16>:  0 '\0'  0 '\0'  0 '\0'  0 '\0'
 > (gdb) x/20c 0xfeef522c
 > 0xfeef522c:     48 '0'  48 '0'  48 '0'  48 '0'  48 '0'  48 '0'  48 '0'  48 '0'
 > 0xfeef5234:     12 '\f' 0 '\0'  0 '\0'  0 '\0'  1 '\001'        0 '\0'  -1 'ÿ'  -1 'ÿ'
 > 0xfeef523c:     0 '\0'  0 '\0'  0 '\0'  0 '\0'
 > 
 > 
 > Code in table999.prolog.c: (code being traced)
 > 
 >     593 char Bcet[8];
 >     594 char R6Bcet[8];
 >     595 char Supplier[5];
 >     596 char RuleNum[4];
 >     597 char FareTariff[3];
 >     598 char const *StringArea;
 > 
 >     652                 c_get_record1_v02_bcet(R1Ptr,R1SegNbr,&StringArea);
 >     653                 strncpy(Bcet,StringArea,sizeof(Bcet));        <- causes corruption of DWARF
 >     654                 c_get_supplier_code(FarePtr,&StringArea);
 >     655                 strncpy(Supplier,StringArea,sizeof(Supplier));
 > 
 > Code in record1.v02.prolog.c:
 > 
 >      60 char bcet_prologStringArea1[20];
 >      61 static char prologStringArea1[20];
 >      62 static char prologStringArea2[20];
 >      63 static char prologStringArea3[20];
 >      64 static char prologStringArea4[20];
 >      65 static char prologStringArea5[20];
 > 
 > 
 >     296 void c_get_record1_v02_bcet(struct R1Table *r1tp,
 >     297                             long segnbr,
 >     298                             char const **bcetOut)
 >     299 {
 >     300 char *bcet = bcet_prologStringArea1;				<-- originally the static copy (prologStringArea1),  this did not make a difference.
 >     301 struct record1_V02 *r1;
 >     302 
 >     303         *bcetOut = bcet_prologStringArea1;
 >     304         memset(bcet_prologStringArea1,0,sizeof(bcet_prologStringArea1));
 >     305 
 >     306         r1 = r1tp->R1;
 >     307         memcpy(bcet,r1->rec1.segment[segnbr].rbdtblno,sizeof(r1->rec1.segment[segnbr].rbdtblno));
 >     308         stripTrailingBlanks(bcet_prologStringArea1);
 >     309 }
 > >How-To-Repeat:
 > 
 > >Fix:
 > 
 > >Release-Note:
 > >Audit-Trail:
 > >Unformatted:
 > 
 
 -- 
 Daniel Jacobowitz
 CodeSourcery