[CMake] compiler defines for sub projects

[Keith Gardner]

If you want to have all of the sub directories to have the defines present, you could use ADD_DEFINITIONS().

option(FOO_OPTION "enable foo" OFF)
option(BAR_OPTION "enable bar" OFF)

if(FOO_OPTION)
     add_definitions("-DFOO_X" )
elseif(BAR_OPTION)
     add_definitions("-DFOO_Y")
else()
     add_definitions("-DOTHER")
endif()

-----Original Message-----
From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf Of Olaf Peter
Sent: Friday, April 05, 2013 12:58 PM
To: cmake at cmake.org
Subject: [CMake] compiler defines for sub projects

Hello,

is it possible to inherit compiler defines for sub projects in sub directories?

I have a library project which can be configured at compile time using preprocessor defines (cmake option)

option(FOO_OPTION "enable foo" OFF)
option(BAR_OPTION "enable bar" OFF)


if(FOO_OPTION)
     set_target_properties(my_lib PROPERTIES COMPILE_DEFINITIONS "FOO_X" )
elseif(BAR_OPTION)
     set_target_properties(my_lib PROPERTIES COMPILE_DEFINITIONS "FOO_Y")
else()
     set_target_properties(my_lib PROPERTIES COMPILE_DEFINITIONS "OTHER" )
endif()

now, in the sub of this I have unit tests which need to know about this compile defs, hence I have the same if/else again.

Is there an easy way for this?

Thanks,
Olaf
--

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