Re: [CMake] Settings different flags in sub projects

David Zemon Mon, 04 Aug 2014 16:49:17 -0700

Poking around some more I think I may have found a better solution.


   # Toolchain file
   include(FileWithInitFlags.cmake)
   set(CMAKE_C_COMPILE_OBJECT
   "<CMAKE_C_COMPILER> <DEFINES> <FLAGS> ${CMAKE_C_FLAGS_INIT} -o
   <OBJECT> -c <SOURCE>")

And for the custom languages I can add that toCMake<Lang>Information.cmake. I'm not sure why I didn't think of thisearlier - I think just sparking off Glenn or getting some sleep helped :P


Cheers,
David

On 08/04/2014 05:09 PM, Glenn Coombs wrote:

Something like this should work:

add_compile_options(-std=c99)

set_property(DIRECTORY "/root/p1" PROPERTY COMPILE_OPTIONS "-Os")
set_property(DIRECTORY "/root/p2" PROPERTY COMPILE_OPTIONS "-O1")


or you just use the add_compile_options command in all 3 CMakeLists.txt files.  
The CMakeLists.txt files in root/p1 and root/p2 will inherit the compile 
options set in the parent root/CMakeLists.txt file.


--
Glenn

On 3 August 2014 23:46, David Zemon <da...@zemon.name<mailto:da...@zemon.name>> wrote:


    Hello,

    For the simple case of three directories and two projects - /root,
    /root/p1, and /root/p2 - I would like to set some common flags for
    both projects and then other flags should be independent. For
    instance, p1 should be compiled with "-std=c99 -Os" and p2 should
    be compiled with "-std=c99 -O1". The first flag, -std=c99, is
    common to all projects and the second, -Os, might be changed from
    project to project. How do I do this?

    I thought I could create MyRulesOverride.cmake with the content:

        set(CMAKE_C_FLAGS_INIT "-std=c99")

    And that would be the end of it, but apparently not. The
    CMakeLists.txt files in each project have a line such as "
    set(CMAKE_C_FLAGS "-Os")" which is apparently overwriting the
    cached value from CMakeCInformation.cmake. I can't write a line
    like "set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Os")" because then the
    result is "-std=c99 -std=c99 -Os" for the second project.

    Any help would be greatly appreciated.

    David

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Re: [CMake] Settings different flags in sub projects

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