buildroot

[PATCH] fix altivec.h detection

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Patch from Gentoo:

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http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/media-libs/libmpeg2/files/libmpeg2-0.5.1-altivec.patch?revision=1.1&view=markup

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Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

--- a/configure.ac.bak  2010-05-25 17:12:14.756245990 +0000

+++ b/configure.ac  2010-05-25 17:11:51.629581723 +0000

@@ -79,11 +79,10 @@

         CFLAGS="$OPT_CFLAGS $TRY_CFLAGS $CFLAGS"

         AC_MSG_CHECKING([if <altivec.h> is needed])

         AC_TRY_COMPILE([],

-           [typedef vector int t;

-            vec_ld(0, (unsigned char *)0);],

+           [vector int t; t = vec_add(t,t);],

            [have_altivec=yes; AC_MSG_RESULT(no)],

            [AC_TRY_COMPILE([#include <altivec.h>],

-           [typedef vector int t; vec_ld(0, (unsigned char *)0);],

+           [vector int t; t = vec_add(t,t);],

            [AC_DEFINE([HAVE_ALTIVEC_H],,

                [Define to 1 if you have the <altivec.h> header.])

             have_altivec=yes; AC_MSG_RESULT(yes)],