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annotate m4/mathfunc.m4 @ 15009:2917eb19f982

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truncl: Move AC_LIBOBJ invocations to module description. * m4/truncl.m4 (gl_FUNC_TRUNCL): Move AC_LIBOBJ invocation from here... * modules/truncl (configure.ac): ... to here.
author Bruno Haible <bruno@clisp.org>
date Sat, 21 May 2011 11:32:55 +0200
parents 97fc9a21a8fb
children bc22a56bfa43
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # mathfunc.m4 serial 6
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2 dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 # gl_MATHFUNC(FUNC, RETTYPE, PARAMTYPES)
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8 # --------------------------------------------------
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9 # tests whether the function FUNC is available in libc or libm.
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10 # RETTYPE is the return type. PARAMTYPES is a parameter list, with parentheses.
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11 # It sets FUNC_LIBM to empty or "-lm" accordingly.
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12
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13 AC_DEFUN([gl_MATHFUNC],
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14 [
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15 dnl We need the RETTYPE and PARAMTYPES in order to force linking with the
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16 dnl function. With gcc >= 4.3 on glibc/x86_64, calls to the 'fabs' function
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17 dnl are inlined by the compiler, therefore linking of these calls does not
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18 dnl require -lm, but taking the function pointer of 'fabs' does.
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19 m4_pushdef([func], [$1])
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20 m4_pushdef([FUNC], [m4_translit([$1],[abcdefghijklmnopqrstuvwxyz],
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21 [ABCDEFGHIJKLMNOPQRSTUVWXYZ])])
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22 FUNC[]_LIBM=
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23 AC_CACHE_CHECK([whether func() can be used without linking with libm],
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24 [gl_cv_func_]func[_no_libm],
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25 [
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26 AC_LINK_IFELSE(
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27 [AC_LANG_PROGRAM(
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28 [[#ifndef __NO_MATH_INLINES
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29 # define __NO_MATH_INLINES 1 /* for glibc */
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30 #endif
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31 #include <math.h>
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32 $2 (*funcptr) $3 = ]func[;
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33 double d_ret;]],
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34 [[$2 y = funcptr ]m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([$3], [int], [2])], [double \*], [&d_ret])], [double], [1.6180339887])[;
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35 return y < 0.3 || y > 1.7;
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36 ]])],
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37 [gl_cv_func_]func[_no_libm=yes],
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38 [gl_cv_func_]func[_no_libm=no])
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39 ])
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40 if test $gl_cv_func_[]func[]_no_libm = no; then
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41 AC_CACHE_CHECK([whether func() can be used with libm],
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42 [gl_cv_func_]func[_in_libm],
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43 [
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44 save_LIBS="$LIBS"
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45 LIBS="$LIBS -lm"
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46 AC_LINK_IFELSE(
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47 [AC_LANG_PROGRAM(
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48 [[#ifndef __NO_MATH_INLINES
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49 # define __NO_MATH_INLINES 1 /* for glibc */
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50 #endif
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51 #include <math.h>
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52 $2 (*funcptr) $3 = ]func[;
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53 double d_ret;]],
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54 [[$2 y = funcptr ]m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([$3], [int], [2])], [double \*], [&d_ret])], [double], [1.6180339887])[;
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55 return y < 0.3 || y > 1.7;
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56 ]])],
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57 [gl_cv_func_]func[_in_libm=yes],
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58 [gl_cv_func_]func[_in_libm=no])
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59 LIBS="$save_LIBS"
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60 ])
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61 if test $gl_cv_func_[]func[]_in_libm = yes; then
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62 FUNC[]_LIBM=-lm
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63 fi
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64 fi
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65 AC_SUBST(FUNC[_LIBM])
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66 m4_popdef([FUNC])
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67 m4_popdef([func])
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68 ])
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69
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70 # gl_COMMON_DOUBLE_MATHFUNC(FUNC)
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71 # -------------------------------
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72 # tests whether the function FUNC is available in libc or libm.
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73 # It sets FUNC_LIBM to empty or "-lm" accordingly.
