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Clean up bswap32 autoconf macro. 

Improve 'checking' message and don't hog the cache namespace.

Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
This commit is contained in:
Ralph Giles 2014-11-04 11:59:53 -08:00 committed by Erik de Castro Lopo
parent 7a671e7c41
commit 87408b3661
1 changed files with 4 additions and 4 deletions
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8
m4/bswap.m4
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@ -36,16 +36,16 @@ dnl Dtermine whether the compiler has the __builtin_bswap32() intrinsic which
dnl is likely to be present for most versions of GCC as well as Clang.
AC_DEFUN([XIPH_C_BSWAP32],
[AC_CACHE_CHECK(has bswap32 instrinsic,
ac_cv_c_bswap,
[AC_CACHE_CHECK(for bswap32 instrinsic,
ac_cv_c_bswap32,
# Initialize to no
ac_cv_c_bswap=no
ac_cv_c_bswap32=no
HAVE_BSWAP32=0
[AC_TRY_LINK([],
return __builtin_bswap32 (0) ;,
ac_cv_c_bswap=yes
ac_cv_c_bswap32=yes
HAVE_BSWAP32=1
)]
AC_DEFINE_UNQUOTED(HAVE_BSWAP32, ${HAVE_BSWAP32},