make,gnu-make , Match-Anything Pattern Rules


Match-Anything Pattern Rules

Question:

Tag: make,gnu-make

I am using GNU Make 3.81 version.

From the following example, I expect match anything pattern(%:) has to be print. Instead of that te%: has executed.

Can some one explain, why target '%:' did not run?

Is this not match all file name?

Makefile:

all: test
    echo [email protected]
%: 
    echo 1: [email protected]
te%:
    echo 2: [email protected]

Output:

echo 2: test
2: test
echo all
all

Answer:

There are special rules for how make treats match-anything pattern rules; see the documentation. You are creating a "non-terminal match-anything rule" here, and the rule for that is this:

A non-terminal match-anything rule cannot apply to a file name that indicates a specific type of data. A file name indicates a specific type of data if some non-match-anything implicit rule target matches it.

In your case you have a non-match-anything implicit rule target (te%) which matches the file name (test) and so a non-terminal match-anything rule (%:) cannot match it.


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