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Date: Wed, 29 Mar 2006 01:23:00 -0000
From: Bob Rossi <bob_rossi@cox.net>
To: Nick Roberts <nickrob@snap.net.nz>
Cc: gdb@sources.redhat.com
Subject: Re: GDB command "info source"
Message-ID: <20060328230121.GG9767@brasko.net>
Mail-Followup-To: Nick Roberts <nickrob@snap.net.nz>, 	gdb@sources.redhat.com
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On Wed, Mar 29, 2006 at 09:59:35AM +1200, Nick Roberts wrote:
> 
> Starting GNU gdb 6.4.50.20060325-cvs, I get the following:
> 
>   nickrob/24 src/gdb/gdb -q myprog
>   Using host libthread_db library "/lib/tls/libthread_db.so.1".
> 
>   (gdb) help info source
>   Information about the current source file.
> 
>   (gdb) info source
>   No current source file.
> 
>   (gdb) b 10
>   Breakpoint 1 at 0x8048498: file myprog.c, line 10.
> 
> So GDB seems to assume myprog.c is current, but doesn't share that information
> with the user until now...
> 
>   (gdb) info source
>   Current source file is myprog.c
>   Compilation directory is /home/nickrob
>   Source language is c.
>   Compiled with DWARF 2 debugging format.
>   Includes preprocessor macro info.
> 
> 
> In contrast using MI, GDB does yield this information immediately:
> 
>   nickrob/25 src/gdb/gdb -q -i=mi myprog
>   ~"Using host libthread_db library \"/lib/tls/libthread_db.so.1\".\n"
>   (gdb)
>   -file-list-exec-source-file
>   ^done,line="58",file="myprog.c",fullname="/home/nickrob/myprog.c"
>   (gdb)

Yes, that's because of this line
  mi-cmd-file.c:72   set_default_source_symtab_and_line();

It's a special case for finding the default file. When using annotate 2,
I do 'info line' followed by 'info source'.

> Shouldn't "info source" do the same?
> 
> About -file-list-exec-source-file the manual says:
> 
>   There's no GDB command which directly corresponds to this one.
> 
> but apart from this difference, they seem pretty similar.  Also
> -file-list-exec-source-files could be likened to "info sources".
> 
> WDYT?

They are similar but not the same. So I don't know.

Bob Rossi