-# ceilf.m4 serial 6
-dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
+# ceilf.m4 serial 14
+dnl Copyright (C) 2007, 2009-2013 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_CEILF],
[
+ m4_divert_text([DEFAULTS], [gl_ceilf_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare ceilf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether ceilf() is declared.
- AC_CHECK_DECLS([ceilf], , , [#include <math.h>])
+ AC_CHECK_DECLS([ceilf], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_ceilf" = yes; then
dnl Test whether ceilf() can be used without libm.
gl_FUNC_CEILF_LIBS
dnl libm.so, but not in the libm.so that the compiler uses.
REPLACE_CEILF=1
fi
+ m4_ifdef([gl_FUNC_CEILF_IEEE], [
+ if test $gl_ceilf_required = ieee && test $REPLACE_CEILF = 0; then
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether ceilf works according to ISO C 99 with IEC 60559],
+ [gl_cv_func_ceilf_ieee],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $CEILF_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+]gl_FLOAT_MINUS_ZERO_CODE[
+]gl_FLOAT_SIGNBIT_CODE[
+static float dummy (float f) { return 0; }
+int main (int argc, char *argv[])
+{
+ float (*my_ceilf) (float) = argc ? ceilf : dummy;
+ int result = 0;
+ /* Test whether ceilf (-0.0f) is -0.0f. */
+ if (signbitf (minus_zerof) && !signbitf (my_ceilf (minus_zerof)))
+ result |= 1;
+ /* Test whether ceilf (-0.3f) is -0.0f. */
+ if (signbitf (-0.3f) && !signbitf (my_ceilf (-0.3f)))
+ result |= 2;
+ return result;
+}
+ ]])],
+ [gl_cv_func_ceilf_ieee=yes],
+ [gl_cv_func_ceilf_ieee=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_ceilf_ieee="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_ceilf_ieee="guessing no" ;;
+ esac
+ ])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_ceilf_ieee" in
+ *yes) ;;
+ *) REPLACE_CEILF=1 ;;
+ esac
+ fi
+ ])
else
HAVE_DECL_CEILF=0
fi
if test $HAVE_DECL_CEILF = 0 || test $REPLACE_CEILF = 1; then
- AC_LIBOBJ([ceilf])
+ dnl No libraries are needed to link lib/ceilf.c.
CEILF_LIBM=
fi
AC_SUBST([CEILF_LIBM])
[
gl_CACHE_VAL_SILENT([gl_cv_func_ceilf_libm], [
gl_cv_func_ceilf_libm=?
- AC_TRY_LINK([
- #ifndef __NO_MATH_INLINES
- # define __NO_MATH_INLINES 1 /* for glibc */
- #endif
- #include <math.h>
- float x;],
- [x = ceilf(x);],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ float (*funcptr) (float) = ceilf;
+ float x;]],
+ [[x = funcptr(x) + ceilf(x);]])],
[gl_cv_func_ceilf_libm=])
if test "$gl_cv_func_ceilf_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>
- float x;],
- [x = ceilf(x);],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ float (*funcptr) (float) = ceilf;
+ float x;]],
+ [[x = funcptr(x) + ceilf(x);]])],
[gl_cv_func_ceilf_libm="-lm"])
LIBS="$save_LIBS"
fi