-# floorf.m4 serial 6
-dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
+# floorf.m4 serial 10
+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_FLOORF],
[
+ m4_divert_text([DEFAULTS], [gl_floorf_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare floorf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl libm.so, but not in the libm.so that the compiler uses.
REPLACE_FLOORF=1
fi
+ m4_ifdef([gl_FUNC_FLOORF_IEEE], [
+ if test $gl_floorf_required = ieee && test $REPLACE_FLOORF = 0; then
+ AC_CACHE_CHECK([whether floorf works according to ISO C 99 with IEC 60559],
+ [gl_cv_func_floorf_ieee],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $FLOORF_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+]gl_FLOAT_MINUS_ZERO_CODE[
+]gl_FLOAT_SIGNBIT_CODE[
+static float dummy (float f) { return 0; }
+int main (int argc, char *argv[])
+{
+ float (*my_floorf) (float) = argc ? floorf : dummy;
+ /* Test whether floorf (-0.0f) is -0.0f. */
+ if (signbitf (minus_zerof) && !signbitf (my_floorf (minus_zerof)))
+ return 1;
+ return 0;
+}
+ ]])],
+ [gl_cv_func_floorf_ieee=yes],
+ [gl_cv_func_floorf_ieee=no],
+ [gl_cv_func_floorf_ieee="guessing no"])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_floorf_ieee" in
+ *yes) ;;
+ *) REPLACE_FLOORF=1 ;;
+ esac
+ fi
+ ])
else
HAVE_DECL_FLOORF=0
fi
if test $HAVE_DECL_FLOORF = 0 || test $REPLACE_FLOORF = 1; then
- AC_LIBOBJ([floorf])
+ dnl No libraries are needed to link lib/floorf.c.
FLOORF_LIBM=
fi
AC_SUBST([FLOORF_LIBM])
[
gl_CACHE_VAL_SILENT([gl_cv_func_floorf_libm], [
gl_cv_func_floorf_libm=?
- AC_TRY_LINK([
- #ifndef __NO_MATH_INLINES
- # define __NO_MATH_INLINES 1 /* for glibc */
- #endif
- #include <math.h>
- float x;],
- [x = floorf(x);],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ float x;]],
+ [[x = floorf(x);]])],
[gl_cv_func_floorf_libm=])
if test "$gl_cv_func_floorf_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 = floorf(x);],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ float x;]],
+ [[x = floorf(x);]])],
[gl_cv_func_floorf_libm="-lm"])
LIBS="$save_LIBS"
fi