I have the following project architecture My aim is to generate a png image for each directory present into doc/uml into build/doc/uml The parent makefile is the following one And the submakefile is the following one However it's failing when I'm launching it with make doc It seems that the problem comes from the fact that '%' can't be replaced

makefile substitute target pattern twice in its dependency

I have the following project architecture

/
├── makefile
└── doc/
    ├── makefile
    └── uml/
        ├── uml1/
        │   ├── uml1.plantuml
        |   └── res/
        |       ├── ressource1
        |       └── ressource2
        └── uml2/
            ├── uml2.plantuml
            └── res/
                ├── ressource1
                └── ressource2

My aim is to generate a png image for each directory present into doc/uml into build/doc/uml

The parent makefile is the following one

BUILD_PATH?=./build

doc:
    ${MAKE} -C $@ $@ ADOC_OUTPUT_DIR=$(abspath ${BUILD_PATH}/doc)

clean:
    rm -rf build

.PHONY: doc clean

And the submakefile is the following one

ADOC_OUTPUT_DIR ?= build
UML_OUTPUT_DIR = ${ADOC_OUTPUT_DIR}/uml

UML = $(notdir $(wildcard uml/*))
UML_TARGETS = $(foreach uml, ${UML}, ${UML_OUTPUT_DIR}/${uml}.png)

doc: uml

uml: ${UML_OUTPUT_DIR} ${UML_TARGETS}

${UML_TARGETS}: ${UML_OUTPUT_DIR}/%.png : uml/%/%.plantuml
    plantuml $< -o $(@D)

###################################
##### Directory creation part #####
###################################

${UML_OUTPUT_DIR}:
    mkdir -p $@

.PHONY: doc uml ${UML_TARGETS} ${UML_OUTPUT_DIR}

However it’s failing when I’m launching it with make doc

$ make doc
make -C doc doc ADOC_OUTPUT_DIR=/home/julien/test_uml/build/doc
make[1] : Entering directory « /home/julien/test_uml/doc »
make[1]: ***  No rule to make target « uml/gui_state_diagram/%.plantuml », needed by « /home/julien/test_uml/build/doc/uml/gui_state_diagram.png ». Stop.
make[1] : Exiting directory « /home/julien/test_uml/doc »
makefile:12 : the recipe for target « doc » failed
make: *** [doc] Erreur 2

It seems that the problem comes from the fact that ‘%’ can’t be replaced twice on the dependency.

I can’t find a way to achieve my goal without modifying the project architecture (I would like to keep it as close as it is now)

Is there a way to replace the pattern ‘%’ twice ?

Is there a better way to achieve my goal than trying to replace the uml name twice in the target’s dependency ?

Answer

You can also use secondary expansion:

.SECONDEXPANSION:
${UML_TARGETS}: ${UML_OUTPUT_DIR}/%.png : uml/$$*/$$*.plantuml
        plantuml $< -o $(@D)

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Answer