X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fceilf.m4;h=59f52f5b074d6b94ecc44165144ccf296afbd41e;hb=b892d78c38d15fd04150689de8e83b0c575f8620;hp=7b9bbcc243396942ad59f4b529ecd9bcf8434c44;hpb=f10ca7e0a421ace0dd6124bd8f0ba8e7570ebec3;p=gnulib.git

diff --git a/m4/ceilf.m4 b/m4/ceilf.m4
index 7b9bbcc24..59f52f5b0 100644
--- a/m4/ceilf.m4
+++ b/m4/ceilf.m4
@@ -1,5 +1,5 @@
-# ceilf.m4 serial 8
-dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
+# ceilf.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,
 dnl with or without modifications, as long as this notice is preserved.
@@ -11,7 +11,7 @@ AC_DEFUN([gl_FUNC_CEILF],
   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
@@ -35,12 +35,18 @@ AC_DEFUN([gl_FUNC_CEILF],
 #include <math.h>
 ]gl_FLOAT_MINUS_ZERO_CODE[
 ]gl_FLOAT_SIGNBIT_CODE[
-int main()
+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 (ceilf (minus_zerof)))
-    return 1;
-  return 0;
+  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],
@@ -58,7 +64,7 @@ int main()
     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])