CODEWITHSUNDEEP
gccmakefile
RPFeltz
RPFeltz

Reputation: 1075

Makefile generic rule not working

I tried to make a generic makefile where you supply the names of the source files and some directories, but I can't get the generic rule for the object files to work.

My makefile is like this:

SOURCE_NAMES=main
EXECUTABLE_NAME=Program

EXECUTABLE_DIR=./dist
EXECUTABLE_EXT=
SOURCE_DIR=./src
SOURCE_EXT=.cc
OBJECT_DIR=./build
OBJECT_EXT=.obj

COMPILER=gcc
COMPILER_FLAGS=-c -Wall -std=gnu++11
LINKER_FLAGS=

SOURCES=$(addsuffix $(SOURCE_EXT),$(addprefix $(SOURCE_DIR)/,$(SOURCE_NAMES)))
OBJECTS=$(addsuffix $(OBJECT_EXT),$(addprefix $(OBJECT_DIR)/,$(SOURCE_NAMES)))
EXECUTABLE=$(EXECUTABLE_DIR)/$(EXECUTABLE_NAME)$(EXECUTABLE_EXT)

all: $(EXECUTABLE) 

$(EXECUTABLE): $(OBJECTS) 
    $(COMPILER) $(LINKER_FLAGS) $(OBJECTS) -o $@

%$(OBJECT_EXT): %$(SOURCE_EXT)
    $(COMPILER) $(COMPILER_FLAGS) $< -o $@

However, the final rule, %$(OBJECT_EXT): %$(SOURCE_EXT), does not seem to be working correctly, judging from the error I get:

make: *** Er is geen regel om doel 'build/main.obj' te maken, nodig voor 'dist/RandomGenerator'. Gestopt.

which translates to:

make: *** There is no rule to make target 'build/main.obj', required for 'dist/RandomGenerator'. Stopped.

When I write the rule explicitly, it does work:

./build/main.obj: ./src/main.cc
    $(COMPILER) $(COMPILER_FLAGS) $< -o $@

But I would rather not explicitly do that for every source file.

How do I fix this?

Edit:

Just for clarity, this question is about why the generic rule at the end of my makefile isn't working. I would expect ./build/main.obj to match %$(OBJECT_EXT) or %.obj, but that doesn't seem to be the case and I don't understand why it doesn't work.

Upvotes: 0

Views: 521

Answers (1)

DevSolar
DevSolar

Reputation: 70372

Try adding ./build and ./src to your rule (which are contained in your "explicit" rule but absent from the variables you use in your Makefile).

Upvotes: 1

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