[CMake] VC2015 and Windows 7 compatibility

[Elvis Stansvik]

2017-09-19 17:50 GMT+02:00 Gonzalo Garramuño <ggarra13 at gmail.com>:
> I compile on Windows 8.1.  I just found out that my program does not work on
> Windows 7 after I upgraded my toolchain to VC2015. Users of my program on
> Windows 7 get:
>
> Missing DLL ms-api-win-core-libraryloader-l1-2-0.dll
>
> After some digging, I found out that it can be because the use of SDK Sets
> on win8.1.  And that perhaps setting the compiler compatibility to WinXP
> should fix it.  However, I don't know how to do that from cmake.

I also build on Win 8.1/MSVC 2015, targeting Windows 7+, and what I do
is basically:

if(WIN32)
    add_definitions(/D_WIN32_WINNT=0x0601) # Target Windows 7+

    set(CMAKE_INSTALL_SYSTEM_RUNTIME_DESTINATION ".")
    set(CMAKE_INSTALL_UCRT_LIBRARIES ON)
    include(InstallRequiredSystemLibraries)
endif()

The /D_WIN32_WINNT=0x0601 is what ensures Windows 7 compatibility and
CMAKE_INSTALL_UCRT_LIBRARIES is what ensures Universal CRT libraries
like the one you mentioned gets installed alongside the application.

You'll end up with a truckload of such small DLLs, but AFAIK this is
what you need to do if you want to do app-local deployment of the
Universal CRT.

Hope that helps.

Elvis

>
> Any ideas?
>
> If you want to see my CMakeLists.txt, you can get the code with:
>
> $ git clone ssh://ggarra13@git.code.sf.net/p/mrviewer/code mrviewer-code
>
>
> --
> Gonzalo Garramuño
>
> --
>
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