[PATCH] lib: add library version check macro

[Tomi Ollila]

On Wed, Nov 06 2013, Jani Nikula <jani at nikula.org> wrote:

> There have been some plans for making build incompatible changes to
> the library API. This is inconvenient, but it is much more so without
> a way to easily conditional build against multiple versions of
> notmuch.
>
> The macro has been lifted from glib.

+1

Tomi


> ---
>  lib/notmuch.h | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>
> diff --git a/lib/notmuch.h b/lib/notmuch.h
> index 9dab555..d109a2c 100644
> --- a/lib/notmuch.h
> +++ b/lib/notmuch.h
> @@ -41,6 +41,30 @@ NOTMUCH_BEGIN_DECLS
>  #define TRUE 1
>  #endif
>  
> +#define NOTMUCH_MAJOR_VERSION	0
> +#define NOTMUCH_MINOR_VERSION	17
> +#define NOTMUCH_MICRO_VERSION	0
> +
> +/*
> + * Check the version of the notmuch library being compiled against.
> + *
> + * Return true if the library being compiled against is of the
> + * specified version or above. For example:
> + *
> + * #if NOTMUCH_CHECK_VERSION(0, 18, 0)
> + *     (code requiring notmuch 0.18 or above)
> + * #endif
> + *
> + * NOTMUCH_CHECK_VERSION has been defined since version 0.17.0; you
> + * can use #if !defined(NOTMUCH_CHECK_VERSION) to check for versions
> + * prior to that.
> + */
> +#define NOTMUCH_CHECK_VERSION (major, minor, micro)			\
> +    (NOTMUCH_MAJOR_VERSION > (major) ||					\
> +     (NOTMUCH_MAJOR_VERSION == (major) && NOTMUCH_MINOR_VERSION > (minor)) || \
> +     (NOTMUCH_MAJOR_VERSION == (major) && NOTMUCH_MINOR_VERSION == (minor) && \
> +      NOTMUCH_MICRO_VERSION >= (micro)))
> +
>  typedef int notmuch_bool_t;
>  
>  /* Status codes used for the return values of most functions.
> -- 
> 1.8.4.rc3
>
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