[FFmpeg-devel] Patch for Mac OS X assembly-language support in trunk/libavcodec/fft_altivec_s.S

[Paul Sterne]

The following features of the current fft_altivec_s.S code are incompatible
with Mac OS X:

-- attempt to reference external symbol ff_cos_tab without a leading
underscore.  The gcc compiler prepends underscore to all C-language symbols
on Mac OS X.
-- attempt to load r6 with address of locally defined symbol fft_data
through the global offset table.
-- attempt to load r12 with address of externally defined symbol ff_cos_tabs
through the global offset table.

gas-preprocessor.pl doesn't address these issues, and they can't easily be
addressed by gas-preprocessor.pl because the mach-o binary format requires
section-difference calculations instead of using the global offset table.

2010/7/18 M?ns Rullg?rd <mans at mansr.com>

> Paul Sterne <make4ppc at gmail.com> writes:
>
> > This patch adds support to *libavcodec/fft_altivec_s.S* for the Mac OS X
> ppc
> > and ppc64 architectures, which use the mach-o binary executable file
> format
> > instead of ELF.
> > ELF-only code is separated from mach-o-only code using *#ifdef
> __APPLE__*or
> > *#ifndef __APPLE__*
>
> This patch is unacceptable.  Using the gas-preprocessor, the current
> code compiles and runs (in emulator) under OSX.  I see no need for a
> patch.
>
> --
> M?ns Rullg?rd
> mans at mansr.com
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