gdb/621: problem with macro tables for automatically generated source files

[carlton at math dot stanford dot edu]

>Number:         621
>Category:       gdb
>Synopsis:       problem with macro tables for automatically generated source files
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jul 30 17:18:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     carlton@math.stanford.edu
>Release:        GNU gdb 2002-07-30-cvs
>Organization:
>Environment:
uname -a:
Linux jackfruit.Stanford.EDU 2.4.18-5 #1 Mon Jun 10 15:31:48 EDT 2002 i686 unknown
gcc -v:
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs
Configured with: ../gcc-3.1/configure --enable-languages=c++
Thread model: single
gcc version 3.1
This GDB was configured as "i686-pc-linux-gnu".
>Description:
I've compiled a program,one of whose source files, 'main.cc', was generating automatically from another file 'main.k' by some sort of magic tool.  It's compiled with GCC 3.1 with -g3 (and with -gdwarf-2, but I think that's automatic on my system.)

When I run GDB on this and try to do much of anything, I get an internal error complaining that:

macroscope.c:48: gdb-internal-error: 
the symtab `main.k' refers to a preprocessor macro table which doesn't
have any record of processing a file by that name.

An internal GDB error was detected.  This may make further
debugging unreliable.  Quit this debugging session? (y or n) y

Basically, as far as I can tell, the code in GDB for inspecting macro tables assumes that all files referenced are either the original source code or files that were #included; files that are referenced via directives like

  #line 28 "main.k"

make the macro table code in GDB unhappy.

I don't know what tool was used to generate "main.cc" out of "main.k"; I doubt it would be hard to reproduce this using examples from flex or bison or whatever.

>How-To-Repeat:
Unpack the files from PR gdb/574.  Then, using GCC-3.1 as your compiler, do:

$ g++ -gdwarf-2 -g3 *.cc
$ gdb a.out
(gdb) b main
(gdb) r
(gdb) n
(gdb) p *e

You should get an error message saying:

macroscope.c:48: gdb-internal-error: 
the symtab `main.k' refers to a preprocessor macro table which doesn't
have any record of processing a file by that name.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: