[CMake] CMake 3.6.0-rc4 now ready for testing!

[Brad King]

On 06/29/2016 05:05 PM, Hendrik Sattler wrote:
>> * The "InstallRequiredSystemLibraries" module learned a new
>>  "CMAKE_INSTALL_UCRT_LIBRARIES" option to enable app-local deployment
>>  of the Windows Universal CRT libraries with Visual Studio 2015.
>  
> Maybe the help should note that this is only needed when targeting
> WindowsXP.

It is also useful for deploying to Windows 7 machines that have
not had updates installed to provide the UCRT libraries.  I've
updated the documentation to show Windows XP as an example:

 InstallRequiredSystemLibraries: Document UCRT option use case
 https://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=dab3ccf2

>> * A "CMAKE_TRY_COMPILE_PLATFORM_VARIABLES" variable was added for
>>  use by toolchain files to specify platform-specific variables that
>>  must be propagated by the "try_compile()" command into test
>>  projects.
> 
> Can someone please add an example to the help.

Done:

 Help: Document CMAKE_TRY_COMPILE_PLATFORM_VARIABLES example
 https://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=c05d240e

> E.g. I tried to make the initial try_compile() to respect my
> CMAKE_CXX_FLAGS_INIT variable that gets defined in my toolchain file...

CMAKE_CXX_FLAGS_INIT is not documented for use in a toolchain file.
It is used internally by platform modules.

> I really have to use CXXFLAGS environment variable which feels clumsy.
> It's that really the only reliable way to define compiler arguments
> like -mcpu= for all compiler invocations?

It is one way.  Another way is to set the cache entry directly:

  set(CMAKE_CXX_FLAGS "-mcpu=..." CACHE STRING "C++ flags")

Note that CMAKE_CXX_FLAGS is propagated by try_compile automatically.
The above two approaches are actually just trying to get a toolchain
file to have a say in the initial CMAKE_CXX_FLAGS cache entry value
of the main project.

-Brad