settings: clarify what each value means
Most importantly, clarify what it means for HTTPS and SSH to be supported.
diff --git a/include/git2/common.h b/include/git2/common.h
index a8d698f..99c9981 100644
--- a/include/git2/common.h
+++ b/include/git2/common.h
@@ -109,9 +109,27 @@
* was compiled
*/
typedef enum {
+ /**
+ * If set, libgit2 was built thread-aware and can be safely used from multiple
+ * threads.
+ */
GIT_FEATURE_THREADS = (1 << 0),
+ /**
+ * If set, libgit2 was built with and linked against a TLS implementation.
+ * Custom TLS streams may still be added by the user to support HTTPS
+ * regardless of this.
+ */
GIT_FEATURE_HTTPS = (1 << 1),
+ /**
+ * If set, libgit2 was built with and linked against libssh2. A custom
+ * transport may still be added by the user to support libssh2 regardless of
+ * this.
+ */
GIT_FEATURE_SSH = (1 << 2),
+ /**
+ * If set, libgit2 was built with support for sub-second resolution in file
+ * modification times.
+ */
GIT_FEATURE_NSEC = (1 << 3),
} git_feature_t;
