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extern/stdcxx/4.2.1/etc/config/windows/fun_present_check.cpp

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+
+/***************************************************************************
+ *
+ * Licensed to the Apache Software  Foundation (ASF) under one or more
+ * contributor  license agreements.  See  the NOTICE  file distributed
+ * with  this  work  for  additional information  regarding  copyright
+ * ownership.   The ASF  licenses this  file to  you under  the Apache
+ * License, Version  2.0 (the  License); you may  not use  this file
+ * except in  compliance with the License.   You may obtain  a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the  License is distributed on an  "AS IS" BASIS,
+ * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
+ * implied.   See  the License  for  the  specific language  governing
+ * permissions and limitations under the License.
+ *
+ * Copyright 1999-2007 Rogue Wave Software, Inc.
+ * 
+ **************************************************************************/
+
+extern "C"
+{
+    typedef void (*funptr_t)();
+}
+
+// take the address of the function in a way
+// that foils even clever optimizers
+
+union {
+    funptr_t      pf;
+    unsigned long ul;
+} funptri;
+
+#ifdef CHECK_DECL
+
+#  if defined (__linux__) && defined (__GNUG__) && __GNUG__ < 3
+     // prevent empty exception specifications from triggering
+     // gcc 2.9x -fhonor-std link errors looking for std::terminate()
+#    include <features.h>
+#    undef __THROW
+#    define __THROW
+#  endif   // gcc < 3 on Linux
+
+#  include HDRNAME
+
+#  ifndef NONAMESPACE
+
+namespace std { }
+using namespace std;
+
+#  endif   // NONAMESPACE
+
+int main (int argc, char**)
+{
+    // with gcc, prevent intrinsics from causing false positives
+
+#  if TAKE_ADDR
+
+    funptri.pf = (funptr_t)&FUNNAME;
+
+    return (argc < 1 ? !funptri.ul : !!funptri.ul) + 0;
+    
+#  else   // if !TAKE_ADDR
+
+    // disable warnings about an unused variable
+    (void)&argc;
+
+    // call the function using the supplied arguments
+    #ifdef FUN_PARAMS
+        FUN_PARAMS;
+    #endif
+    (void)FUN;
+
+    return 0;
+
+#  endif   // TAKE_ADDR
+
+}
+
+#else   // if !defined (CHECK_DECL)
+
+extern "C" void FUNNAME ();
+
+int main (int argc, char**)
+{
+    funptri.pf = (funptr_t)&FUNNAME;
+
+    return (argc < 1 ? !funptri.ul : !!funptri.ul) + 0;
+}
+
+#endif   // CHECK_DECL
+
+