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Hugo Hakim Damer
806861359b
This commit allows using a system-provided version of TinyDTLS when building libcoap. To do so, some potentially backwards-incompatible changes to the way TinyDTLS is handled in the configure-script were made: - The argument `--with-submodule-tinydtls` is added. If it is set to yes, the configure-script will use the TinyDTLS git submodule for DTLS functionality (assuming `--with-tinydtls` is also set). - The configure-script will prefer using the system-provided version of TinyDTLS as long as `--with-submodule-tinydtls` is not explicitly set to yes. - It will however fall back to the vendored version by default if no system-provided version could be found and if `--without-submodule-tinydtls` is not explicitly set. - If a system-provided version of TinyDTLS was found, it will be used automatically if no DTLS backend was selected explicitly (with the lowest priority compared to the other DTLS libraries). However, the submodule will *never* be used automatically, even if `--with-submodule-tinydtls` is set (i.e., to use the submodule, `--with-tinydtls` must be set as well). If TinyDTLS is not installed system-wide (or if the installed version is too old to contain a pkg-config file), the behaviour should be identical to older versions. Otherwise, use the `--with-submodule-tinydtls` option to force usage of the git submodule version if required.