kc3-lang/gnulib/m4/remainder.m4

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• Hash : 281b825e
  Author :
  Date : 2018-01-01T00:57:25
  

  maint: Run 'make update-copyright'
  

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• m4/remainder.m4

• # remainder.m4 serial 6
  dnl Copyright (C) 2012-2018 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
  
  AC_DEFUN([gl_FUNC_REMAINDER],
  [
    m4_divert_text([DEFAULTS], [gl_remainder_required=plain])
    AC_REQUIRE([gl_MATH_H_DEFAULTS])
  
    dnl Test whether remainder() is declared. On IRIX 5.3 it is not declared.
    AC_CHECK_DECL([remainder], , [HAVE_DECL_REMAINDER=0], [[#include <math.h>]])
  
    REMAINDER_LIBM=
    AC_CACHE_CHECK([whether remainder() can be used without linking with libm],
      [gl_cv_func_remainder_no_libm],
      [
        AC_LINK_IFELSE(
          [AC_LANG_PROGRAM(
             [[#ifndef __NO_MATH_INLINES
               # define __NO_MATH_INLINES 1 /* for glibc */
               #endif
               #include <math.h>
               double x;
               double y;]],
             [[return remainder (x, y) > 1;]])],
          [gl_cv_func_remainder_no_libm=yes],
          [gl_cv_func_remainder_no_libm=no])
      ])
    if test $gl_cv_func_remainder_no_libm = no; then
      AC_CACHE_CHECK([whether remainder() can be used with libm],
        [gl_cv_func_remainder_in_libm],
        [
          save_LIBS="$LIBS"
          LIBS="$LIBS -lm"
          AC_LINK_IFELSE(
            [AC_LANG_PROGRAM(
               [[#ifndef __NO_MATH_INLINES
                 # define __NO_MATH_INLINES 1 /* for glibc */
                 #endif
                 #include <math.h>
                 double x;
                 double y;]],
               [[return remainder (x, y) > 1;]])],
            [gl_cv_func_remainder_in_libm=yes],
            [gl_cv_func_remainder_in_libm=no])
          LIBS="$save_LIBS"
        ])
      if test $gl_cv_func_remainder_in_libm = yes; then
        REMAINDER_LIBM=-lm
      fi
    fi
    if test $gl_cv_func_remainder_no_libm = yes \
       || test $gl_cv_func_remainder_in_libm = yes; then
      :
      m4_ifdef([gl_FUNC_REMAINDER_IEEE], [
        if test $gl_remainder_required = ieee && test $REPLACE_REMAINDER = 0; then
          AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
          AC_CACHE_CHECK([whether remainder works according to ISO C 99 with IEC 60559],
            [gl_cv_func_remainder_ieee],
            [
              save_LIBS="$LIBS"
              LIBS="$LIBS $REMAINDER_LIBM"
              AC_RUN_IFELSE(
                [AC_LANG_SOURCE([[
  #ifndef __NO_MATH_INLINES
  # define __NO_MATH_INLINES 1 /* for glibc */
  #endif
  #include <math.h>
  /* Compare two numbers with ==.
     This is a separate function because IRIX 6.5 "cc -O" miscompiles an
     'x == x' test.  */
  static int
  numeric_equal (double x, double y)
  {
    return x == y;
  }
  static double dummy (double x, double y) { return 0; }
  int main (int argc, char *argv[])
  {
    double (*my_remainder) (double, double) = argc ? remainder : dummy;
    double f;
    /* Test remainder(...,0.0).
       This test fails on OSF/1 5.1.  */
    f = my_remainder (2.0, 0.0);
    if (numeric_equal (f, f))
      return 1;
    return 0;
  }
                ]])],
                [gl_cv_func_remainder_ieee=yes],
                [gl_cv_func_remainder_ieee=no],
                [case "$host_os" in
                                  # Guess yes on glibc systems.
                   *-gnu* | gnu*) gl_cv_func_remainder_ieee="guessing yes" ;;
                                  # Guess yes on native Windows.
                   mingw*)        gl_cv_func_remainder_ieee="guessing yes" ;;
                                  # If we don't know, assume the worst.
                   *)             gl_cv_func_remainder_ieee="guessing no" ;;
                 esac
                ])
              LIBS="$save_LIBS"
            ])
          case "$gl_cv_func_remainder_ieee" in
            *yes) ;;
            *) REPLACE_REMAINDER=1 ;;
          esac
        fi
      ])
    else
      HAVE_REMAINDER=0
    fi
    if test $HAVE_REMAINDER = 0 || test $REPLACE_REMAINDER = 1; then
      dnl Find libraries needed to link lib/remainder.c.
      AC_REQUIRE([gl_FUNC_FABS])
      AC_REQUIRE([gl_FUNC_FMOD])
      AC_REQUIRE([gl_FUNC_ISNAND])
      REMAINDER_LIBM=
      dnl Append $FABS_LIBM to REMAINDER_LIBM, avoiding gratuitous duplicates.
      case " $REMAINDER_LIBM " in
        *" $FABS_LIBM "*) ;;
        *) REMAINDER_LIBM="$REMAINDER_LIBM $FABS_LIBM" ;;
      esac
      dnl Append $FMOD_LIBM to REMAINDER_LIBM, avoiding gratuitous duplicates.
      case " $REMAINDER_LIBM " in
        *" $FMOD_LIBM "*) ;;
        *) REMAINDER_LIBM="$REMAINDER_LIBM $FMOD_LIBM" ;;
      esac
      dnl Append $ISNAND_LIBM to REMAINDER_LIBM, avoiding gratuitous duplicates.
      case " $REMAINDER_LIBM " in
        *" $ISNAND_LIBM "*) ;;
        *) REMAINDER_LIBM="$REMAINDER_LIBM $ISNAND_LIBM" ;;
      esac
    fi
    AC_SUBST([REMAINDER_LIBM])
  ])
  

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