Re: [PATCH 1/3] http: add support for selecting SSL backends at runtime

> This patch adds the Git side of that feature: by setting http.sslBackend
> to "openssl" or "schannel", Git for Windows can now choose the SSL
> backend at runtime.
> [...]
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> ---
> diff --git a/http.c b/http.c
> @@ -995,6 +1003,33 @@ void http_init(struct remote *remote, const char *url, int proactive_auth)
> +#if LIBCURL_VERSION_NUM >= 0x073800
> +       if (http_ssl_backend) {
> +               const curl_ssl_backend **backends;
> +               struct strbuf buf = STRBUF_INIT;
> +               int i;
> +
> +               switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
> +               case CURLSSLSET_UNKNOWN_BACKEND:
> +                       strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
> +                                           "Supported SSL backends:"),
> +                                           http_ssl_backend);
> +                       for (i = 0; backends[i]; i++)
> +                               strbuf_addf(&buf, "\n\t%s", backends[i]->name);
> +                       die("%s", buf.buf);

> +               case CURLSSLSET_NO_BACKENDS:
> +                       die(_("Could not set SSL backend to '%s': "
> +                             "cURL was built without SSL backends"),
> +                           http_ssl_backend);
> +               case CURLSSLSET_TOO_LATE:
> +                       die(_("Could not set SSL backend to '%s': already set"),
> +                           http_ssl_backend);
> +               case CURLSSLSET_OK:
> +                       break; /* Okay! */
> +               }
> +       }
> +#endif