kc3-lang/gnulib/m4/ilogbl.m4

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• Hash : 9fc81090
  Author :
  Date : 2013-01-01T00:50:58
  

  maint: update all copyright year number ranges
  
  Run "make update-copyright".  Compare to commit 1602f0a from last year.
  
  Signed-off-by: Eric Blake <eblake@redhat.com>
  

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• m4/ilogbl.m4

• # ilogbl.m4 serial 1
  dnl Copyright (C) 2010-2013 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_ILOGBL],
  [
    AC_REQUIRE([gl_MATH_H_DEFAULTS])
    AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
    AC_REQUIRE([gl_FUNC_ILOGB])
  
    dnl Persuade glibc <math.h> to declare ilogbl().
    AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  
    dnl Test whether ilogbl() exists. Assume that ilogbl(), if it exists, is
    dnl defined in the same library as ilogb().
    save_LIBS="$LIBS"
    LIBS="$LIBS $ILOGB_LIBM"
    AC_CACHE_CHECK([for ilogbl],
      [gl_cv_func_ilogbl],
      [
        AC_LINK_IFELSE(
          [AC_LANG_PROGRAM(
             [[#ifndef __NO_MATH_INLINES
               # define __NO_MATH_INLINES 1 /* for glibc */
               #endif
               #include <math.h>
               int (*funcptr) (long double) = ilogbl;
               long double x;]],
             [[return (funcptr (x) % 2) == 0
                      || (ilogbl (x) % 2) == 0;]])],
          [gl_cv_func_ilogbl=yes],
          [gl_cv_func_ilogbl=no])
      ])
    LIBS="$save_LIBS"
    if test $gl_cv_func_ilogbl = yes; then
      ILOGBL_LIBM="$ILOGB_LIBM"
    else
      HAVE_ILOGBL=0
      dnl Find libraries needed to link lib/ilogbl.c.
      if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
        ILOGBL_LIBM="$ILOGB_LIBM"
      else
        AC_REQUIRE([gl_FUNC_FREXPL])
        AC_REQUIRE([gl_FUNC_ISNANL])
        ILOGBL_LIBM=
        dnl Append $FREXPL_LIBM to ILOGBL_LIBM, avoiding gratuitous duplicates.
        case " $ILOGBL_LIBM " in
          *" $FREXPL_LIBM "*) ;;
          *) ILOGBL_LIBM="$ILOGBL_LIBM $FREXPL_LIBM" ;;
        esac
        dnl Append $ISNANL_LIBM to ILOGBL_LIBM, avoiding gratuitous duplicates.
        case " $ILOGBL_LIBM " in
          *" $ISNANL_LIBM "*) ;;
          *) ILOGBL_LIBM="$ILOGBL_LIBM $ISNANL_LIBM" ;;
        esac
      fi
    fi
    AC_SUBST([ILOGBL_LIBM])
  ])
  

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