CODEWITHSUNDEEP
c++makefile
Maria Ines Parnisari
Maria Ines Parnisari

Reputation: 17486

Makefile error: No such file or directory

I've got this directory structure:

This is my current Makefile:

CFLAGS = -Wall -pedantic -g
CC = g++
EXEC = flrfile
SRC_DIR = src
BIN_DIR = bin
SOURCES := $(wildcard $(SRC_DIR)/*.cpp)
OBJ := $(patsubst $(SRC_DIR)/%,%,$(SOURCES))
OBJ := $(patsubst %.cpp,%.o,$(OBJ))
OBJ := $(addprefix ../$(BIN_DIR)/,$(OBJ))

all: flrfile

../$(BIN_DIR)/%.o: $(SRC_DIR)/%.cpp $(SRC_DIR)/%.h
    $(CC) $(CFLAGS) -c $(SRC_DIR)/%.cpp -o $@

$(EXEC): $(OBJ)
    @mkdir -p $(BIN_DIR)
    $(CC) $(CFLAGS) $(BIN_DIR)/$(OBJ) -o $(BIN_DIR)/$(EXEC)

.PHONY : clean

clean:
    -rm -rf $(BIN_DIR)

When I run make I get this error:

g++ -Wall -pedantic -g -c src/%.cpp -o ../bin/FixedLengthFieldsRecord.o
g++: error: src/%.cpp: No such file or directory
g++: fatal error: no input files
compilation terminated.
make: *** [../bin/FixedLengthFieldsRecord.o] Error 4

Why is this? I have little to no understanding of Makefile to be honest...

Upvotes: 0

Views: 7712

Answers (1)

kebs
kebs

Reputation: 6707

The correct line for compiling should look like this:

$(BIN_DIR)/%.o: $(SRC_DIR)/%.cpp $(SRC_DIR)/%.h
    $(CXX) -o $@ -c $< $(CFLAGS)

Which means: "for every file matching the pattern "%.o" in $(BIN_DIR), compile it using the associated $(SRC_DIR)/%.cpp as argument (first dependency)

Additional comment: I suspect some missing dependencies: usually, a .c or cpp source file doesn't only depend on the corresponding header file, but might also include other headers from the project.

Upvotes: 2

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