Daniel Stenberg <dan...@haxx.se> writes:
> On Mon, 23 Feb 2009, Simon Josefsson wrote:
>
>> const char *libssh2_check_version (int req_version_num);
>>
>> Which could be used by applications like this:
>>
>> if (!libssh2_check_version (LIBSSH2_VERSION_NUM)) {
>> fprintf (stderr, "Runtime libssh2 version too old!\n");
>> exit(1);
>> }
>
> Right, that's a neat approach that I like.
>
>> if (debug) {
>> printf ("libssh2 %s\n", libssh2_check_version (0));
>> }
>>
>> And the string could look something like:
>>
>> "1.0.1-CVS/gnutls/libz"
>> "1.0.0/openssl"
>> "1.0.0/openssl/libz"
>
> Hm, I'm not entirely happy with that: I want to show the libssh2 version
> number when used by an app. I'm not so sure I want that app to show or even
> care about the openssl/libz situation there, even if I can think that in
> other
> situations the app or other users of libssh2 might care. Alas, I'd like to
> get
> the "1.0.0" separately from "openssl/gnutls/libz"...
>
> So what do you think about this:
>
> const char *libssh2_version(int req_version_num, const char **extra);
>
> So if 'extra' isn't NULL, it gets set to a pointer with "openssl/libz" style
> info and the function returns "1.0.1_CVS" ?
>
> It still makes it possible to do things like:
>
> if (!libssh2_version(LIBSSH2_VERSION_NUM, NULL)) {
> fprintf (stderr, "Runtime libssh2 version too old!\n");
> exit(1);
> }
Yup. Or just skip the 'extra' parameter completely. People who care
about that kind of details can run ldd on the application or library,
can't they?
The use-case I see for this function is the snippet above, to catch
runtime-vs-compiletime version mis-matches, and to print the version
number in debug messages.
/Simon
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