2 dnl Copyright (C) 2010-2012 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_EXPM1L],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
12 dnl Persuade glibc <math.h> to declare expm1l().
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
16 AC_CACHE_CHECK([whether expm1l() can be used without linking with libm],
17 [gl_cv_func_expm1l_no_libm],
21 [[#ifndef __NO_MATH_INLINES
22 # define __NO_MATH_INLINES 1 /* for glibc */
25 long double (*funcptr) (long double) = expm1l;
27 [[return funcptr (x) > 0.5
28 || expm1l (x) > 0.5;]])],
29 [gl_cv_func_expm1l_no_libm=yes],
30 [gl_cv_func_expm1l_no_libm=no])
32 if test $gl_cv_func_expm1l_no_libm = no; then
33 AC_CACHE_CHECK([whether expm1l() can be used with libm],
34 [gl_cv_func_expm1l_in_libm],
40 [[#ifndef __NO_MATH_INLINES
41 # define __NO_MATH_INLINES 1 /* for glibc */
44 long double (*funcptr) (long double) = expm1l;
46 [[return funcptr (x) > 0.5
47 || expm1l (x) > 0.5;]])],
48 [gl_cv_func_expm1l_in_libm=yes],
49 [gl_cv_func_expm1l_in_libm=no])
52 if test $gl_cv_func_expm1l_in_libm = yes; then
56 if test $gl_cv_func_expm1l_no_libm = no \
57 && test $gl_cv_func_expm1l_in_libm = no; then
59 dnl Find libraries needed to link lib/expm1l.c.
60 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
61 AC_REQUIRE([gl_FUNC_EXPM1])
62 EXPM1L_LIBM="$EXPM1_LIBM"
64 AC_REQUIRE([gl_FUNC_ISNANL])
65 AC_REQUIRE([gl_FUNC_EXPL])
66 AC_REQUIRE([gl_FUNC_ROUNDL])
67 AC_REQUIRE([gl_FUNC_LDEXPL])
69 dnl Append $ISNANL_LIBM to EXPM1L_LIBM, avoiding gratuitous duplicates.
70 case " $EXPM1L_LIBM " in
71 *" $ISNANL_LIBM "*) ;;
72 *) EXPM1L_LIBM="$EXPM1L_LIBM $ISNANL_LIBM" ;;
74 dnl Append $EXPL_LIBM to EXPM1L_LIBM, avoiding gratuitous duplicates.
75 case " $EXPM1L_LIBM " in
77 *) EXPM1L_LIBM="$EXPM1L_LIBM $EXPL_LIBM" ;;
79 dnl Append $ROUNDL_LIBM to EXPM1L_LIBM, avoiding gratuitous duplicates.
80 case " $EXPM1L_LIBM " in
81 *" $ROUNDL_LIBM "*) ;;
82 *) EXPM1L_LIBM="$EXPM1L_LIBM $ROUNDL_LIBM" ;;
84 dnl Append $LDEXPL_LIBM to EXPM1L_LIBM, avoiding gratuitous duplicates.
85 case " $EXPM1L_LIBM " in
86 *" $LDEXPL_LIBM "*) ;;
87 *) EXPM1L_LIBM="$EXPM1L_LIBM $LDEXPL_LIBM" ;;
91 AC_SUBST([EXPM1L_LIBM])