(automake.info.gz) Suffixes

 
 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.
 
    For instance, suppose you had a compiler which could compile `.foo'
 files to `.o' files.  You would simply define an suffix rule for your
 language:
 
      .foo.o:
              foocc -c -o $@ $<
 
    Then you could directly use a `.foo' file in a `_SOURCES' variable
 and expect the correct results:
 
      bin_PROGRAMS = doit
      doit_SOURCES = doit.foo
 
    This was the simpler and more common case.  In other cases, you will
 have to help Automake to figure which extensions you are defining your
 suffix rule for.  This usually happens when your extensions does not
 start with a dot.  Then, all you have to do is to put a list of new
 suffixes in the `SUFFIXES' variable *before* you define your implicit
 rule.
 
    For instance the following definition prevents Automake to
 misinterpret `.idlC.cpp:' as an attemp to transform `.idlC' into `.cpp'.
 
      SUFFIXES = .idl C.cpp
      .idlC.cpp:
              # whatever
 
    As you may have noted, the `SUFFIXES' variable behaves like the
 `.SUFFIXES' special target of `make'.  You should not touch `.SUFFIXES'
 yourself, but use `SUFFIXES' instead and let Automake generate the
 suffix list for `.SUFFIXES'.  Any given `SUFFIXES' go at the start of
 the generated suffixes list, followed by Automake generated suffixes
 not already in the list.

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