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b81eb64633
From Gnulib v0.0-4889-ge375fe3. * m4/gnulib-cache.m4: Add `log1p' and `round', requested by Mark H Weaver <mhw@netris.org>. Use `malloc-gnu' instead of `malloc', the latter being obsolete.
88 lines
2.4 KiB
Text
88 lines
2.4 KiB
Text
# ceil.m4 serial 5
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dnl Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_CEIL],
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[
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m4_divert_text([DEFAULTS], [gl_ceil_required=plain])
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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dnl Test whether ceil() can be used without libm.
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gl_FUNC_CEIL_LIBS
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if test "$CEIL_LIBM" = "?"; then
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CEIL_LIBM=
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fi
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m4_ifdef([gl_FUNC_CEIL_IEEE], [
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if test $gl_ceil_required = ieee && test $REPLACE_CEIL = 0; then
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AC_CACHE_CHECK([whether ceil works according to ISO C 99 with IEC 60559],
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[gl_cv_func_ceil_ieee],
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[
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save_LIBS="$LIBS"
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LIBS="$LIBS $CEIL_LIBM"
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AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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]gl_DOUBLE_MINUS_ZERO_CODE[
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]gl_DOUBLE_SIGNBIT_CODE[
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int main()
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{
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/* Test whether ceil (-0.0) is -0.0. */
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if (signbitd (minus_zerod) && !signbitd (ceil (minus_zerod)))
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return 1;
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return 0;
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}
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]])],
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[gl_cv_func_ceil_ieee=yes],
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[gl_cv_func_ceil_ieee=no],
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[gl_cv_func_ceil_ieee="guessing no"])
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LIBS="$save_LIBS"
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])
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case "$gl_cv_func_ceil_ieee" in
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*yes) ;;
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*) REPLACE_CEIL=1 ;;
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esac
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fi
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])
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if test $REPLACE_CEIL = 1; then
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AC_LIBOBJ([ceil])
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CEIL_LIBM=
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fi
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AC_SUBST([CEIL_LIBM])
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])
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# Determines the libraries needed to get the ceil() function.
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# Sets CEIL_LIBM.
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AC_DEFUN([gl_FUNC_CEIL_LIBS],
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[
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gl_CACHE_VAL_SILENT([gl_cv_func_ceil_libm], [
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gl_cv_func_ceil_libm=?
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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double x;]],
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[[x = ceil(x);]])],
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[gl_cv_func_ceil_libm=])
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if test "$gl_cv_func_ceil_libm" = "?"; then
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save_LIBS="$LIBS"
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LIBS="$LIBS -lm"
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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double x;]],
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[[x = ceil(x);]])],
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[gl_cv_func_ceil_libm="-lm"])
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LIBS="$save_LIBS"
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fi
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])
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CEIL_LIBM="$gl_cv_func_ceil_libm"
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])
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