RE: repository revision -> header file?

Ralf W. Grosse-Kunstleve [mailto:rwgk@yahoo.com] wrote:
> I see SVN maintains a global revision number for a repository. I'd
> like to access this revision number via a C or C++ header file, e.g.
>
> myproj/version.h:
>
> #define MYPROJ_REPOSITORY_REVISION $RepositoryRevision$
>
> I.e. each time svn update is run, I'd like to get the same number
> that is printed at the end ("Updated to revision 4548."):
>
> #define MYPROJ_REPOSITORY_REVISION 4548
>
> This would allow me to easily adjust to evolving library code:
>
> #include <myproj/version.h>
> #if MYPROJ_REPOSITORY_REVISION < 4548
> // use old interfaces
> #else
> // use new interfaces
> #endif

You will probably find this doesn't work.
You may have many branches which are based on old interfaces,
but the repository has only one revision number, so the repository
revision for all of them them will be the same as for branches which use
new interfaces. (Also, before you commit, it will be difficult to know
what the range check number should be, unless there are no other people
checking in to your repository.)

Use more applicable feature test macros, such as:
#ifdef USE_NEW_INTERFACES

-- 
Andrew Gabriel
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