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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # float_h.m4 serial 12
40057
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2 dnl Copyright (C) 2007, 2009-2019 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_FLOAT_H],
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8 [
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9 AC_REQUIRE([AC_PROG_CC])
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10 AC_REQUIRE([AC_CANONICAL_HOST])
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11 FLOAT_H=
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12 REPLACE_FLOAT_LDBL=0
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13 case "$host_os" in
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14 aix* | beos* | openbsd* | mirbsd* | irix*)
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15 FLOAT_H=float.h
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16 ;;
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17 freebsd* | dragonfly*)
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18 case "$host_cpu" in
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19 changequote(,)dnl
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20 i[34567]86 )
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21 changequote([,])dnl
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22 FLOAT_H=float.h
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23 ;;
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24 x86_64 )
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25 # On x86_64 systems, the C compiler may still be generating
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26 # 32-bit code.
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27 AC_COMPILE_IFELSE(
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28 [AC_LANG_SOURCE(
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29 [[#if defined __LP64__ || defined __x86_64__ || defined __amd64__
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30 int ok;
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31 #else
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32 error fail
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33 #endif
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34 ]])],
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35 [],
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36 [FLOAT_H=float.h])
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37 ;;
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38 esac
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39 ;;
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40 linux*)
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41 case "$host_cpu" in
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42 powerpc*)
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43 FLOAT_H=float.h
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44 ;;
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45 esac
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46 ;;
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47 esac
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48 case "$host_os" in
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49 aix* | freebsd* | dragonfly* | linux*)
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50 if test -n "$FLOAT_H"; then
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51 REPLACE_FLOAT_LDBL=1
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52 fi
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53 ;;
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54 esac
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55
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56 dnl Test against glibc-2.7 Linux/SPARC64 bug.
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57 REPLACE_ITOLD=0
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58 AC_CACHE_CHECK([whether conversion from 'int' to 'long double' works],
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59 [gl_cv_func_itold_works],
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60 [
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61 AC_RUN_IFELSE(
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62 [AC_LANG_SOURCE([[
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63 int i = -1;
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64 volatile long double ld;
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65 int main ()
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66 {
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67 ld += i * 1.0L;
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68 if (ld > 0)
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69 return 1;
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70 return 0;
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71 }]])],
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72 [gl_cv_func_itold_works=yes],
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73 [gl_cv_func_itold_works=no],
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74 [case "$host" in
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75 sparc*-*-linux*)
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76 AC_COMPILE_IFELSE(
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77 [AC_LANG_SOURCE(
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78 [[#if defined __LP64__ || defined __arch64__
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79 int ok;
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80 #else
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81 error fail
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82 #endif
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83 ]])],
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84 [gl_cv_func_itold_works="guessing no"],
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85 [gl_cv_func_itold_works="guessing yes"])
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86 ;;
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87 # Guess yes on native Windows.
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88 mingw*) gl_cv_func_itold_works="guessing yes" ;;
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89 *) gl_cv_func_itold_works="guessing yes" ;;
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90 esac
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91 ])
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92 ])
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93 case "$gl_cv_func_itold_works" in
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94 *no)
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95 REPLACE_ITOLD=1
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96 dnl We add the workaround to <float.h> but also to <math.h>,
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97 dnl to increase the chances that the fix function gets pulled in.
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98 FLOAT_H=float.h
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99 ;;
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100 esac
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101
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102 if test -n "$FLOAT_H"; then
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103 gl_NEXT_HEADERS([float.h])
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104 fi
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105 AC_SUBST([FLOAT_H])
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106 AM_CONDITIONAL([GL_GENERATE_FLOAT_H], [test -n "$FLOAT_H"])
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107 AC_SUBST([REPLACE_ITOLD])
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108 ])