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, 1 insertions, 2 deletions

diff --git a/SConstruct b/SConstruct
index d168820f66..0c85023b21 100644
--- a/SConstruct
+++ b/SConstruct
@@ -16,7 +16,6 @@ platform_list = [] # list of platforms
 platform_opts = {} # options for each platform
 platform_flags = {} # flags for each platform
 
-
 active_platforms=[]
 active_platform_ids=[]
 platform_exporters=[]
@@ -60,7 +59,7 @@ platform_arg = ARGUMENTS.get("platform", False)
 if (os.name=="posix"):
 	pass
 elif (os.name=="nt"):
-	if (os.getenv("VSINSTALLDIR")==None or platform_arg=="android"):
+	if (not methods.msvc_is_detected() or platform_arg=="android"):
 		custom_tools=['mingw']
 
 env_base=Environment(tools=custom_tools);