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configure: check for __builtin_bswapXX()

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defines HAVE_BUILTIN_BSWAP16/32/64
updated endian_inl.h to have a non-configure fallback for gcc and clang
BSwap16() now uses __builtin_bswap16 if available

Change-Id: Ia04ee07b39303c4b247df96d84f298fb8a81f389
This commit is contained in:
James Zern
2014-07-04 16:56:41 -07:00
parent 6422e683af
commit 6781423b7d
2 changed files with 50 additions and 11 deletions
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20
configure.ac
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@ -112,6 +112,26 @@ AC_DEFUN([LIBCHECK_EPILOGUE],
CPPFLAGS=$SAVED_CPPFLAGS
LIBS=$SAVED_LIBS])
dnl === Check for gcc builtins
dnl === CHECK_FOR_BUILTIN([builtin], [param], [define])
dnl === links a C AC_LANG_PROGRAM, with <builtin>(<param>)
dnl === AC_DEFINE'ing <define> if successful.
AC_DEFUN([CHECK_FOR_BUILTIN],
[AC_LANG_PUSH([C])
AC_MSG_CHECKING([for $1])
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [$1($2)])],
[AC_MSG_RESULT([yes])
AC_DEFINE([$3], [1],
[Set to 1 if $1 is available])],
[AC_MSG_RESULT([no])]),
AC_LANG_POP])
dnl AC_CHECK_FUNC doesn't work with builtin's.
CHECK_FOR_BUILTIN([__builtin_bswap16], [1u << 15], [HAVE_BUILTIN_BSWAP16])
CHECK_FOR_BUILTIN([__builtin_bswap32], [1u << 31], [HAVE_BUILTIN_BSWAP32])
CHECK_FOR_BUILTIN([__builtin_bswap64], [1ull << 63], [HAVE_BUILTIN_BSWAP64])
dnl === Check for pthread support
AC_ARG_ENABLE([threading],
AS_HELP_STRING([--disable-threading],