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

[Iain Sandoe]

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.

cheers
Iain