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Miscellaneous Rules

There are a few rules and variables that didn't fit anywhere else.

Interfacing to etags

automake will generate rules to generate `TAGS' files for use with GNU Emacs under some circumstances.

If any C source code or headers are present, then tags and TAGS targets will be generated for the directory.

At the topmost directory of a multi-directory package, a tags target file will be generated which, when run, will generate a `TAGS' file that includes by reference all `TAGS' files from subdirectories.

Also, if the variable ETAGS_ARGS is defined, a tags target will be generated. This variable is intended for use in directories which contain taggable source that etags does not understand.

Here is how Automake generates tags for its source, and for nodes in its Texinfo file:

ETAGS_ARGS = automake.in --lang=none \
 --regex='/^@node[ \t]+\([^,]+\)/\1/' automake.texi

If you add filenames to `ETAGS_ARGS', you will probably also want to set `TAGS_DEPENDENCIES'. The contents of this variable are added directly to the dependencies for the tags target.

Automake will also generate an ID target which will run mkid on the source. This is only supported on a directory-by-directory basis.

Handling new file extensions

It is sometimes useful to introduce a new implicit rule to handle a file type that Automake does not know about. If this is done, you must notify GNU Make of the new suffixes. This can be done by putting a list of new suffixes in the SUFFIXES variable.

For instance, currently automake does not provide any Java support. If you wrote a macro to generate `.class' files from `.java' source files, you would also need to add these suffixes to the list:

SUFFIXES = .java .class

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