what's the DRY version of the following Makefile targets?

Posted by carneades on Stack Overflow See other posts from Stack Overflow or by carneades
Published on 2010-04-03T20:22:33Z Indexed on 2010/04/03 20:33 UTC
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I don't know how to execute a command stored as a variable or how to use ifeq inside of a target, so I have a very redundant Makefile at the moment!

Ideally I'd like to have just one target (all) which would run the stored command on Mac and run it twice on Linux, once with -m32 and once with -m64.

all:
    echo PLEASE SELECT OS, e.g. make linux
    exit 1

mac:
     gcc $(SHARED_OPT) $(GENERAL_CFLAGS) $(PLATFORM_CFLAGS) -o $(BUILD_DIR)$(BUILD_NAME) $(SOURCE) $(LIBRARIES)

linux:
    gcc $(SHARED_OPT) $(GENERAL_CFLAGS) $(PLATFORM_CFLAGS) -o $(BUILD_DIR)$(BUILD_NAME64) $(SOURCE) $(LIBRARIES64) -m64
    gcc $(SHARED_OPT) $(GENERAL_CFLAGS) $(PLATFORM_CFLAGS) -o $(BUILD_DIR)$(BUILD_NAME) $(SOURCE) $(LIBRARIES) -m32

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