scons detects standalone MSVC on Windows

Under Windows, Scons is now capable of detecting and compiling with
standalone MSVC compilers (aka "Visual C++ Build Tools").
http://landinghub.visualstudio.com/visual-cpp-build-tools

Tried with version 2015, and native x86 and x64 compilers under
Windows 10 pro 64 and Windows 8.1 64, with the default Win8 SDK
provided by the "Visual C++ Build Tools" web-installer.

Follow the same compiling instructions than for compiling with Visual
Studio, except that Visual Studio is no more required.

KNOWN ISSUES :
- ``methods.detect_visual_c_compiler_version()`` will emit a warning message
on computers where the ``VSINSTALLDIR`` environement variable is not present.
But it should compile just fine and still automatically detects the 32 or
64 bits according to the compiler you picked.

TODO :
- eventually, update ``platform/winrt/dectet.py`` with function
``methods.msvc_is_detected()`` and try to compile winrt/UWP with
these standalone compilers (if you did not select Win10 SDK when
installing the standalone tools, you can run it again).
- update doc to make users aware of "Visual C++ Build Tools" aka
"stadalone MSVC".
- eventually, update ``methods.detect_visual_c_compiler_version()``

1 files changed, 16 insertions, 9 deletions

diff --git a/platform/windows/detect.py b/platform/windows/detect.py
index 0548b84cfa..12ea5a93ee 100644
--- a/platform/windows/detect.py
+++ b/platform/windows/detect.py
@@ -1,10 +1,11 @@
 #
-# 	tested on               | Windows native    | Linux cross-compilation
-#	------------------------+-------------------+---------------------------
-#	MSVS C++ 2010 Express   | WORKS             | n/a
-#	Mingw-w64               | WORKS             | WORKS
-#	Mingw-w32               | WORKS             | WORKS
-#	MinGW                   | WORKS             | untested
+# 	tested on                   | Windows native    | Linux cross-compilation
+#	----------------------------+-------------------+---------------------------
+#	MSVS C++ 2010 Express       | WORKS             | n/a
+#   Visual C++ Build Tools 2015 | WORKS             | n/a
+#	Mingw-w64                   | WORKS             | WORKS
+#	Mingw-w32                   | WORKS             | WORKS
+#	MinGW                       | WORKS             | untested
 #
 #####
 # Notes about MSVS C++ :
@@ -12,6 +13,12 @@
 # 	- MSVC2010-Express compiles to 32bits only.
 #
 #####
+# Note about Visual C++ Build Tools :
+#
+#	- Visual C++ Build Tools is the standalone MSVC compiler :
+#		http://landinghub.visualstudio.com/visual-cpp-build-tools
+#
+#####
 # Notes about Mingw-w64 and Mingw-w32 under Windows :
 #
 #	- both can be installed using the official installer :
@@ -78,7 +85,7 @@
 
 #####
 # TODO :
-#
+# 
 #	- finish to cleanup this script to remove all the remains of previous hacks and workarounds
 #	- make it work with the Windows7 SDK that is supposed to enable 64bits compilation for MSVC2010-Express
 #	- confirm it works well with other Visual Studio versions.
@@ -102,7 +109,7 @@ def can_build():
 
 	if (os.name=="nt"):
 		#building natively on windows!
-		if (os.getenv("VSINSTALLDIR")):
+		if ( methods.msvc_is_detected() ):
 			return True
 		else:
 			print("\nMSVC not detected, attempting Mingw.")
@@ -197,7 +204,7 @@ def configure(env):
 
 	env.Append(CPPPATH=['#platform/windows'])
 	env['is_mingw']=False
-	if (os.name=="nt" and os.getenv("VSINSTALLDIR")!=None):
+	if (os.name=="nt" and methods.msvc_is_detected() ):
 		#build using visual studio
 		env['ENV']['TMP'] = os.environ['TMP']
 		env.Append(CPPPATH=['#platform/windows/include'])