Mike Stump <mikest...@comcast.net> writes:
> On May 4, 2011, at 5:08 AM, Rainer Orth wrote:
>> The following patch is a prerequisite for making
>>
>> [lto, testsuite] Don't use visibility on targets that don't support it
>> (PR lto/47334)
>> http://gcc.gnu.org/ml/gcc-patches/2011-04/msg00295.html
>
>> -# define USE_LINKONCE_INDIRECT (SUPPORTS_ONE_ONLY)
>> +# define USE_LINKONCE_INDIRECT (SUPPORTS_ONE_ONLY) && !TARGET_MACHO
>
> Generally speaking, we don't litter the backend with things like this.
> We consider this trashy, and we limit the trash to config/...
>
> Now, if you invent a feature (bug) for which this is really testing,
> and used it instead here, and then put that into the darwin.h file or
> into an as autoconf test, I think it would be fine. Ok with that
> version. If a build/configure/visibility person wants to object or
> insist on a better way to do what you want to do, I'd defer to them.
The problem is the assumption that HAVE_GAS_HIDDEN implies that the
assembler supports the .hidden mnemonic, not visibility in general,
which is no longer true now.
Unfortunately, one cannot use targetm.asm_out.assemble_visibility in
dwarf2asm.c (dw2_output_indirect_constant_1) since the former expects a
tree arg, not an arbitrary string.
The cleanest way to account for this seems to allow overriding
USE_LINKONCE_INDIRECT in target headers (darwin.h in this case).
If Jason or Richard consider this appropriate, I'll modify the patch
accordingly and apply after retesting.
Rainer
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Rainer Orth, Center for Biotechnology, Bielefeld University