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74 # FUNC must be one of the following functions, that are present on all systems
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75 # and provided by libm on all systems except MacOS X, BeOS, Haiku:
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76 # acos asin atan atan2 cbrt cos cosh erf erfc exp fmod hypot j0 j1 jn lgamma
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77 # log log10 log1p pow remainder sin sinh sqrt tan tanh y0 y1 yn
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78
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79 AC_DEFUN([gl_COMMON_DOUBLE_MATHFUNC],
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80 [
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81 AC_REQUIRE([gl_COMMON_DOUBLE_MATHFUNC_TEST])
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82 m4_pushdef([FUNC], [m4_translit([$1],[abcdefghijklmnopqrstuvwxyz],
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83 [ABCDEFGHIJKLMNOPQRSTUVWXYZ])])
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84 FUNC[]_LIBM="$POW_LIBM"
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85 AC_SUBST(FUNC[_LIBM])
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86 m4_popdef([FUNC])
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87 ])
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88
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89 AC_DEFUN([gl_COMMON_DOUBLE_MATHFUNC_TEST],
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90 [
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91 dnl We could use any of the following:
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92 dnl gl_MATHFUNC([acos], [double], [(double)])
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93 dnl gl_MATHFUNC([asin], [double], [(double)])
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94 dnl gl_MATHFUNC([atan], [double], [(double)])
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95 dnl gl_MATHFUNC([atan2], [double], [(double, double)])
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96 dnl gl_MATHFUNC([cbrt], [double], [(double)])
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97 dnl gl_MATHFUNC([cos], [double], [(double)])
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98 dnl gl_MATHFUNC([cosh], [double], [(double)])
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99 dnl gl_MATHFUNC([erf], [double], [(double)])
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100 dnl gl_MATHFUNC([erfc], [double], [(double)])
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101 dnl gl_MATHFUNC([exp], [double], [(double)])
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102 dnl gl_MATHFUNC([fmod], [double], [(double, double)])
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103 dnl gl_MATHFUNC([hypot], [double], [(double, double)])
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104 dnl gl_MATHFUNC([j0], [double], [(double)])
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105 dnl gl_MATHFUNC([j1], [double], [(double)])
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106 dnl gl_MATHFUNC([jn], [double], [(int, double)])
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107 dnl gl_MATHFUNC([lgamma], [double], [(double)])
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108 dnl gl_MATHFUNC([log], [double], [(double)])
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109 dnl gl_MATHFUNC([log10], [double], [(double)])
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110 dnl gl_MATHFUNC([log1p], [double], [(double)])
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111 dnl gl_MATHFUNC([pow], [double], [(double, double)])
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112 dnl gl_MATHFUNC([remainder], [double], [(double, double)])
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113 dnl gl_MATHFUNC([sin], [double], [(double)])
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114 dnl gl_MATHFUNC([sinh], [double], [(double)])
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115 dnl gl_MATHFUNC([sqrt], [double], [(double)])
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116 dnl gl_MATHFUNC([tan], [double], [(double)])
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117 dnl gl_MATHFUNC([tanh], [double], [(double)])
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118 dnl gl_MATHFUNC([y0], [double], [(double)])
6ff1b1c23f57 Perform the same test for many <math.h> functions.
Bruno Haible <bruno@clisp.org>
parents: 12777
diff changeset
119 dnl gl_MATHFUNC([y1], [double], [(double)])
6ff1b1c23f57 Perform the same test for many <math.h> functions.
Bruno Haible <bruno@clisp.org>
parents: 12777
diff changeset
120 dnl gl_MATHFUNC([yn], [double], [(int, double)])
6ff1b1c23f57 Perform the same test for many <math.h> functions.
Bruno Haible <bruno@clisp.org>
parents: 12777
diff changeset
121 gl_MATHFUNC([pow], [double], [(double, double)])
6ff1b1c23f57 Perform the same test for many <math.h> functions.
Bruno Haible <bruno@clisp.org>
parents: 12777
diff changeset
122 ])