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[RFC][PATCH][ld][testsuite] Add -ffat-lto-objects option to some ld tests

H.J. Lu hjl.tools@gmail.com
Wed Nov 27 09:15:00 GMT 2013 
On Tue, Nov 26, 2013 at 7:00 AM, Kyrill Tkachov <kyrylo.tkachov@arm.com> wrote:
> On 26/11/13 14:58, H.J. Lu wrote:
>>
>> On Tue, Nov 26, 2013 at 6:55 AM, Kyrill Tkachov <kyrylo.tkachov@arm.com>
>> wrote:
>>>
>>> On 26/11/13 14:36, H.J. Lu wrote:
>>>>
>>>> On Tue, Nov 26, 2013 at 6:32 AM, Kyrill Tkachov <kyrylo.tkachov@arm.com>
>>>> wrote:
>>>>>
>>>>> Hi all,
>>>>>
>>>>> I'm seeing some ld testsuite failures on arm-none-linux-gnueabi and
>>>>> aarch64-none-linux-gnu after a recent gcc commit (r205065) that set
>>>>> -fno-fat-lto-objects as the default:
>>>>>
>>>>> PASS->FAIL: LTO 3 symbol
>>>>> PASS->FAIL: PR ld/12758
>>>>> PASS->FAIL: PR ld/12760
>>>>> PASS->FAIL: PR ld/13183
>>>>>
>>>>> It seems that these tests need -ffat-lto-objects, at least on arm and
>>>>> aarch64, but I'm not sure I understand the structure of these ld tests
>>>>> well.
>>>>>
>>>>> Could someone please comment on whether this is the correct approach?
>>>>> CC'ing H.J. since he wrote the lto.exp file.
>>>>>
>>>> Does -ffat-lto-objects always work when -flto is supported?
>>>> If yes, OK for trunk.
>>>
>>>
>>> The gcc manual says about -ffat-lto-objects: " This option is effective
>>> only
>>> when compiling with -flto and is ignored at link time".
>>> I'd think that it's supposed to always work with -flto.
>>>
>> Was -ffat-lto-objects added together with -flto?
>
> Hmmm... it seems not. -ffat-lto-objects exists in 4.7 but not in 4.6. -flto
> was added in 4.6.
>

Please add  -ffat-lto-objects to check_lto_available.
Then you can use it in lto.exp.

Thanks.

-- 
H.J.
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