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unistd: port readlink to Mac OS X 10.3.9 * lib/unistd.in.h (_GL_INCLUDING_UNISTD_H): New macro, to work around self-include problem in Mac OS X 10.3.9 when combined with readlink module. Problem reported by Klaus Zietler in <http://bugs.gnu.org/16825>.
author Paul Eggert <eggert@penguin.cs.ucla.edu>
date Tue, 25 Feb 2014 11:16:27 -0800
parents 344018b6e5d7
children
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1 # modfl.m4 serial 3
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2 dnl Copyright (C) 2011-2014 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_MODFL],
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8 [
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9 m4_divert_text([DEFAULTS], [gl_modfl_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
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13 dnl Persuade glibc <math.h> to declare modfl().
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14 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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15
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16 dnl Test whether modfl() exists. We cannot assume that modfl(), if it
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17 dnl exists, is defined in the same library as modf(). This is not the case
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18 dnl on FreeBSD, Solaris.
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19 gl_MATHFUNC([modfl], [long double], [(long double, long double *)])
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20 if test $gl_cv_func_modfl_no_libm = yes \
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21 || test $gl_cv_func_modfl_in_libm = yes; then
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22 :
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23 m4_ifdef([gl_FUNC_MODFL_IEEE], [
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24 if test $gl_modfl_required = ieee && test $REPLACE_MODFL = 0; then
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25 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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26 AC_CACHE_CHECK([whether modfl works according to ISO C 99 with IEC 60559],
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27 [gl_cv_func_modfl_ieee],
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28 [
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29 save_LIBS="$LIBS"
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30 LIBS="$LIBS $MODFL_LIBM"
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31 AC_RUN_IFELSE(
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32 [AC_LANG_SOURCE([[
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33 #ifndef __NO_MATH_INLINES
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34 # define __NO_MATH_INLINES 1 /* for glibc */
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35 #endif
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36 #include <math.h>
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37 ]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
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38 ]gl_LONG_DOUBLE_SIGNBIT_CODE[
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39 /* Compare two numbers with ==.
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40 This is a separate function because IRIX 6.5 "cc -O" miscompiles an
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41 'x == x' test. */
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42 static int
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43 numeric_equal (long double x, long double y)
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44 {
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45 return x == y;
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46 }
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47 static long double dummy (long double x, long double *iptr) { return 0; }
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48 long double zero;
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49 long double minus_one = - 1.0L;
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50 int main (int argc, char *argv[])
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51 {
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52 long double (*my_modfl) (long double, long double *) = argc ? modfl : dummy;
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53 long double i;
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54 long double f;
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55 /* Test modfl(-Inf,...).
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56 This test fails on IRIX 6.5, OSF/1 5.1, mingw. */
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57 f = my_modfl (minus_one / zero, &i);
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58 if (!(f == 0.0L) || (signbitl (minus_zerol) && !signbitl (f)))
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59 return 1;
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60 return 0;
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61 }
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62 ]])],
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63 [gl_cv_func_modfl_ieee=yes],
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64 [gl_cv_func_modfl_ieee=no],
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65 [case "$host_os" in
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66 # Guess yes on glibc systems.
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67 *-gnu*) gl_cv_func_modfl_ieee="guessing yes" ;;
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68 # If we don't know, assume the worst.
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69 *) gl_cv_func_modfl_ieee="guessing no" ;;
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70 esac
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71 ])
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72 LIBS="$save_LIBS"
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73 ])
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74 case "$gl_cv_func_modfl_ieee" in
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75 *yes) ;;
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76 *) REPLACE_MODFL=1 ;;
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77 esac
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78 fi
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79 ])
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80 else
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81 HAVE_MODFL=0
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82 fi
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83 if test $HAVE_MODFL = 0 || test $REPLACE_MODFL = 1; then
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84 dnl Find libraries needed to link lib/modfl.c.
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85 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
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86 AC_REQUIRE([gl_FUNC_MODF])
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87 MODFL_LIBM="$MODF_LIBM"
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88 else
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89 AC_REQUIRE([gl_FUNC_TRUNCL])
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90 MODFL_LIBM="$TRUNCL_LIBM"
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91 fi
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92 fi
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93 AC_SUBST([MODFL_LIBM])
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94 ])