3 dnl Copyright (C) 2010-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 AC_DEFUN([gl_FUNC_ASINL],
10 AC_REQUIRE([gl_MATH_H_DEFAULTS])
11 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
13 dnl Persuade glibc <math.h> to declare asinl().
14 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
17 AC_CACHE_CHECK([whether asinl() can be used without linking with libm],
18 [gl_cv_func_asinl_no_libm],
22 [[#ifndef __NO_MATH_INLINES
23 # define __NO_MATH_INLINES 1 /* for glibc */
26 long double (* volatile funcptr) (long double) = asinl;
28 [[return funcptr (x) > 1
29 || asinl (x) > 1;]])],
30 [gl_cv_func_asinl_no_libm=yes],
31 [gl_cv_func_asinl_no_libm=no])
33 if test $gl_cv_func_asinl_no_libm = no; then
34 AC_CACHE_CHECK([whether asinl() can be used with libm],
35 [gl_cv_func_asinl_in_libm],
41 [[#ifndef __NO_MATH_INLINES
42 # define __NO_MATH_INLINES 1 /* for glibc */
45 long double (* volatile funcptr) (long double) = asinl;
47 [[return funcptr (x) > 1
48 || asinl (x) > 1;]])],
49 [gl_cv_func_asinl_in_libm=yes],
50 [gl_cv_func_asinl_in_libm=no])
53 if test $gl_cv_func_asinl_in_libm = yes; then
57 if test $gl_cv_func_asinl_no_libm = yes \
58 || test $gl_cv_func_asinl_in_libm = yes; then
59 dnl Also check whether it's declared.
60 dnl Mac OS X 10.3 has asinl() in libc but doesn't declare it in <math.h>.
61 AC_CHECK_DECL([asinl], , [HAVE_DECL_ASINL=0], [[#include <math.h>]])
65 dnl Find libraries needed to link lib/asinl.c.
66 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
67 AC_REQUIRE([gl_FUNC_ASIN])
68 ASINL_LIBM="$ASIN_LIBM"
70 AC_REQUIRE([gl_FUNC_SQRTL])
71 dnl Append $SQRTL_LIBM to ASINL_LIBM, avoiding gratuitous duplicates.
72 case " $ASINL_LIBM " in
74 *) ASINL_LIBM="$ASINL_LIBM $SQRTL_LIBM" ;;
78 AC_SUBST([ASINL_LIBM])