[RFA/Darwin] Fix starting address scan for binary with only one section

  When binary has only one section, bfd_mach_o_scan_start_address
do not calculate properly starting address.

This patch fixes it.

gdb/ChangeLog:

        * mach-o.c (bfd_mach_o_scan_start_address): Handle binary
        with only one section.
---
 bfd/mach-o.c  | 2 +-
 gdb/ChangeLog | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)
  

On 2018-03-01 12:15, Xavier Roirand wrote:
> When binary has only one section, bfd_mach_o_scan_start_address
> do not calculate properly starting address.
> 
> This patch fixes it.
> 
> gdb/ChangeLog:
> 
>         * mach-o.c (bfd_mach_o_scan_start_address): Handle binary
>         with only one section.
> ---
>  bfd/mach-o.c  | 2 +-
>  gdb/ChangeLog | 6 ++++++
>  2 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/bfd/mach-o.c b/bfd/mach-o.c
> index f26be0c73e..3312882e16 100644
> --- a/bfd/mach-o.c
> +++ b/bfd/mach-o.c
> @@ -4827,7 +4827,7 @@ bfd_mach_o_scan_start_address (bfd *abfd)
>  	thr = &cmd->command.thread;
>  	break;
>        }
> -    else if (cmd->type == BFD_MACH_O_LC_MAIN && mdata->nsects > 1)
> +    else if (cmd->type == BFD_MACH_O_LC_MAIN && mdata->nsects >= 1)
>        {
>  	bfd_mach_o_main_command *main_cmd = &cmd->command.main;
>  	bfd_mach_o_section *text_sect = mdata->sections[0];
> diff --git a/gdb/ChangeLog b/gdb/ChangeLog
> index 59265157b4..087cf53775 100644
> --- a/gdb/ChangeLog
> +++ b/gdb/ChangeLog
> @@ -1,3 +1,9 @@
> +2018-03-01  Tristan Gingold  <gingold@adacore.com>
> +
> +	Pushed by Xavier Roirand <roirand@adacore.com>
> +	* mach-o.c (bfd_mach_o_scan_start_address): Handle binary
> +	with only one section.
> +
>  2018-02-28  Sergio Durigan Junior  <sergiodj@redhat.com>
>  	    Simon Marchi  <simon.marchi@polymtl.ca>

Makes sense, please push.

Thanks!

Simon