2 dnl Copyright (C) 2010-2020 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_COSL],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
12 dnl Persuade glibc <math.h> to declare cosl().
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
16 AC_CACHE_CHECK([whether cosl() can be used without linking with libm],
17 [gl_cv_func_cosl_no_libm],
21 [[#ifndef __NO_MATH_INLINES
22 # define __NO_MATH_INLINES 1 /* for glibc */
25 long double (* volatile funcptr) (long double) = cosl;
27 [[return funcptr (x) > 0.4
28 || cosl (x) > 0.4;]])],
29 [gl_cv_func_cosl_no_libm=yes],
30 [gl_cv_func_cosl_no_libm=no])
32 if test $gl_cv_func_cosl_no_libm = no; then
33 AC_CACHE_CHECK([whether cosl() can be used with libm],
34 [gl_cv_func_cosl_in_libm],
40 [[#ifndef __NO_MATH_INLINES
41 # define __NO_MATH_INLINES 1 /* for glibc */
44 long double (* volatile funcptr) (long double) = cosl;
46 [[return funcptr (x) > 0.4
47 || cosl (x) > 0.4;]])],
48 [gl_cv_func_cosl_in_libm=yes],
49 [gl_cv_func_cosl_in_libm=no])
52 if test $gl_cv_func_cosl_in_libm = yes; then
56 if test $gl_cv_func_cosl_no_libm = yes \
57 || test $gl_cv_func_cosl_in_libm = yes; then
58 dnl Also check whether it's declared.
59 dnl Mac OS X 10.3 has cosl() in libc but doesn't declare it in <math.h>.
60 AC_CHECK_DECL([cosl], , [HAVE_DECL_COSL=0], [[#include <math.h>]])
64 dnl Find libraries needed to link lib/cosl.c, lib/sincosl.c, lib/trigl.c.
65 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
66 AC_REQUIRE([gl_FUNC_COS])
69 AC_REQUIRE([gl_FUNC_ISNANL])
70 AC_REQUIRE([gl_FUNC_FLOOR])
71 AC_REQUIRE([gl_FUNC_FLOORL])
72 dnl Append $ISNANL_LIBM to COSL_LIBM, avoiding gratuitous duplicates.
73 case " $COSL_LIBM " in
74 *" $ISNANL_LIBM "*) ;;
75 *) COSL_LIBM="$COSL_LIBM $ISNANL_LIBM" ;;
77 dnl Append $FLOOR_LIBM to COSL_LIBM, avoiding gratuitous duplicates.
78 case " $COSL_LIBM " in
80 *) COSL_LIBM="$COSL_LIBM $FLOOR_LIBM" ;;
82 dnl Append $FLOORL_LIBM to COSL_LIBM, avoiding gratuitous duplicates.
83 case " $COSL_LIBM " in
84 *" $FLOORL_LIBM "*) ;;
85 *) COSL_LIBM="$COSL_LIBM $FLOORL_LIBM" ;;