[patch] gdb.exp (INTERNAL_GDBFLAGS): Don't override value provided by user.

[Michael Snyder]

Doug Evans wrote:
> Hi.
> 
> I will check this in tomorrow if there are no objections.

How will this affect me?

> It is useful to run the testsuite on the installed gdb.
> e.g. make check RUNTESTFLAGS=GDB=/usr/bin/gdb
> 
> When testing the installed gdb one would like to test exactly what the
> user runs.  For environments that have a system.gdbinit (gdb was configured
> with --with-system-gdbinit) that means using the installed system.gdbinit
> and not anything from the source/build tree.
> In order to do this one either needs to not pass "-nx" when dejagnu starts gdb
> or pass "-x /path/to/system.gdbinit" in addition to -nx.
> I like the former as it's closer to what the user does.
> 
> There is also the issue of not loading ~/.gdbinit when running the
> testsuite, but can be solved by pointing $HOME at a directory without
> a .gdbinit when running the testsuite.
> 
> [-nx also skips loading of $pwd/.gdbinit, but the testsuite build directory
> generally doesn't have one and that's good enough for me for now]
> 
> 2010-02-03  Doug Evans  <dje@google.com>
> 
> 	* gdb.exp (INTERNAL_GDBFLAGS): Don't override value provided by user.
> 
> Index: gdb.exp
> ===================================================================
> RCS file: /cvs/src/src/gdb/testsuite/lib/gdb.exp,v
> retrieving revision 1.135
> diff -u -p -r1.135 gdb.exp
> --- gdb.exp	14 Jan 2010 21:12:00 -0000	1.135
> +++ gdb.exp	4 Feb 2010 00:15:25 -0000
> @@ -54,7 +54,10 @@ if ![info exists GDBFLAGS] {
>  verbose "using GDBFLAGS = $GDBFLAGS" 2
>  
>  # INTERNAL_GDBFLAGS contains flags that the testsuite requires.
> -set INTERNAL_GDBFLAGS "-nw -nx"
> +global INTERNAL_GDBFLAGS
> +if ![info exists INTERNAL_GDBFLAGS] {
> +    set INTERNAL_GDBFLAGS "-nw -nx"
> +}
>  
>  # The variable gdb_prompt is a regexp which matches the gdb prompt.
>  # Set it if it is not already set.