2 dnl Copyright (C) 2010 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_TANL],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 dnl Persuade glibc <math.h> to declare tanl().
11 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
14 AC_CACHE_CHECK([whether tanl() can be used without linking with libm],
15 [gl_cv_func_tanl_no_libm],
19 [[#ifndef __NO_MATH_INLINES
20 # define __NO_MATH_INLINES 1 /* for glibc */
24 [[return tanl (x) > 0.4;]])],
25 [gl_cv_func_tanl_no_libm=yes],
26 [gl_cv_func_tanl_no_libm=no])
28 if test $gl_cv_func_tanl_no_libm = no; then
29 AC_CACHE_CHECK([whether tanl() can be used with libm],
30 [gl_cv_func_tanl_in_libm],
36 [[#ifndef __NO_MATH_INLINES
37 # define __NO_MATH_INLINES 1 /* for glibc */
41 [[return tanl (x) > 0.4;]])],
42 [gl_cv_func_tanl_in_libm=yes],
43 [gl_cv_func_tanl_in_libm=no])
46 if test $gl_cv_func_tanl_in_libm = yes; then
50 if test $gl_cv_func_tanl_no_libm = yes \
51 || test $gl_cv_func_tanl_in_libm = yes; then
52 dnl Also check whether it's declared.
53 dnl MacOS X 10.3 has tanl() in libc but doesn't declare it in <math.h>.
54 AC_CHECK_DECL([tanl], , [HAVE_DECL_TANL=0], [#include <math.h>])
60 AC_REQUIRE([gl_FUNC_ISNANL])
61 AC_REQUIRE([gl_FUNC_FLOOR])
62 AC_REQUIRE([gl_FUNC_FLOORL])
63 dnl Append $ISNANL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
64 case " $TANL_LIBM " in
65 *" $ISNANL_LIBM "*) ;;
66 *) TANL_LIBM="$TANL_LIBM $ISNANL_LIBM" ;;
68 dnl Append $FLOOR_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
69 case " $TANL_LIBM " in
71 *) TANL_LIBM="$TANL_LIBM $FLOOR_LIBM" ;;
73 dnl Append $FLOORL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
74 case " $TANL_LIBM " in
75 *" $FLOORL_LIBM "*) ;;
76 *) TANL_LIBM="$TANL_LIBM $FLOORL_LIBM" ;;