[CMake] Settings different flags in sub projects

[Glenn Coombs]

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 <david at 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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