Added release note re: Visual Studio detection, MSVC_VERSION, TARGET_ARCH.

git-svn-id: http://scons.tigris.org/svn/scons/trunk@4603 fdb21ef1-2011-0410-befe-b5e4ea1792b1

diff --git a/src/RELEASE.txt b/src/RELEASE.txt
index d7bdd74ad7baf56091ede4b888f3fe7f55dd1752..b9c9fc87ed5d262c5bc21c0555db02f8a2bfc438 100644 (file)
--- a/src/RELEASE.txt
+++ b/src/RELEASE.txt
@@ -58,6 +58,28 @@ RELEASE 1.2.0.d20090223 - Mon, 23 Feb 2009 08:41:06 -0800
 
   Please note the following important changes since release 1.2.0:
 
+    --  MICROSOFT VISUAL STUDIO VERSION/ARCH DETECTION HAS CHANGED
+
+        The way SCons detects Visual Studio on Windows has changed in
+        1.3.  By default, it should now use the latest installed
+        Visual Studio version on your machine, and compile for 32 or
+        64 bits according to whether your OS is 32 or 64 bits (32/64
+        bit python makes no difference).
+
+       Two new variables control Visual Studio: MSVC_VERSION and
+       TARGET_ARCH.  These variables ONLY take effect when passed to
+       the Environment() constructor; setting them later has no
+       effect.  To use a non-default Visual Studio version, set
+       MSVC_VERSION to e.g. "8.0" or "7.1".  Setting it to "xxx" (or
+       any nonexistent value) will make it print out the valid
+       versions on your system.  To use a non-default architecture,
+       set TARGET_ARCH to "x86" or "x86_64" (various synonyms are
+       accepted).
+
+       Note that if you use MSVS_VERSION to build Visual Studio
+       projects from your SConstructs, MSVS_VERSION must be set to
+       the same version as MSVC_VERSION.
+
     --  VISUAL C/C++ PRECOMPILED HEADERS WILL BE REBUILT
 
         Precompiled header files built with Visual C/C++ will be