Re: How to find line number of illegal array element access

[Roderick Johnstone <rmj at ast dot cam dot ac dot uk>]

Bud, Tim

Thanks for your replies to my query.

For completeness, in case anyone else is reading this, I note that the 
correct compile line for the test program to enable line numbers to be 
found after the illegal array element access seems to be a synthesis of 
that suggested by Tim and Bud:

gfortran -static -g -fbounds-check a.f

Following this with the gdb prescription below gives the source code 
line number nicely.

Thanks again.

Roderick

Bud Davis wrote:
> here is a little example that shows how to do this
> until the runtime error can print out the file name
> and line number....
>
>
> [bdavis@gfortran ~]$ cat a.f
>        integer x(10)
>        do i = 1,25
>            x(i) = i
>        enddo
>        end
>  
> [bdavis@gfortran ~]$ /usr/local/bin/gfortran -static
> -fbounds-check a.f
> [bdavis@gfortran ~]$ gdb a.out
> GNU gdb 6.4
> Copyright 2005 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General
> Public License, and you are
> welcome to change it and/or distribute copies of it
> under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show
> warranty" for details.
> This GDB was configured as "i686-pc-linux-gnu"...Using
> host libthread_db library
> "/lib/tls/libthread_db.so.1".
>
> (gdb) break _gfortran_runtime_error
> Breakpoint 1 at 0x8048996: file
> ../../../gcc/libgfortran/runtime/error.c, line 328.
> (gdb) run
> Starting program: /home/bdavis/a.out
>
> Breakpoint 1, *_gfortrani_runtime_error (
>     message=0x80aaa2c "Array reference out of bounds")
>     at ../../../gcc/libgfortran/runtime/error.c:329
> 329     ../../../gcc/libgfortran/runtime/error.c: No
> such file or directory.
>         in ../../../gcc/libgfortran/runtime/error.c
> (gdb) bt
> #0  *_gfortrani_runtime_error (
>     message=0x80aaa2c "Array reference out of bounds")
>     at ../../../gcc/libgfortran/runtime/error.c:329
> #1  0x08048253 in MAIN__ ()
> #2  0x080482a7 in main (argc=1, argv=0xbfe4f0c4)
>     at ../../../gcc/libgfortran/fmain.c:18
> (gdb)
>
>
> HTH,
> bud davis
>
>
> --- Tim Prince <timothyprince@sbcglobal.net> wrote:
>
> > Roderick Johnstone wrote:
> > > Hi
> > >
> > > I've been using the -fbounds-check option to
> > gfortran to check for 
> > > illegal array element accesses at run time. Is it
> > possible to get the 
> > > source code line number where the illegal access
> > was made? If so how?
> > with -g, running under gdb?