2 dnl Copyright (C) 2010-2011 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 # gl_MATHFUNC(FUNC, RETTYPE, PARAMTYPES)
8 # --------------------------------------------------
9 # tests whether the function FUNC is available in libc or libm.
10 # RETTYPE is the return type. PARAMTYPES is a parameter list, with parentheses.
11 # It sets FUNC_LIBM to empty or "-lm" accordingly.
13 AC_DEFUN([gl_MATHFUNC],
15 dnl We need the RETTYPE and PARAMTYPES in order to force linking with the
16 dnl function. With gcc >= 4.3 on glibc/x86_64, calls to the 'fabs' function
17 dnl are inlined by the compiler, therefore linking of these calls does not
18 dnl require -lm, but taking the function pointer of 'fabs' does.
19 m4_pushdef([func], [$1])
20 m4_pushdef([FUNC], [m4_translit([$1],[abcdefghijklmnopqrstuvwxyz],
21 [ABCDEFGHIJKLMNOPQRSTUVWXYZ])])
22 m4_pushdef([ARGS], [m4_bpatsubst(
32 [float \*], [&f_ret])],
33 [double \*], [&d_ret])],
34 [long double \*], [&l_ret])],
36 [float], [1.618034f])],
37 [long double], [1.618033988749894848L])],
38 [double], [1.6180339887])])
40 AC_CACHE_CHECK([whether func() can be used without linking with libm],
41 [gl_cv_func_]func[_no_libm],
45 [[#ifndef __NO_MATH_INLINES
46 # define __NO_MATH_INLINES 1 /* for glibc */
49 $2 (*funcptr) $3 = ]func[;
54 [[$2 y = funcptr ]ARGS[;
55 return y < 0.3 || y > 1.7;
57 [gl_cv_func_]func[_no_libm=yes],
58 [gl_cv_func_]func[_no_libm=no])
60 if test $gl_cv_func_[]func[]_no_libm = no; then
61 AC_CACHE_CHECK([whether func() can be used with libm],
62 [gl_cv_func_]func[_in_libm],
68 [[#ifndef __NO_MATH_INLINES
69 # define __NO_MATH_INLINES 1 /* for glibc */
72 $2 (*funcptr) $3 = ]func[;
77 [[$2 y = funcptr ]ARGS[;
78 return y < 0.3 || y > 1.7;
80 [gl_cv_func_]func[_in_libm=yes],
81 [gl_cv_func_]func[_in_libm=no])
84 if test $gl_cv_func_[]func[]_in_libm = yes; then
94 # gl_COMMON_DOUBLE_MATHFUNC(FUNC)
95 # -------------------------------
96 # tests whether the function FUNC is available in libc or libm.
97 # It sets FUNC_LIBM to empty or "-lm" accordingly.
98 # FUNC must be one of the following functions, that are present on all systems
99 # and provided by libm on all systems except MacOS X, BeOS, Haiku:
100 # acos asin atan atan2 cbrt cos cosh erf erfc exp fmod hypot j0 j1 jn lgamma
101 # log log10 log1p pow remainder sin sinh sqrt tan tanh y0 y1 yn
103 AC_DEFUN([gl_COMMON_DOUBLE_MATHFUNC],
105 AC_REQUIRE([gl_COMMON_DOUBLE_MATHFUNC_TEST])
106 m4_pushdef([FUNC], [m4_translit([$1],[abcdefghijklmnopqrstuvwxyz],
107 [ABCDEFGHIJKLMNOPQRSTUVWXYZ])])
108 FUNC[]_LIBM="$POW_LIBM"
109 AC_SUBST(FUNC[_LIBM])
113 AC_DEFUN([gl_COMMON_DOUBLE_MATHFUNC_TEST],
115 dnl We could use any of the following:
116 dnl gl_MATHFUNC([acos], [double], [(double)])
117 dnl gl_MATHFUNC([asin], [double], [(double)])
118 dnl gl_MATHFUNC([atan], [double], [(double)])
119 dnl gl_MATHFUNC([atan2], [double], [(double, double)])
120 dnl gl_MATHFUNC([cbrt], [double], [(double)])
121 dnl gl_MATHFUNC([cos], [double], [(double)])
122 dnl gl_MATHFUNC([cosh], [double], [(double)])
123 dnl gl_MATHFUNC([erf], [double], [(double)])
124 dnl gl_MATHFUNC([erfc], [double], [(double)])
125 dnl gl_MATHFUNC([exp], [double], [(double)])
126 dnl gl_MATHFUNC([fmod], [double], [(double, double)])
127 dnl gl_MATHFUNC([hypot], [double], [(double, double)])
128 dnl gl_MATHFUNC([j0], [double], [(double)])
129 dnl gl_MATHFUNC([j1], [double], [(double)])
130 dnl gl_MATHFUNC([jn], [double], [(int, double)])
131 dnl gl_MATHFUNC([lgamma], [double], [(double)])
132 dnl gl_MATHFUNC([log], [double], [(double)])
133 dnl gl_MATHFUNC([log10], [double], [(double)])
134 dnl gl_MATHFUNC([log1p], [double], [(double)])
135 dnl gl_MATHFUNC([pow], [double], [(double, double)])
136 dnl gl_MATHFUNC([remainder], [double], [(double, double)])
137 dnl gl_MATHFUNC([sin], [double], [(double)])
138 dnl gl_MATHFUNC([sinh], [double], [(double)])
139 dnl gl_MATHFUNC([sqrt], [double], [(double)])
140 dnl gl_MATHFUNC([tan], [double], [(double)])
141 dnl gl_MATHFUNC([tanh], [double], [(double)])
142 dnl gl_MATHFUNC([y0], [double], [(double)])
143 dnl gl_MATHFUNC([y1], [double], [(double)])
144 dnl gl_MATHFUNC([yn], [double], [(int, double)])
145 gl_MATHFUNC([pow], [double], [(double, double)])