[PING][PATCH][gdb/testsuite] Fix ada tests with -fPIE/-pie

[Tom de Vries <tdevries@suse.de>]

On 08-08-19 12:15, Tom de Vries wrote:
> On 07-08-19 17:27, Tom de Vries wrote:
>> On 07-08-19 16:18, Tom Tromey wrote:
>>>>>>>> "Tom" == Tom de Vries <tdevries@suse.de> writes:
>>> Tom> When running the gdb testsuite with target board unix/-fPIE/-pie, the
>>> Tom> resulting ada executables are not PIE executables, because gnatmake doesn't
>>> Tom> recognize -pie, and consequently doesn't pass it to gnatlink.
>>>
>>> Tom> Fix this by replacing "-pie" with "-largs -pie -margs" for ada test-cases in
>>> Tom> gdb_default_target_compile, and doing the same for -no-pie.
>>>
>>> I think this is a good idea overall.
>>>
>>> However, is gdb_default_target_compile still used?  And if so, by what
>>> path?
>> I'm using dejagnu 1.6.1, and that one does not have find_go_linker. So,
>> use_gdb_compile is set to 1 and we get:
>> ...
>> if {$use_gdb_compile} {
>>     catch {rename default_target_compile {}}
>>     rename gdb_default_target_compile default_target_compile
>> }
>> ...
>>
>>>  My understanding is that with a "new enough" dejagnu, it won't be
>>> used -- so some users might still see the old behavior.
>>>
>> AFAIU, yes. Hmm, that's not good.
>>
>>> Basically gdb_default_target_compile is all a big monkeypatching hack
>> /me reads https://en.wikipedia.org/wiki/Monkey_patch
>>
>>> and it would be way better to have some kind of more principled approach
>>> upstream.
>> Agreed.
>>
>>> I don't know what that would look like.  And of course to get
>>> there we'd probably need even more monkeypatching.
>> The following uses the approach taken in lib/cell.exp.
>>
>> Is this any better?
>>
> Updated rationale and ChangeLog entry.
> 
> OK for trunk?
> 

Ping.

Thanks,
- Tom

> 0001-gdb-testsuite-Fix-ada-tests-with-fPIE-pie.patch
> 
> [gdb/testsuite] Fix ada tests with -fPIE/-pie
> 
> When running the gdb testsuite with target board unix/-fPIE/-pie, the
> resulting ada executables are not PIE executables, because gnatmake doesn't
> recognize -pie, and consequently doesn't pass it to gnatlink.
> 
> Fix this by replacing "-pie" with "-largs -pie -margs" in
> target_compile_ada_from_dir, and doing the same for -no-pie.
> 
> Tested on x86_64-linux.
> 
> gdb/testsuite/ChangeLog:
> 
> 2019-08-08  Tom de Vries  <tdevries@suse.de>
> 
> 	PR testsuite/24888
> 	* lib/ada.exp (target_compile_ada_from_dir): Route -pie/-no-pie to
> 	gnatlink.
> 
> ---
>  gdb/testsuite/lib/ada.exp | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/gdb/testsuite/lib/ada.exp b/gdb/testsuite/lib/ada.exp
> index 1345c747c5..6a3fd33240 100644
> --- a/gdb/testsuite/lib/ada.exp
> +++ b/gdb/testsuite/lib/ada.exp
> @@ -19,11 +19,36 @@
>  
>  proc target_compile_ada_from_dir {builddir source dest type options} {
>      set saved_cwd [pwd]
> +
> +    global board
> +    set board [target_info name]
> +    set save_multilib_flag [board_info $board multilib_flags]
> +    set multilib_flag ""
> +    foreach op $save_multilib_flag {
> +	if { $op == "-pie" || $op == "-no-pie" } {
> +	    # Pretend gnatmake supports -pie/-no-pie, route it to
> +	    # linker.
> +	    append multilib_flag " -largs $op -margs"
> +	} else {
> +	    append multilib_flag " $op"
> +	}
> +    }
> +    if { $multilib_flag != "" } {
> +	unset_board_info "multilib_flags"
> +	set_board_info multilib_flags "$multilib_flag"
> +    }
> +
>      catch {
>          cd $builddir
>          return [target_compile $source $dest $type $options]
>      } result options
>      cd $saved_cwd
> +
> +    if { $save_multilib_flag != "" } {
> +	unset_board_info "multilib_flags"
> +	set_board_info multilib_flags $save_multilib_flag
> +    }
> +
>      return -options $options $result
>  }
>  
>