X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffloorf.m4;h=83bfc78bc59c5ed9f57fa3e09da0d729ebae9706;hb=9723bfe9bb9af8309314ad6230f7661000ba03b1;hp=ac49a829df9915e4e9eeece49968108542a5d7e3;hpb=d599e5add275f75ed08e6527b8ee4d3f4f7c3aea;p=gnulib.git

diff --git a/m4/floorf.m4 b/m4/floorf.m4
index ac49a829d..83bfc78bc 100644
--- a/m4/floorf.m4
+++ b/m4/floorf.m4
@@ -1,4 +1,4 @@
-# floorf.m4 serial 8
+# floorf.m4 serial 11
 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,
@@ -11,7 +11,7 @@ AC_DEFUN([gl_FUNC_FLOORF],
   dnl Persuade glibc <math.h> to declare floorf().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
   dnl Test whether floorf() is declared.
-  AC_CHECK_DECLS([floorf], , , [#include <math.h>])
+  AC_CHECK_DECLS([floorf], , , [[#include <math.h>]])
   if test "$ac_cv_have_decl_floorf" = yes; then
     dnl Test whether floorf() can be used without libm.
     gl_FUNC_FLOORF_LIBS
@@ -35,10 +35,12 @@ AC_DEFUN([gl_FUNC_FLOORF],
 #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_floorf) (float) = argc ? floorf : dummy;
   /* Test whether floorf (-0.0f) is -0.0f.  */
-  if (signbitf (minus_zerof) && !signbitf (floorf (minus_zerof)))
+  if (signbitf (minus_zerof) && !signbitf (my_floorf (minus_zerof)))
     return 1;
   return 0;
 }
@@ -58,7 +60,7 @@ int main()
     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])