New module 'atan2f'.

[gnulib.git] / m4 / roundl.m4

diff --git a/m4/roundl.m4 b/m4/roundl.m4
index 4f47e33..eece9d7 100644 (file)
--- a/m4/roundl.m4
+++ b/m4/roundl.m4
@@ -1,4 +1,4 @@
-# roundl.m4 serial 10
+# roundl.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,
@@ -10,7 +10,7 @@ AC_DEFUN([gl_FUNC_ROUNDL],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   dnl Persuade glibc <math.h> to declare roundl().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  AC_CHECK_DECLS([roundl], , , [#include <math.h>])
+  AC_CHECK_DECLS([roundl], , , [[#include <math.h>]])
   if test "$ac_cv_have_decl_roundl" = yes; then
     gl_CHECK_MATH_LIB([ROUNDL_LIBM], [x = roundl (x);])
     if test "$ROUNDL_LIBM" = missing; then
@@ -35,10 +35,14 @@ static long double dummy (long double f) { return 0; }
 int main (int argc, char *argv[])
 {
   long double (*my_roundl) (long double) = argc ? roundl : dummy;
+  int result = 0;
   /* Test whether roundl (-0.0L) is -0.0L.  */
   if (signbitl (minus_zerol) && !signbitl (my_roundl (minus_zerol)))
-    return 1;
-  return 0;
+    result |= 1;
+  /* Test whether roundl (-0.3L) is -0.0L.  */
+  if (signbitl (-0.3L) && !signbitl (my_roundl (-0.3L)))
+    result |= 2;
+  return result;
 }
               ]])],
               [gl_cv_func_roundl_ieee=yes],
@@ -57,7 +61,7 @@ int main (int argc, char *argv[])
   fi
   if test $HAVE_DECL_ROUNDL = 0 || test $REPLACE_ROUNDL = 1; then
     dnl Find libraries needed to link lib/roundl.c.
-    AC_CHECK_DECLS([ceill, floorl], , , [#include <math.h>])
+    AC_CHECK_DECLS([ceill, floorl], , , [[#include <math.h>]])
     if test "$ac_cv_have_decl_floorl" = yes \
        && test "$ac_cv_have_decl_ceill" = yes; then
       gl_FUNC_FLOORL_LIBS