[CMake] Get Visual Studio target Arch

[Gilles Khouzam]

Hi Greg,

You might want to check out our current fork of CMake on http://cmakems.codeplex.com. I've just added support for multiplatform support for Windows Phone and Windows Store app in a similar way that it is done for iOS.

You can try the build on http://cmakems.codeplex.com/releases/view/132284 or use the MSMultiPlatform branch. This will generate one solution that can target Win32/ARM/x64 placing each architecture in a folder based on the platform name (using the $(Platform) variable in VS. 

To enable this, add the following define: CMAKE_VS_EFFECTIVE_PLATFORMS=Win32;ARM;x64 and code for all three platforms will be generated. We'd love to understand the type of issues you might run into with this and how we can make it better.

Thanks
~Gilles

-----Original Message-----
From: CMake [mailto:cmake-bounces at cmake.org] On Behalf Of Gregor Jasny
Sent: Monday, September 8, 2014 12:06
To: cmake at cmake.org; Alexey Petruchik
Subject: Re: [CMake] Get Visual Studio target Arch

On 06/09/14 16:02, Alexey Petruchik wrote:
> I want to use different library folders for x64/x86/arm architectures.
> Cmake has different generators for each arch: "Visual Studio 12 2013", 
> "Visual Studio 12 2013 ARM", "Visual Studio 12 2013 Win64". Is there 
> any cmake var to get visual studio target arch? CMAKE_SYSTEM_PROCESSOR 
> is always AMD64 for me no matter what generator I'm using.

All the already available stuff in cmake is not sufficient. Especially if you start to cross compile.

I use the pre-defined C/C++ preprocessor symbols for that:

include(CheckSymbolExists)

if(WIN32)
  check_symbol_exists("_M_AMD64" "" RTC_ARCH_X64)
  if(NOT RTC_ARCH_X64)
    check_symbol_exists("_M_IX86" "" RTC_ARCH_X86)
  endif(NOT RTC_ARCH_X64)
  # add check for arm here
  # see http://msdn.microsoft.com/en-us/library/b0084kay.aspx
else(WIN32)
  check_symbol_exists("__i386__" "" RTC_ARCH_X86)
  check_symbol_exists("__x86_64__" "" RTC_ARCH_X64)
  check_symbol_exists("__arm__" "" RTC_ARCH_ARM)
endif(WIN32)

Now you could write:

if(RTC_ARCH_X64)
  set(MY_LIB_DIR x64)
elseif(RTC_ARCH_X86)
  set(MY_LIB_DIR x86)
elseif(RTC_ARCH_ARM)
  set(MY_LIB_DIR x86)
else()
  message(FATAL_ERROR "Unknown architecture")
endif()

I hope this helps.

Thanks,
Gregor
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