How to write different implicit rules for different file names for GNU Make

Posted by anupamsr on Stack Overflow See other posts from Stack Overflow or by anupamsr
Published on 2010-06-15T11:00:40Z Indexed on 2010/06/15 11:02 UTC
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Hi!

I have a directory in which I keep adding different C++ source files, and generic Makefile to compile them. This is the content of the Makefile:

.PHONY: all clean

CXXFLAGS = -pipe -Wall -Wextra -Weffc++ -pedantic -ggdb

SRCS = $(wildcard *.cxx)
OBJS = $(patsubst %.cxx,%.out,$(SRCS))

all: $(OBJS)

clean:
    rm -fv $(OBJS)

%.out: %.cxx
    $(CXX) $(CXXFLAGS) $^ -o $@

NOTE: As is obvious from above, I am using *.out for executable file extensions (and not for object file).

Also, there are some files which are compiled together:

g++ file_main.cxx file.cxx -o file_main.out

To compile such files, until now I have been adding explicit rules in the Makefile:

file_main.out: file_main.cxx file.cxx

file.out: file_main.out
    @echo "Skipping $@"

But now my Makefile has a lot of explicit rules, and I would like to replace them with a simpler implicit rule.

Any idea how to do it?

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