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1 | dnl @synopsis AC_C99_FUNC_LRINTF |
2 | dnl | |
3 | dnl Check whether C99's lrintf function is available. | |
4 | dnl @version 1.3 Feb 12 2002 | |
5 | dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com> | |
6 | dnl | |
7 | dnl Permission to use, copy, modify, distribute, and sell this file for any | |
8 | dnl purpose is hereby granted without fee, provided that the above copyright | |
9 | dnl and this permission notice appear in all copies. No representations are | |
10 | dnl made about the suitability of this software for any purpose. It is | |
11 | dnl provided "as is" without express or implied warranty. | |
12 | dnl | |
13 | AC_DEFUN([AC_C99_FUNC_LRINTF], | |
14 | [AC_CACHE_CHECK(for lrintf, | |
15 | ac_cv_c99_lrintf, | |
16 | [ | |
17 | lrintf_save_CFLAGS=$CFLAGS | |
18 | CFLAGS="-lm" | |
19 | AC_TRY_LINK([ | |
20 | #define _ISOC9X_SOURCE 1 | |
21 | #define _ISOC99_SOURCE 1 | |
22 | #define __USE_ISOC99 1 | |
23 | #define __USE_ISOC9X 1 | |
24 | ||
25 | #include <math.h> | |
26 | ], if (!lrintf(3.14159)) lrintf(2.7183);, ac_cv_c99_lrintf=yes, ac_cv_c99_lrintf=no) | |
27 | ||
28 | CFLAGS=$lrintf_save_CFLAGS | |
29 | ||
30 | ]) | |
31 | ||
32 | if test "$ac_cv_c99_lrintf" = yes; then | |
33 | AC_DEFINE(HAVE_LRINTF, 1, | |
34 | [Define if you have C99's lrintf function.]) | |
35 | fi | |
36 | ])# AC_C99_FUNC_LRINTF | |
37 |