[PING^3][PATCH][gdb/testsuite] Fix ada tests with -fPIE/-pie

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

On 28-08-19 09:18, Tom de Vries wrote:
> On 21-08-19 09:15, Tom de Vries wrote:
>> 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?
>>>
>>
> 

Hi,

Ping^3.

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
>>>  }
>>>  
>>>