[CMake] using macros

[Petr Kmoch]

Hi Owen.

As a sanity check, the definition of the macro in the toplevel CMakeList
comes *before* the add_subdirectory() command for the one which errors out,
right?

Petr

On Thu, Jan 14, 2016 at 8:25 AM, Owen Hogarth II <gurenchan at gmail.com>
wrote:

> I am trying to use a macro to enable c99 in some of my cmake modules.
>
> In the top level cmake file I add this macro
>
> macro(use_c99)
>   if (CMAKE_VERSION VERSION_LESS "3.1")
>     if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
>       set (CMAKE_C_FLAGS "--std=gnu99 ${CMAKE_C_FLAGS}")
>     endif ()
>   else ()
>     set (CMAKE_C_STANDARD 99)
>   endif ()
> endmacro(use_c99)
>
> then in another CMakeLists.txt file I add
> use_c99()
>
> but I get this error:
>
> CMake Error at source/internal_src/cube/CMakeLists.txt:1 (use_c
> 99):
>   Unknown CMake command "use_c99".
>
> why am I unable to use the macro? My main cmake is using 3.0.2 from debian
> repository.
>
>
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