[PATCH] version.h: Add version check macro

[Kristian Høgsberg]

On Wed, Aug 21, 2013 at 08:17:05AM +0200, Pier Luigi Fiorini wrote:
> Make it easier to check for a Weston version.
> ---
>  src/version.h.in | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/src/version.h.in b/src/version.h.in
> index f573328..12ad6e4 100644
> --- a/src/version.h.in
> +++ b/src/version.h.in
> @@ -26,6 +26,13 @@
>  #define WESTON_VERSION_MAJOR @WESTON_VERSION_MAJOR@
>  #define WESTON_VERSION_MINOR @WESTON_VERSION_MINOR@
>  #define WESTON_VERSION_MICRO @WESTON_VERSION_MICRO@
> -#define WESTON_VERSION "@WESTON_VERSION@"
> +
> +#define WESTON_VERSION ((WESTON_VERSION_MAJOR << 16) | (WESTON_VERSION_MINOR << 8) | (WESTON_VERSION_MICRO))
> +#define WESTON_VERSION_STR "@WESTON_VERSION@"
> +
> +/*
> +    Can be used like #if (WESTON_VERSION >= WESTON_VERSION_CHECK(1, 2, 0))
> +*/
> +#define WESTON_VERSION_CHECK(major, minor, micro) ((major << 16) | (minor << 8) | (micro))

Not sure about this... we don't guarantee stable plugin-API between
major weston releases (1.1 and 1.2, for example) so it doesn't make
sense to check if the version is at least 1.2.2, for example.  Within
a stable branch, we done change the plugin API/ABI, so what you can
check for is a specific major and minor version and a minimum micro
version.

I'd suggest something linke

#define WESTON_VERSION_AT_LEAST(major, minor, micro) \
	(WESTON_VERSION_MAJOR == (major) && \
	 WESTON_VERSION_MINOR == (minor) && \
	 WESTON_VERSION_MICRO >= (micro))

Does that work?

Kristian