[CMake] Use-like inheritance

[Petr Kmoch]

Depends on who knows the directories to be included. If you're in a
situation when B doesn't know which directories A will add, you can
use global properties for this purpose. Something like this:

#-------------
project(B)
define_property(GLOBAL PROPERTY my_include_files ...)
add_subdirectory(/there/A) #1
get_property(added_by_a GLOBAL PROPERTY my_include_files) #1
include_directories(${added_by_a}) #1

#---------------
project(A)
include_directories(/there/A/include) #2
set_property(GLOBAL PROPERTY my_include_files /there/A/include) #2

#-------------

Lines marked as #1 and #2 could be encapsulated in macros, something
like "add_subdirectory_and_import_includes()" and
"set_and_import_includes()", respectively.

Petr

On Thu, Apr 19, 2012 at 8:58 PM,  <norulez at me.com> wrote:
> You could create a macro for such purpose:
>
> macro(AddAndInclude directory)
>    add_subdirectory(${directory})
>    include_directories(${directory}/include)
> endmacro(AddAndInclude)
>
> Usage:
> AddAndInclude(/there/A)
>
> Best Regards
> NoRulez
>
> Am 19.04.2012 um 16:42 schrieb Christian Arnault <arnault at lal.in2p3.fr>:
>
>> Hi,
>>
>> My simple work model is as follows:
>>
>> 1) I have two projects A & B, located in independant locations. Both provide some libraries & executable
>> 2) B makes use of libraries & headers provided in A
>>
>>
>> I want to launch the build of A together B thus I do:
>>
>> #-------------------------
>> project(B)
>> add_subdirectory (/there/A)
>> ...
>> #-------------------------
>>
>> OK!
>>
>> Then I'd like to inherit some properties of A (let's say 'include directories' !) of course I could simply say:
>>
>> #--------------------
>> project(B)
>> ...
>> add_subdirectory (/there/A)
>> include_directories (/there/A/includes)
>> add_library (MyBLib...)
>> ...
>> #----------------------
>>
>>
>> OK! this works
>>
>> Now, suppose I want rather to 'export' the include_directories property while I am within the CMakeLists.txt of A, so that, it's enough to add_subdirectory(A). such as:
>>
>> #--------------------------------
>> project(B)
>> ...
>> add_subdirectory (/there/A)
>> add_library (MyBLib...)
>> #--------------------------------
>>
>>
>> So as the include_directories property is transparently acquired.
>> How to do this in CMake ?
>> (of course, I tried many features of CMake, but perhaps I have missed some important point....)
>>
>> Thanks for any hint
>>
>> Christian
>>
>>
>>
>>
>> --
>> --------------------------------------------
>> | Christian Arnault                        |
>> | LAL Bat 200 pièce 03a                    |
>> | 91405 Orsay CEDEX                        |
>> | phone   : (33) 1 64 46 84 24             |
>> | gsm     : (33) 6 77 27 62 30             |
>> | fax     : (33) 1 69 07 94 04             |
>> | e-mail  : christian.arnault at lal.in2p3.fr |
>> --------------------------------------------
>>
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