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12 Libtool's trace interface
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This section describes macros whose sole purpose is to be traced using
Autoconf's ‘--trace’ option (*note The Autoconf Manual:
(autoconf)autoconf Invocation.) 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.

 -- Macro: LT_SUPPORTED_TAG (TAG)
     This macro is called once for each language enabled in the package.
     Its only argument, TAG, is the tag-name corresponding to the
     language (*note Tags::).

     You can therefore retrieve the list of all tags enabled in a
     project using the following command:
          autoconf --trace 'LT_SUPPORTED_TAG:$1'