[PATCH] gdb/testsuite/README: update default value of INTERNAL_GDBFLAGS

[Simon Marchi]

On 2022-02-19 18:40, Philippe Blain via Gdb-patches wrote:
> The INTERNAL_GDBFLAGS runtest variable was updated in 55c3ad88013
> ([gdb/testsuite] Prevent pagination in GDB_INTERNALFLAGS, 2020-10-26) to
> disable pagination, and in aae1c79a03a (PR python/12227..., 2010-12-07)
> to point to the data directory, but its default value mentioned in the
> testsuite's README was not kept up to date.
> 
> Update the README accordingly, and mention where the default value is
> set, so that it's easier for futur new contributors to check if the
> default mentioned in the README is still current.
> ---
> 
> Notes:
>     I noticed that while testing the fix for PR 24069, since I wanted
>     to use my '~/.gdbinit' with 'set startup-with-shell off' for all tests,
>     and found out that setting INTERNAL_GDBFLAGS to only '-nw' made some things
>     a little worse (as GDB was then missing '-data-directory').
>     
>     Meta note: when I sent this patch earlier (and messed-up my CCs) in [1], I was
>     confused by the fact that my CCs for Simon, Doug Evans and Tom de Vries were
>     not showing up on public-inbox, even in the "raw" view [2]. After a little
>     web search I think this is due to them setting the mailman "avoid duplicates"
>     setting [3].
>     
>     [1] https://pi.simark.ca/gdb-patches/20220219212442.18136-1-levraiphilippeblain@gmail.com/T/#u
>     [2] https://pi.simark.ca/gdb-patches/20220219212442.18136-1-levraiphilippeblain@gmail.com/raw
>     [3] https://wiki.list.org/DOC/Mailman%202.1%20Members%20Manual#A7.2_How_can_I_avoid_getting_duplicate_messages.3F_.28duplicates_option.29
> 
>  gdb/testsuite/README | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/gdb/testsuite/README b/gdb/testsuite/README
> index 7552774c78b..2d3f1c45966 100644
> --- a/gdb/testsuite/README
> +++ b/gdb/testsuite/README
> @@ -168,11 +168,14 @@ INTERNAL_GDBFLAGS
>  
>  Command line options passed to all GDB invocations.
>  
> -The default is "-nw -nx".
> +The default is set in lib/gdb.exp and is currently
> +"-nw -nx -data-directory /path/to/build/directory/gdb/data-directory -iex 'set height 0' -iex 'set width 0'".
>  
>  `-nw' disables any of the windowed interfaces.
>  `-nx' disables ~/.gdbinit, so that it doesn't interfere with
>  the tests.
> +`-data-directory` points the the data directory in the build directory
> +`-iex 'set {height,width} 0'` disables pagination

I think this should just say "see the default in lib/gdb.exp", and the
flags can be explained there.  That would avoid things getting out of
sync.

Still, your patch makes things better than they are now, so I think we
can push it in any case.

Simon