-# ceill.m4 serial 2
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# ceill.m4 serial 8
+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])
dnl Persuade glibc <math.h> to declare ceill().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether ceill() can be used without libm.
gl_FUNC_CEILL_LIBS
if test "$CEILL_LIBM" = "?"; then
- CEILL_LIBM=
+ dnl Sun C 5.0 on Solaris declares ceill() and has it in the system-wide
+ 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 $CEILL_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
+]gl_LONG_DOUBLE_SIGNBIT_CODE[
+int main()
+{
+ /* Test whether ceill (-0.3L) is -0.0L. */
+ if (signbitl (minus_zerol) && !signbitl (ceill (-0.3L)))
+ return 1;
+ return 0;
+}
+ ]])],
+ [gl_cv_func_ceill_ieee=yes],
+ [gl_cv_func_ceill_ieee=no],
+ [gl_cv_func_ceill_ieee="guessing no"])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_ceill_ieee" in
+ *yes) ;;
+ *) REPLACE_CEILL=1 ;;
+ esac
+ fi
+ ])
else
HAVE_DECL_CEILL=0
+ fi
+ if test $HAVE_DECL_CEILL = 0 || test $REPLACE_CEILL = 1; then
AC_LIBOBJ([ceill])
CEILL_LIBM=
fi
- AC_SUBST([HAVE_DECL_CEILL])
AC_SUBST([CEILL_LIBM])
])
# Sets CEILL_LIBM.
AC_DEFUN([gl_FUNC_CEILL_LIBS],
[
- AC_CACHE_VAL([gl_func_ceill_libm], [
- gl_func_ceill_libm=?
- AC_TRY_LINK([
- #ifndef __NO_MATH_INLINES
- # define __NO_MATH_INLINES 1 /* for glibc */
- #endif
- #include <math.h>
- long double x;],
- [x = ceill(x);],
- [gl_func_ceill_libm=])
- if test "$gl_func_ceill_libm" = "?"; then
+ gl_CACHE_VAL_SILENT([gl_cv_func_ceill_libm], [
+ gl_cv_func_ceill_libm=?
+ 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="$LIBS -lm"
- AC_TRY_LINK([
- #ifndef __NO_MATH_INLINES
- # define __NO_MATH_INLINES 1 /* for glibc */
- #endif
- #include <math.h>
- long double x;],
- [x = ceill(x);],
- [gl_func_ceill_libm="-lm"])
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ long double x;]],
+ [[x = ceill(x);]])],
+ [gl_cv_func_ceill_libm="-lm"])
LIBS="$save_LIBS"
fi
])
- CEILL_LIBM="$gl_func_ceill_libm"
+ CEILL_LIBM="$gl_cv_func_ceill_libm"
])