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This section describes macros whose sole purpose is to be traced using Autoconf’s --trace option (see The Autoconf Manual in The Autoconf Manual) to query the Libtool configuration of a project. These macros are called by Libtool internals and should never be called by user code; they should only be traced.
This macro is called once for each language enabled in the package. Its only argument, tag, is the tag-name corresponding to the language (see Tags).
You can therefore retrieve the list of all tags enabled in a project using the following command:
autoconf --trace 'LT_SUPPORTED_TAG:$1'