bzr commit into mysql-6.0-falcon-team branch (olav:2916) Bug#39419

[Olav Sandstaa]

#At file:///home/os136802/mysql/develop/repo/falcon-bug39419/ based on
revid:john.embretsen@stripped

 2916 Olav Sandstaa	2008-11-25
      Bug#39419 Falcon should not be compiled if compiler or options do not support
      exceptions
                  
      Adds a check to configure that verifies that the compiler with the
      given compiler options will produce code that handles C++ exceptions. This
      test is done by running a small program that throws an catches an exception.
      If this program does not work correctly, configure will exit will an error 
      message and needs to be re-run either with correct compiler options of with
      Falcon disabled.
            
      Adds a check to the Falcon source code that tests that GCC and Windows compilers are
      compiling with C++ exceptions enabled. This test will fail during compilation if the
      compiler is not running with C++ exceptions enabled.
modified:
  storage/falcon/ha_falcon.cpp
  storage/falcon/plug.in

per-file messages:
  storage/falcon/ha_falcon.cpp
    Added compile time test for checking that C++ exceptions are enabled. Currently only 
    GCC and Microsoft compilers will be tested.
  storage/falcon/plug.in
    Added test to verify that the compiler with the given compiler options will produce
code
    that handles C++ exceptions.
=== modified file 'storage/falcon/ha_falcon.cpp'

=== modified file 'storage/falcon/ha_falcon.cpp'
--- a/storage/falcon/ha_falcon.cpp	2008-11-16 11:30:45 +0000
+++ b/storage/falcon/ha_falcon.cpp	2008-11-25 13:38:06 +0000
@@ -1,4 +1,4 @@
-/* Copyright (C) 2006, 2007 MySQL AB
+/* Copyright (C) 2006, 2007 MySQL AB, 2008 Sun Microsystems, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -46,6 +46,11 @@
 #include "ScaledBinary.h"
 #include "BigInt.h"
 
+/* Verify that the compiler options have enabled C++ exception support */
+#if (defined(__GNUC__) && !defined(__EXCEPTIONS)) || (defined (_MSC_VER)
&& !defined (_CPPUNWIND))
+#error Falcon needs to be compiled with support for C++ exceptions. Please check your
compiler settings.
+#endif
+
 //#define NO_OPTIMIZE
 #define VALIDATE
 //#define DEBUG_BACKLOG

=== modified file 'storage/falcon/plug.in'
--- a/storage/falcon/plug.in	2008-11-03 08:56:28 +0000
+++ b/storage/falcon/plug.in	2008-11-25 13:38:06 +0000
@@ -106,9 +106,6 @@
     )
   ])
 
-  CXXFLAGS=$ac_save_CXXFLAGS
-  AC_LANG_POP([C++])
-
   # Falcon uses exceptions and STL.
   CXXLDFLAGS="$CXXLDFLAGS $falcon_cxx_enable_stl"
   FALCON_CXXFLAGS="$falcon_cxx_no_invalid_offsetof $falcon_cxx_enable_implicit_templates
$falcon_cxx_enable_exceptions"
@@ -119,6 +116,34 @@
 
   AC_SUBST([FALCON_CXXFLAGS])
 
+  # Check that C++ exceptions works in an executable by actually running a
+  # compiled program and throwing and catching an exception
+  CXXFLAGS=$FALCON_CXXFLAGS
+  AC_CACHE_CHECK([if compiler and compiler options support C++ exceptions for Falcon],
+	            falcon_supported_by_compiler,[
+  AC_TRY_RUN([
+    int main() {
+      try {
+        throw 1;
+      }
+      catch (int) {
+        return 0;
+      }
+      return -1; 
+    }
+  ], falcon_supported_by_compiler="yes",
+     falcon_supported_by_compiler="no", )
+  ])
+
+  if test "$falcon_supported_by_compiler" != "yes"; then
+    echo "Falcon must be compiled with support for C++ exceptions enabled."
+    echo "Please adjust your compiler flags or disable support for Falcon
(--without-plugin-falcon)."
+    exit 1
+  fi
+
+  CXXFLAGS=$ac_save_CXXFLAGS
+  AC_LANG_POP([C++])
+
   # When compiling with Sun Studio compiler on SPARC assembly code for
   # Interlock operations needs to be included. This has been implemented 
   # as "inline templates" in a separate file