[CMake] Reading flags that have been added with add_definitions

[Andreas Schuh]

Hi Mathias,

I simply guess that the reason for COMPILE_DEFINITIONS not including
-pedantic is, that you actually use add_definitions() for something
what it is not really intended for, i.e., the addition of compiler
flags other than those which define preprocessor macros... maybe
add_definitions() recognizes it as compiler flags and adds it to
either one of the variables which define the compiler flags. Check the
value of the target property COMPILE_FLAGS on one of the targets added
after the add_definitions() call.

However, you should actually add "global" compiler flags to the
(command-line argument) srings (not CMake lists!) CMAKE_CXX_FLAGS,
CMAKE_C_FLAGS, CMAKE_CXX_<CONFIG>, CMAKE_C_FLAGS_<CONFIG>.

set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic")

Andreas

On Wed, Apr 18, 2012 at 10:23 AM, Mathias Gaunard
<mathias.gaunard at ens-lyon.org> wrote:
> Is there a way to read back what flags were added with add_definitions?
>
> If I do
>
> add_definitions(DFOO=bar -pedantic)
>
> when I read the COMPILE_DEFINITIONS property of the directory all I have is
> FOO=bar
>
> How can I know the -pedantic option is being used for all targets in the
> directory?
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