Add new method to judge whether <altivec.h> is needed
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The original logic will use "typedef vector int t;" to judge
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whether <altivec.h> is needed. altivec.h contains the following
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statement:
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#if !defined(__APPLE_ALTIVEC__)
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#define vector __vector
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#define pixel __pixel
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#define bool
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#endif
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In gcc-4.3.3, __APPLE_ALTIVEC__ is not defined by compiler, neither
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as vector, pixel, and bool. In order to make "typedef vector int t;"
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pass the compilation, we need to include altivec.h.
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However in gcc-4.5.0, __APPLE_ALTIVEC__ is defined by compiler,
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so as vector, pixel, and bool. We could not judge whether
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altivec.h is needed by "typedef vector int t;".
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Here we include another statement "int tmp = __CR6_EQ;", in
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which __CR6_EQ is defined in altivec.h.
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Upstream-Status: Pending
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Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
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diff -ruN a/configure.in b/configure.in
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--- a/configure.ac 2010-09-14 20:55:42.399687663 +0800
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+++ b/configure.ac 2010-09-14 20:56:43.403204648 +0800
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@@ -79,11 +79,11 @@
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CFLAGS="$OPT_CFLAGS $TRY_CFLAGS $CFLAGS"
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AC_MSG_CHECKING([if <altivec.h> is needed])
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AC_TRY_COMPILE([],
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- [typedef vector int t;
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+ [typedef vector int t; int tmp = __CR6_EQ;
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vec_ld(0, (unsigned char *)0);],
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[have_altivec=yes; AC_MSG_RESULT(no)],
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[AC_TRY_COMPILE([#include <altivec.h>],
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- [typedef vector int t; vec_ld(0, (unsigned char *)0);],
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+ [typedef vector int t; int tmp = __CR6_EQ; vec_ld(0, (unsigned char *)0);],
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[AC_DEFINE([HAVE_ALTIVEC_H],,
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[Define to 1 if you have the <altivec.h> header.])
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have_altivec=yes; AC_MSG_RESULT(yes)],
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