Makefile - 移动目标文件

Question

经过一些搜索,我成功地将以下Makefile放在一起:

CC = gcc
CFLAGS = -c -Wall
LDFLAGS = 
SOURCEFILES = main.c
SOURCES = src/$(SOURCEFILES)
OBJECTS = $(SOURCES:.c=.o)
EXECUTABLE = netsim

all: $(SOURCES) $(EXECUTABLE)

$(EXECUTABLE): $(OBJECTS)
    $(CC) $(LDFLAGS) $(OBJECTS) -o $@

.c.o:
    $(CC) $(CFLAGS) $< -o $@

clean:
    rm -rf netsim $(OBJECTS)

我希望能够将我的目标文件移动到另一个目录中,但一直在努力使其工作.我错过了什么？

Answer 1

诀窍是不要移动你的对象.
您应该构建它并在构建它们的地方使用它.

例如,您具有以下目录结构:

$ tree .
??? Makefile
??? include
?   ??? common_head.h
??? obj
??? src
    ??? foo.c
    ??? main.c

手动执行:

$ gcc -o ./obj/foo.o  -c ./src/foo.c  -I ./include  # Build Object #
$ gcc -o ./obj/main.o -c ./src/main.c -I ./include
$ gcc -o exe ./obj/foo.o ./obj/main.o               # Build Executable #

Makefile来模拟上面的内容

C_FLAGS := -g -Wall -Wextra
CC := gcc
RM := rm
LINKFLAGS := -lanylibrary

.PHONY: $(TARGET)
.PHONY: clean

VPATH:= ./src/ ./obj/ ./include/

# Path for .c , .h and .o Files 
SRC_PATH := ./src/
OBJ_PATH := ./obj/
INC_PATH := -I ./include

# Executable Name 
TARGET := exe

# Files to compile
OBJ1 := foo.o \
        main.o

OBJ := $(patsubst %,$(OBJ_PATH)%,$(OBJ1))

# Build .o first
$(OBJ_PATH)%.o: $(SRC_PATH)%.c
                @echo [CC] $<
                @$(CC) $(C_FLAGS) -o $@ -c $< $(INC_PATH)                  

# Build final Binary
$(TARGET):      $(OBJ)
                @echo [INFO] Creating Binary Executable [$(TARGET)]
                @$(CC) -o $@ $^ $(LINKFLAGS)

# Clean all the object files and the binary
clean:   
                @echo "[Cleaning]"
                @$(RM) -rfv $(OBJ_PATH)*
                @$(RM) -rfv $(TARGET)

所以,当你做一个Make

$ make -B
[CC] src/foo.c
[CC] src/main.c
[INFO] Creating Binary Executable [exe]

看干运用 make -n

$ make clean ; make -n
g++ -g -Wall -Wextra -o obj/foo.o  -c src/foo.c  -I ./include
g++ -g -Wall -Wextra -o obj/main.o -c src/main.c -I ./include
g++ -o  exe  obj/foo.o obj/main.o -lanylibrary

因此,在构建目录结构后,应该如下所示.

$ tree .
??? Makefile
??? exe
??? include
?   ??? common_head.h
??? obj
?   ??? foo.o
?   ??? main.o
??? src
    ??? foo.c
    ??? main.c

从我之前的回答.
您不必使用任何PHONY move对象,也不会不必要地重新创建对象.