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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 that could compile .foo files to .o files. You would simply define a suffix rule for your language:
.foo.o: foocc -c -o $@ $<
Then you could directly use a .foo file in a
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 out which extensions you are defining your
suffix rule for. This usually happens when your extension 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
For instance, the following definition prevents Automake from misinterpreting the ‘.idlC.cpp:’ rule as an attempt to transform .idlC files into .cpp files.
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.