diff options
| author | Nico Weber <thakis@chromium.org> | 2012-04-17 11:26:01 -0700 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2012-04-19 17:14:47 +0200 |
| commit | a4a88fd42c934b729f689be790b55df061ded1f8 (patch) | |
| tree | 5c6d56dcf34a82dda409dd38b99f211084712b5d /libavutil | |
| parent | b4043ef504b77c357d33ffa2be28ed1c4eeecf7f (diff) | |
Remove .rodata alignment kludge for Mach-O if a recent enough yasm is used.
Yasm was fixed in its r2161 and yasm 0.8.0 (Apr 2010) contained this fix.
Nasm was fixed in 2.06 (Jun 2009):
https://groups.google.com/group/alt.lang.asm/browse_thread/thread/fcc85bbc3745d893
I tested with yasm 0.7.99 and yasm 1.2.0.7, where this works fine.
I also tested with nasm. The nasm shipping with Xcode is too old to understand
ffmpeg's assembly, before and after the patch. Nasm 2.10 fails to compile
fft_mmx.asm on trunk with
libavcodec/x86/fft_mmx.asm:88: panic: section ".text" has already been specified with alignment 32, conflicts with new alignment of 16
but builds fine if I change the two alignment "16"s in x86inc.asm to "32". With this patch,
nasm 2.10 fails with
libavcodec/x86/fft_mmx.asm:39: panic: section ".rodata" has already been specified with alignment 32, conflicts with new alignment of 16
instead, but again builds fine with s/16/32/.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavutil')
| -rw-r--r-- | libavutil/x86/x86inc.asm | 37 |
1 files changed, 28 insertions, 9 deletions
diff --git a/libavutil/x86/x86inc.asm b/libavutil/x86/x86inc.asm index 7e389d0189..6b39f23a3b 100644 --- a/libavutil/x86/x86inc.asm +++ b/libavutil/x86/x86inc.asm @@ -60,19 +60,38 @@ ; and x264's strides are all positive), but is not guaranteed by the ABI. ; Name of the .rodata section. -; Kludge: Something on OS X fails to align .rodata even given an align attribute, -; so use a different read-only section. %macro SECTION_RODATA 0-1 16 - %ifidn __OUTPUT_FORMAT__,macho64 - SECTION .text align=%1 - %elifidn __OUTPUT_FORMAT__,macho - SECTION .text align=%1 - fakegot: - %elifidn __OUTPUT_FORMAT__,aout + ; Kludge: Something on OS X fails to align .rodata even given an align + ; attribute, so use a different read-only section. This has been fixed in + ; yasm 0.8.0 and nasm 2.6. + %ifdef __YASM_VERSION_ID__ + %if __YASM_VERSION_ID__ < 00080000h + %define NEED_MACHO_RODATA_KLUDGE + %endif + %elifdef __NASM_VERSION_ID__ + %if __NASM_VERSION_ID__ < 02060000h + %define NEED_MACHO_RODATA_KLUDGE + %endif + %endif + + %ifidn __OUTPUT_FORMAT__,aout section .text %else - SECTION .rodata align=%1 + %ifndef NEED_MACHO_RODATA_KLUDGE + SECTION .rodata align=%1 + %else + %ifidn __OUTPUT_FORMAT__,macho64 + SECTION .text align=%1 + %elifidn __OUTPUT_FORMAT__,macho + SECTION .text align=%1 + fakegot: + %else + SECTION .rodata align=%1 + %endif + %endif %endif + + %undef NEED_MACHO_RODATA_KLUDGE %endmacro ; aout does not support align= |