diff options
Diffstat (limited to 'm4/lrintf.m4')
| -rw-r--r-- | m4/lrintf.m4 | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/m4/lrintf.m4 b/m4/lrintf.m4 new file mode 100644 index 00000000..4ea74b58 --- /dev/null +++ b/m4/lrintf.m4 @@ -0,0 +1,27 @@ +dnl @synopsis AC_C99_FUNC_LRINTF +dnl +dnl Check whether C99's lrintf function is available. +dnl @version 1.1 +dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com> +dnl +dnl Permission to use, copy, modify, distribute, and sell this file for any +dnl purpose is hereby granted without fee, provided that the above copyright +dnl and this permission notice appear in all copies. No representations are +dnl made about the suitability of this software for any purpose. It is +dnl provided "as is" without express or implied warranty. +dnl +AC_DEFUN([AC_C99_FUNC_LRINTF], +[AC_CACHE_CHECK(for lrintf, + ac_cv_c99_lrintf, +[AC_TRY_COMPILE([ +#define _ISOC9X_SOURCE 1 +#define _ISOC99_SOURCE 1 +#define __USE_ISOC99 1 +#define __USE_ISOC9X 1 +#include <math.h>], +[ int value = lrintf (0.432) ; ], ac_cv_c99_lrintf=yes, ac_cv_c99_lrintf=no)]) +if test $ac_cv_c99_lrintf = yes; then + AC_DEFINE(HAVE_LRINTF, 1, + [Define if you have C99's lrintf function.]) +fi +])# AC_C99_LRINTF |