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if-statementmakefile
FrankieTheKneeMan
FrankieTheKneeMan

Reputation: 6810

Makefile Conditionals erroneous equality

So, I'm kind of new to makefiles, but I have this rule in mine:

$(rc)/%.class: $(r)/%.java
    echo $(strip $(findstring $*,"Robot RoboController"))
ifneq (,$(strip $(findstring $*,"Robot RoboController")))
    echo "Robot or RoboController"
else
    echo "other";
endif

My goal, is that if the matched text is Robot or RoboController, then it compiles in one way, otherwise, it compiles in a different way, unforunately, when I run makes I get the following output:

$ make Classes/RobotSuite/robot/Robot.class
    echo Robot
    Robot
    echo "other";   
    other
$ make Classes/RobotSuite/robot/RoboComm.class
    echo 

    echo "other";   
    other

It seems like no matter what I put into the ifneq, it will erroneously evaluate it as equal to the null string. Can anyone explain why?

I am using the GNU Make v3.81, built for i686-pc-linux-gnu.

Upvotes: 0

Views: 217

Answers (1)

Brian Cain
Brian Cain

Reputation: 14619

If you're using GNU Make, don't use ifneq to solve this problem, use Target specific variable values.

Upvotes: 1

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