diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 8f5a183dde..75ed9256d9 100644 --- a/configure.ac +++ b/configure.ac @@ -850,7 +850,21 @@ AC_CHECK_DECLS([bswap_16, bswap_32, bswap_64],,, #include <byteswap.h> #endif]) -AC_CHECK_DECLS([__builtin_clz, __builtin_clzl, __builtin_clzll]) +AC_MSG_CHECKING(for __builtin_clzl) +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[ + (void) __builtin_clzl(0); + ]])], + [ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_BUILTIN_CLZL, 1, [Define this symbol if you have __builtin_clzl])], + [ AC_MSG_RESULT(no)] +) + +AC_MSG_CHECKING(for __builtin_clzll) +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[ + (void) __builtin_clzll(0); + ]])], + [ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_BUILTIN_CLZLL, 1, [Define this symbol if you have __builtin_clzll])], + [ AC_MSG_RESULT(no)] +) dnl Check for malloc_info (for memory statistics information in getmemoryinfo) AC_MSG_CHECKING(for getmemoryinfo) |