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Re: [patch, build] Restore bootstrap in building libcc1 on darwin


On Thu, Dec 4, 2014 at 2:47 PM, Richard Biener
<richard.guenther@gmail.com> wrote:
> On Thu, Dec 4, 2014 at 2:43 PM, Iain Sandoe <iain@codesourcery.com> wrote:
>> Hi Rainer,
>>
>> On 4 Dec 2014, at 13:32, Rainer Orth wrote:
>>
>>> FX <fxcoudert@gmail.com> writes:
>>>
>>>> 10-days ping
>>>> This restores bootstrap on a secondary target, target maintainer is OK with
>>>> it. I think I need build maintainers approval, so please review.
>>>
>>> While in my testing, 64-bit Mac OS X 10.10.1 (x86_64-apple-darwin14.0.0)
>>> now bootstraps, but 32-bit (i386-apple-darwin14.0.0) does not:
>>>
>>> ld: illegal text-relocation to 'anon' in ../libiberty/pic/libiberty.a(regex.o) from '_byte_common_op_match_null_string_p' in ../libiberty/pic/libiberty.a(regex.o) for architecture i386
>>> collect2: error: ld returned 1 exit status
>>> make[3]: *** [libcc1.la] Error 1
>>> make[2]: *** [all] Error 2
>>> make[1]: *** [all-libcc1] Error 2
>>
>> For {i?86,ppc}-darwin* (i.e. m32 hosts) the PIC libiberty library is being incorrectly built.
>>
>> The default BOOT_CFLAGS are: -O2 -g -mdynamic-no-pic
>> the libiberty pic build appends: -fno-common (and not even -fPIC) [NB -fPIC _won't_ override -mdynamic-no-pic, so that's not a simple way out]
>>
>> This means that the PIC library is being built with non-pic relocs.
>>
>> I have a local hack to allow build to proceed on m32-host-darwin (which I can send to you if you would like it) - however, it's not really a suitable patch for trunk... and I've not had time recently to try and fix this.
>>
>> If you would like to raise a PR for this, I can append the analysis there.
>
> The libiberty PIC build shouldn't use BOOT_CFLAGS.  How does
> lto-plugin get around being built for the host but as a shared library?

That is, the mistake is probably adding -mdynamic-no-pic to BOOT_CFLAGS
rather than in more contained places when building files for the host
_binaries_.

Richard.

> Richard.
>
>> cheers
>> Iain
>>


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