[CMake] CMAKE_CXX_COMPILER_VERSION quite a useful variable, right?

[Petr Kmoch]

Hi Niels.

I can't comment on the "useful variable" list, but I'd just like to point
out that the variable is not undocumented. It's listed normally in the
"variables for languages" section (
http://www.cmake.org/cmake/help/v3.2/manual/cmake-variables.7.html#variables-for-languages)
of the documentation as CMAKE_<LANG>_COMPILER_VERSION; that's because it
can be set for all enabled languages, not just CXX.

http://www.cmake.org/cmake/help/v3.2/variable/CMAKE_LANG_COMPILER_VERSION.html

Petr

On Thu, May 14, 2015 at 6:18 PM, Niels Dekker - address until 2018 <
niels_dekker_address_until_2018 at xs4all.nl> wrote:

> When CMake (current version: 3.2.2) generates project files for Visual
> Studio, it appears to define an undocumented variable that seems quite
> useful to me: CMAKE_CXX_COMPILER_VERSION. It appears to be the full
> compiler version. For example, for my VS2010 installation,
> CMAKE_CXX_COMPILER_VERSION is "16.0.40219.1", and for my VS2013
> installation, CMAKE_CXX_COMPILER_VERSION is "18.0.31101.0".
>
> It seems useful to me to pass this CMake variable to the resource
> compiler, which does not have direct access to the macro's predefined by
> the C++ compiler (like _MSC_FULL_VER and _MSC_BUILD), for example by adding
> a "-D" flag:
>
> add_definitions(-DMY_COMPILER_VERSION="${CMAKE_CXX_COMPILER_VERSION}")
>
> Do you agree that it would be a good idea to add
> CMAKE_CXX_COMPILER_VERSION to the list of useful CMake variables, at
> http://www.cmake.org/Wiki/CMake_Useful_Variables ?
>
>
> Kind regards, Niels
> --
> Niels Dekker
> Scientific programmer at LKEB
> Leiden University Medical Center
> --
>
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