Note that support for building with VC++ 2010 is not yet complete

1 files changed, 12 insertions, 1 deletions

diff --git a/README.win32 b/README.win32
index b40dc49107..fb2b05cf63 100644
--- a/README.win32
+++ b/README.win32
@@ -40,10 +40,18 @@ system).  Currently, this port is capable of using one of the
 following compilers on the Intel x86 architecture:
 
       Borland C++             version 5.02 or later
-      Microsoft Visual C++    version 6.0 or later
+      Microsoft Visual C++    version 6.0 or later (*)
       Gcc by mingw.org        gcc version 3.2 or later
       Gcc by mingw-w64.sf.net gcc version 4.4.3 or later
 
+(*) NOTE: Support for Visual C++ 2010 is not yet complete. This latest
+version of VC++ introduces some new C<errno.h> constants which conflict
+with Perl's current setting of them to match the corresponding WSAE*
+constants' values. Until this issue is resolved you will see several test
+failures (in F<cpan/autodie/t/flock.t>, F<dist/IO/t/io_multihomed.t >,
+F<dist/Net-Ping/t/450_service.t> and F<dist/Net-Ping/t/510_ping_udp.t>)
+and experience other problems in code involving sockets.
+
 Note that the last two of these are actually competing projects both
 delivering complete gcc toolchain for MS Windows:
 
@@ -407,6 +415,9 @@ the testsuite (many tests will be skipped).
 
 There should be no test failures.
 
+(If you're using VC++ 2010 then you will currently see several test failures,
+as noted in the list of supported compilers above.)
+
 Some test failures may occur if you use a command shell other than the
 native "cmd.exe", or if you are building from a path that contains
 spaces.  So don't do that.