CODEWITHSUNDEEP
design-patternsmakefiledirectoryrule
Michael Benguigui
Michael Benguigui

Reputation: 63

Makefile, pattern rule with sub directory only work with the first dependence

here is my problem

SOURCES_FUNCTIONS=cJSON.c parallelisationUtilities.c
$(BUILD_DIR)/%.o : $(SOURCE_DIR)/%.c    
    $(CC) $(CFLAGS) -c $< -o $@ $(IFLAGS)

make: *** Aucune règle pour fabriquer la cible « parallelisationUtilities.o », nécessaire pour « build/mainFunction ». Arrêt

By placing parallelisationUtilities.c before cJSON.c in SOURCES_FUNCTIONS, i get the same error with cJSON.o. Fore sure, there are no missing files..

++ Michael

Upvotes: 0

Views: 533

Answers (2)

Michael Benguigui
Michael Benguigui

Reputation: 63

$(BUILD_DIR)/$(EXEC_MAINFUNCTION): $(patsubst %.o,$(BUILD_DIR)/%.o,$(OBJECTS_FUNCTIONS)) $(patsubst %.o,$(BUILD_DIR)/%.o,$(OBJECTS_FUNCTIONS_NOT_TO_CLEAN)) $(patsubst %.o,$(BUILD_DIR)/%.o,$(OBJECT_MAINFUNCTION))
    $(CC) $^ -o $@ $(LDFLAGS)

$(BUILD_DIR)/%.o : $(SOURCE_DIR)/%.c
    $(CC) $(CFLAGS) -c $< -o $@ $(IFLAGS)

Thanks a lot Mad!

Upvotes: 0

MadScientist
MadScientist

Reputation: 100781

You didn't show enough of the makefile: you left out the most critical part which is what target is listing the object files as prerequisites.

I'll bet you have something like this:

xxxx: $(BUILD_DIR)/$(SOURCES_FUNCTIONS:.c=.o)

That's wrong, because it only adds $(BUILD_DIR) to the first file. The expansion of $(SOURCES_FUNCTIONS:.c=.o) gives:

xxxx: $(BUILD_DIR)/cJSON.o parallelisationUtilities.o

You need to use something like this:

xxxx: $(patsubst %.c,$(BUILD_DIR)/%.o,$(SOURCES_FUNCTIONS))

so that the BUILD_DIR prefixes all the files.

Upvotes: 1

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