X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ftrunc.m4;h=62311015b75136d401386c80c39d26e8f07cb581;hb=466449b04ceeb8c245a7e364f9c2c812a5259c8f;hp=6197df5217c57b6c4e457161f9e8d0db4f5a8612;hpb=0c5e7922f80eae16b5a89233d5a8c0d1f88c18a7;p=gnulib.git

diff --git a/m4/trunc.m4 b/m4/trunc.m4
index 6197df521..62311015b 100644
--- a/m4/trunc.m4
+++ b/m4/trunc.m4
@@ -1,5 +1,5 @@
-# trunc.m4 serial 5
-dnl Copyright (C) 2007, 2010 Free Software Foundation, Inc.
+# trunc.m4 serial 7
+dnl Copyright (C) 2007, 2010-2011 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.
@@ -56,10 +56,12 @@ AC_DEFUN([gl_FUNC_TRUNC],
 #include <math.h>
 ]gl_DOUBLE_MINUS_ZERO_CODE[
 ]gl_DOUBLE_SIGNBIT_CODE[
-int main()
+static double dummy (double f) { return 0; }
+int main (int argc, char *argv[])
 {
+  double (*my_trunc) (double) = argc ? trunc : dummy;
   /* Test whether trunc (-0.0) is -0.0.  */
-  if (signbitd (minus_zerod) && !signbitd (trunc (minus_zerod)))
+  if (signbitd (minus_zerod) && !signbitd (my_trunc (minus_zerod)))
     return 1;
   return 0;
 }
@@ -79,7 +81,7 @@ int main()
     HAVE_DECL_TRUNC=0
   fi
   if test $HAVE_DECL_TRUNC = 0 || test $REPLACE_TRUNC = 1; then
-    AC_LIBOBJ([trunc])
+    dnl No libraries are needed to link lib/trunc.c.
     TRUNC_LIBM=
   fi
   AC_SUBST([TRUNC_LIBM])