Re: [PATCH] Function is_elf_target.

[Mark Kettenis <mark.kettenis@xs4all.nl>]

> From: Nicolas Blanc <nicolas.blanc@intel.com>
> Date: Fri, 27 Sep 2013 16:08:23 +0200
> 
> 2013-27-09  Nicolas Blanc  <nicolas.blanc@intel.com>
> 
> gdb/testsuite
> 	* lib/gdb.exp (is_elf_target): New function.
> 
> Signed-off-by: Nicolas Blanc <nicolas.blanc@intel.com>
> ---
> 
> Hi Mark,
> 
> I am sending this patch in response to <http://sourceware.org/ml/gdb-patches/2013-09/msg00933.html>.
> 
> Some reviewers prefer a white list whereas others prefer a black list. So it looks like the right approach is
> to compile a file and check if it is ELF.
> 
> Please let me know if this change would be acceptable to you.

That's even better!

>  gdb/testsuite/lib/gdb.exp |   39 +++++++++++++++++++++++++++++++++++++++
>  1 files changed, 39 insertions(+), 0 deletions(-)
> 
> diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
> index 5e3331a..df83634 100644
> --- a/gdb/testsuite/lib/gdb.exp
> +++ b/gdb/testsuite/lib/gdb.exp
> @@ -1796,6 +1796,45 @@ proc supports_reverse {} {
>      return 0
>  }
>  
> +# Return 1 if target is ELF.
> +gdb_caching_proc is_elf_target {
> +    set me "is_elf_target"
> +
> +    set src [standard_temp_file is_elf_target[pid].c]
> +    set obj [standard_temp_file is_elf_target[pid].o]
> +
> +    set fp_src [open $src "w"]
> +    puts $fp_src "int dummy () {return 0;}"
> +    close $fp_src
> +
> +    verbose "$me:  compiling testfile $src" 2
> +    set lines [gdb_compile $src $obj object {quiet}]
> +
> +    file delete $src
> +
> +    if ![string match "" $lines] then {
> +	verbose "$me:  testfile compilation failed, returning 0" 2
> +	return 0
> +    }
> +
> +    set fp_obj [open $obj "r"]
> +    fconfigure $fp_obj -translation binary
> +    set data [read $fp_obj]
> +    close $fp_obj
> +
> +    file delete $obj
> +
> +    set ELFMAG "\u007FELF"
> +
> +    if {[string compare -length 4 $data $ELFMAG] != 0} {
> +	verbose "$me:  returning 0" 2
> +	return 0
> +    }
> +
> +    verbose "$me:  returning 1" 2
> +    return 1
> +}
> +
>  # Return 1 if target is ILP32.
>  # This cannot be decided simply from looking at the target string,
>  # as it might depend on externally passed compiler options like -m64.
> -- 
> 1.7.6.5
> 
>