kc3-lang/gnulib/m4/isnand.m4

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• m4/isnand.m4

• # isnand.m4 serial 12
  dnl Copyright (C) 2007-2023 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.
  
  dnl Check how to get or define isnand().
  
  AC_DEFUN([gl_FUNC_ISNAND],
  [
    AC_REQUIRE([gl_MATH_H_DEFAULTS])
    ISNAND_LIBM=
    gl_HAVE_ISNAND_NO_LIBM
    if test $gl_cv_func_isnand_no_libm = no; then
      gl_HAVE_ISNAND_IN_LIBM
      if test $gl_cv_func_isnand_in_libm = yes; then
        ISNAND_LIBM=-lm
      fi
    fi
    dnl The variable gl_func_isnand set here is used by isnan.m4.
    if test $gl_cv_func_isnand_no_libm = yes \
       || test $gl_cv_func_isnand_in_libm = yes; then
      gl_func_isnand=yes
    else
      gl_func_isnand=no
      HAVE_ISNAND=0
    fi
    AC_SUBST([ISNAND_LIBM])
  ])
  
  dnl Check how to get or define isnand() without linking with libm.
  
  AC_DEFUN([gl_FUNC_ISNAND_NO_LIBM],
  [
    gl_HAVE_ISNAND_NO_LIBM
    gl_func_isnand_no_libm=$gl_cv_func_isnand_no_libm
    if test $gl_cv_func_isnand_no_libm = yes; then
      AC_DEFINE([HAVE_ISNAND_IN_LIBC], [1],
        [Define if the isnan(double) function is available in libc.])
    fi
  ])
  
  dnl Prerequisites of replacement isnand definition. It does not need -lm.
  AC_DEFUN([gl_PREREQ_ISNAND],
  [
    AC_REQUIRE([gl_DOUBLE_EXPONENT_LOCATION])
  ])
  
  dnl Test whether isnand() can be used with libm.
  
  AC_DEFUN([gl_HAVE_ISNAND_IN_LIBM],
  [
    AC_CACHE_CHECK([whether isnan(double) can be used with libm],
      [gl_cv_func_isnand_in_libm],
      [
        save_LIBS="$LIBS"
        LIBS="$LIBS -lm"
        AC_LINK_IFELSE(
          [AC_LANG_PROGRAM(
             [[#include <math.h>
               #if (__GNUC__ >= 4) || (__clang_major__ >= 4)
               # undef isnand
               # define isnand(x) __builtin_isnan ((double)(x))
               #elif defined isnan
               # undef isnand
               # define isnand(x) isnan ((double)(x))
               #endif
               double x;]],
             [[return isnand (x);]])],
          [gl_cv_func_isnand_in_libm=yes],
          [gl_cv_func_isnand_in_libm=no])
        LIBS="$save_LIBS"
      ])
  ])
  
  AC_DEFUN([gl_HAVE_ISNAND_NO_LIBM],
  [
    AC_CACHE_CHECK([whether isnan(double) can be used without linking with libm],
      [gl_cv_func_isnand_no_libm],
      [
        AC_LINK_IFELSE(
          [AC_LANG_PROGRAM(
             [[#include <math.h>
               #if (__GNUC__ >= 4) || (__clang_major__ >= 4)
               # undef isnand
               # define isnand(x) __builtin_isnan ((double)(x))
               #else
               # undef isnand
               # define isnand(x) isnan ((double)(x))
               #endif
               double x;]],
             [[return isnand (x);]])],
          [gl_cv_func_isnand_no_libm=yes],
          [gl_cv_func_isnand_no_libm=no])
      ])
  ])
  

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