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annotate m4/exp2l.m4 @ 17536:ea01543bbca7

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install-reloc: Support multi-binary installation. * build-aux/install-reloc: Support installing multiple programs in one invocation, as done by Automake starting with commit 4295fe33eb23f (Multi-file install for PROGRAMS.). From Bruno Haible <bruno@clisp.org>, archived at http://lists.debian.org/debian-bsd/2012/05/msg00032.html. Reported by Sylvain <beuc@gnu.org>.
author Bruno Haible <bruno@clisp.org>
date Mon, 21 Oct 2013 22:48:35 -0700
parents e542fd46ad6f
children 344018b6e5d7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # exp2l.m4 serial 3
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2 dnl Copyright (C) 2010-2013 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 AC_DEFUN([gl_FUNC_EXP2L],
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8 [
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9 m4_divert_text([DEFAULTS], [gl_exp2l_required=plain])
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10 AC_REQUIRE([gl_MATH_H_DEFAULTS])
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11 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
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12 AC_REQUIRE([gl_FUNC_EXP2])
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13
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14 dnl Persuade glibc <math.h> to declare exp2l().
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15 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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16
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17 dnl Test whether exp2l() exists. Assume that exp2l(), if it exists, is
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18 dnl defined in the same library as exp2().
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19 save_LIBS="$LIBS"
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20 LIBS="$LIBS $EXP2_LIBM"
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21 AC_CHECK_FUNCS([exp2l])
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22 LIBS="$save_LIBS"
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23 if test $ac_cv_func_exp2l = yes; then
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24 HAVE_EXP2L=1
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25 EXP2L_LIBM="$EXP2_LIBM"
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26 dnl Also check whether it's declared.
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27 dnl IRIX 6.5 has exp2l() in libm but doesn't declare it in <math.h>.
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28 AC_CHECK_DECL([exp2l], , [HAVE_DECL_EXP2L=0], [[#include <math.h>]])
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29 m4_ifdef([gl_FUNC_EXP2L_IEEE], [
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30 if test $gl_exp2l_required = ieee && test $REPLACE_EXP2L = 0; then
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31 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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32 AC_CACHE_CHECK([whether exp2l works according to ISO C 99 with IEC 60559],
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33 [gl_cv_func_exp2l_ieee],
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34 [
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35 save_LIBS="$LIBS"
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36 LIBS="$LIBS $EXP2L_LIBM"
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37 AC_RUN_IFELSE(
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38 [AC_LANG_SOURCE([[
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39 #ifndef __NO_MATH_INLINES
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40 # define __NO_MATH_INLINES 1 /* for glibc */
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41 #endif
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42 #include <math.h>
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43 #undef exp2l
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44 extern
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45 #ifdef __cplusplus
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46 "C"
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47 #endif
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48 long double exp2l (long double);
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49 static long double dummy (long double x) { return 0; }
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50 static long double zero;
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51 int main (int argc, char *argv[])
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52 {
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53 long double (*my_exp2l) (long double) = argc ? exp2l : dummy;
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54 int result = 0;
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55 /* This test fails on OpenBSD 4.9, where exp2l(NaN) = 0.0. */
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56 if (exp2l (zero / zero) == 0.0L)
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57 result |= 1;
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58 /* This test fails on IRIX 6.5, where exp2l(-Inf) = 1.0. */
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59 if (!(exp2l (-1.0L / zero) == 0.0L))
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60 result |= 2;
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61 return result;
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62 }
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63 ]])],
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64 [gl_cv_func_exp2l_ieee=yes],
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65 [gl_cv_func_exp2l_ieee=no],
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66 [case "$host_os" in
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67 # Guess yes on glibc systems.
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68 *-gnu*) gl_cv_func_exp2l_ieee="guessing yes" ;;
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69 # If we don't know, assume the worst.
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70 *) gl_cv_func_exp2l_ieee="guessing no" ;;
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71 esac
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72 ])
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73 LIBS="$save_LIBS"
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74 ])
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75 case "$gl_cv_func_exp2l_ieee" in
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76 *yes) ;;
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77 *) REPLACE_EXP2L=1 ;;
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78 esac
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79 fi
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80 ])
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81 else
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82 HAVE_EXP2L=0
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83 HAVE_DECL_EXP2L=0
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84 fi
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85 if test $HAVE_EXP2L = 0 || test $REPLACE_EXP2L = 1; then
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86 dnl Find libraries needed to link lib/exp2l.c.
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87 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
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88 EXP2L_LIBM="$EXP2_LIBM"
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89 else
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90 AC_REQUIRE([gl_FUNC_ISNANL])
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91 AC_REQUIRE([gl_FUNC_ROUNDL])
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92 AC_REQUIRE([gl_FUNC_LDEXPL])
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93 EXP2L_LIBM=
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94 dnl Append $ISNANL_LIBM to EXP2L_LIBM, avoiding gratuitous duplicates.
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95 case " $EXP2L_LIBM " in
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96 *" $ISNANL_LIBM "*) ;;
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97 *) EXP2L_LIBM="$EXP2L_LIBM $ISNANL_LIBM" ;;
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98 esac
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99 dnl Append $ROUNDL_LIBM to EXP2L_LIBM, avoiding gratuitous duplicates.
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100 case " $EXP2L_LIBM " in
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101 *" $ROUNDL_LIBM "*) ;;
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102 *) EXP2L_LIBM="$EXP2L_LIBM $ROUNDL_LIBM" ;;
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103 esac
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104 dnl Append $LDEXPL_LIBM to EXP2L_LIBM, avoiding gratuitous duplicates.
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105 case " $EXP2L_LIBM " in
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106 *" $LDEXPL_LIBM "*) ;;
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107 *) EXP2L_LIBM="$EXP2L_LIBM $LDEXPL_LIBM" ;;
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108 esac
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109 fi
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110 fi
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111 AC_SUBST([EXP2L_LIBM])
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112 ])