-# ceill.m4 serial 3
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# ceill.m4 serial 12
+dnl Copyright (C) 2007, 2009-2011 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_CEILL],
[
+ m4_divert_text([DEFAULTS], [gl_ceill_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
dnl Persuade glibc <math.h> to declare ceill().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
dnl Test whether ceill() is declared.
- AC_CHECK_DECLS([ceill], , , [#include <math.h>])
+ AC_CHECK_DECLS([ceill], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_ceill" = yes; then
dnl Test whether ceill() can be used without libm.
gl_FUNC_CEILL_LIBS
dnl libm.so, but not in the libm.so that the compiler uses.
REPLACE_CEILL=1
fi
+ m4_ifdef([gl_FUNC_CEILL_IEEE], [
+ if test $gl_ceill_required = ieee && test $REPLACE_CEILL = 0; then
+ AC_CACHE_CHECK([whether ceill works according to ISO C 99 with IEC 60559],
+ [gl_cv_func_ceill_ieee],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $CEILL_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
+]gl_LONG_DOUBLE_SIGNBIT_CODE[
+static long double dummy (long double f) { return 0; }
+int main (int argc, char *argv[])
+{
+ long double (*my_ceill) (long double) = argc ? ceill : dummy;
+ /* Test whether ceill (-0.3L) is -0.0L. */
+ if (signbitl (minus_zerol) && !signbitl (my_ceill (-0.3L)))
+ return 1;
+ return 0;
+}
+ ]])],
+ [gl_cv_func_ceill_ieee=yes],
+ [gl_cv_func_ceill_ieee=no],
+ [gl_cv_func_ceill_ieee="guessing no"])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_ceill_ieee" in
+ *yes) ;;
+ *) REPLACE_CEILL=1 ;;
+ esac
+ fi
+ ])
else
- REPLACE_CEILL=1
+ HAVE_DECL_CEILL=0
fi
- if test $REPLACE_CEILL = 1; then
- AC_LIBOBJ([ceill])
- CEILL_LIBM=
+ if test $HAVE_DECL_CEILL = 0 || test $REPLACE_CEILL = 1; then
+ dnl Find libraries needed to link lib/ceill.c.
+ if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+ AC_REQUIRE([gl_FUNC_CEIL])
+ CEILL_LIBM="$CEIL_LIBM"
+ else
+ CEILL_LIBM=
+ fi
fi
- AC_SUBST([REPLACE_CEILL])
AC_SUBST([CEILL_LIBM])
])
# Sets CEILL_LIBM.
AC_DEFUN([gl_FUNC_CEILL_LIBS],
[
- AC_CACHE_VAL([gl_cv_func_ceill_libm], [
+ gl_CACHE_VAL_SILENT([gl_cv_func_ceill_libm], [
gl_cv_func_ceill_libm=?
- AC_TRY_LINK([
- #ifndef __NO_MATH_INLINES
- # define __NO_MATH_INLINES 1 /* for glibc */
- #endif
- #include <math.h>
- long double x;],
- [x = ceill(x);],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ long double x;]],
+ [[x = ceill(x);]])],
[gl_cv_func_ceill_libm=])
if test "$gl_cv_func_ceill_libm" = "?"; then
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
- AC_TRY_LINK([
- #ifndef __NO_MATH_INLINES
- # define __NO_MATH_INLINES 1 /* for glibc */
- #endif
- #include <math.h>
- long double x;],
- [x = ceill(x);],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ long double x;]],
+ [[x = ceill(x);]])],
[gl_cv_func_ceill_libm="-lm"])
LIBS="$save_LIBS"
fi