[Ffmpeg-devel] [PATCH] Configure fails on Intel OS X

Nigel Pearson nigel
Mon Jul 24 02:12:46 CEST 2006

Purpose: Fix incorrect configure script exit on Intel OS X
Applies: SVN r5816
Testing: Patch has been in place in MythTV for 4 months
Authors: Mino Taoyama, Nigel Pearson

Discussion: OS X has no memalign(). The malloc() man page says:
      The malloc(), calloc(), valloc(), and realloc() functions allocate 
      ory.  The allocated memory is aligned such that it can be used for 
      data type, including AltiVec-related types.

The patch simply skips the MMX/SSE and memalign() check
when running on OS X/Darwin. An alternative would be to
set memalignhack on this OS, but I think that generates
some extra, un-needed, code.

% svn diff configure | tee patch.osxintel-1.diff
Index: configure
--- configure   (revision 5816)
+++ configure   (working copy)
@@ -1915,7 +1915,8 @@
      check_func memalign || _memalign="no"

-if test "$_memalign" = "no" -a "$mmx" = "yes" -a "$memalignhack" != 
"yes"; then
+if test "$_memalign" = "no" -a "$mmx" = "yes" -a \
+        "$memalignhack" != "yes" -a "$darwin" != "yes" ; then
      die "Error, no memalign() but SSE enabled, disable it or use 

Nigel Pearson, nigel at ind.tansu.com.au|"Beware - I am a carrier
Telstra Net. Eng., Sydney, Australia |          of surrealism"
Office: 9202 3900    Fax:  9261 3912 |       D  A
Mobile: 0408 664435  Home: 9792 6998 |       L  I
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