[CMake] INCLUDE_DIRECTORIES in sub-directories doesn't work?

[Bill Hoffman]

Bill Hoffman wrote:
> Sean Soria wrote:
>> No, this doesn't work either:
>> CMakeLists.txt:
>> ADD_SUBDIRECTORY(foo)
>> ADD_EXECUTABLE(hello main.c foo/main.c)
>>
>> foo/CMakeLists.txt:
>> SET_PROPERTY(SOURCE main.c PROPERTY INCLUDE_DIRECTORIES
>> ${CMAKE_CURRENT_SOURCE_DIR})
>>
> 
> I might be missing something but why not:
> 
> INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/foo)
> ADD_EXECUTABLE(hello main.c foo/main.c)
> 

OK, so I think I just figured out what you are trying to do....

You want two source files in the same target to have different -I flags. 
   There is not really a good way to do that in CMake right now.

You could use the source file property COMPILE_FLAGS, but it might not 
be that portable.   I find it odd that you would need to do something 
like this...   Also, the example seems to have two main.c in one 
executable which is also odd...

-Bill