1

I've been trying for some time to separate the source files of my project from the generated object files.

Indeed, I would like my project to be structured this way:

obj/
    main.o
    src1.o
    [...]
src/
    main.c
    src1.c
    [...]
Makefile

The Makefile I currently have is as follows:

NAME                =       a.out

OBJ_DIR             =       "obj"
SRC_DIR             =       "src"

MAIN_SRC            =       main.c

PROJ_SRC            =       src1.c      \
                            src2.c      \
                            src3.c

MAIN_OBJ            =       $(MAIN_SRC:%.c=%.o)

PROJ_OBJ            =       $(PROJ_SRC:%.c=%.o)

CC                  =       gcc
RM                  =       rm -rf

$(NAME):            $(MAIN_OBJ) $(PROJ_OBJ)
                    $(CC) $(MAIN_OBJ) $(PROJ_OBJ) -o $(NAME)

all:                $(NAME)

clean:
                    $(RM) $(MAIN_OBJ) $(PROJ_OBJ)

fclean:             clean
                    $(RM) $(NAME)

I tried to use pattern rules, without success.

MAIN_OBJ            =       $(MAIN_SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)

PROJ_OBJ            =       $(PROJ_SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)

[...]

$(OBJ_DIR)/%.o:     $(SRC_DIR)/%.c
                    $(CC) $(CFLAGS) -c $< -o $@

Does anyone have a solution to my problem?

4

2 回答 2

1

MAIN_SRC并且PROJ_OBJ没有目录前缀，所以表达式

$(MAIN_SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)
$(PROJ_SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)

不要更换任何东西。

使固定：

MAIN_OBJ := $(MAIN_SRC:%.c=$(OBJ_DIR)/%.o)
PROJ_OBJ := $(PROJ_SRC:%.c=$(OBJ_DIR)/%.o)

然后你的模式规则应该起作用。

您可能希望为您make创建$(OBJ_DIR)：

$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIR)
    $(CC) $(CFLAGS) -c -o $@ $<

$(OBJ_DIR) :
    mkdir -p $@

为您提供更高级的示例，自动生成头文件依赖项。

于 2020-02-04T13:25:26.800 回答
0

兄弟！

如果你的项目 " main" 的架构就是这样：

main

|

|__Makefile

|__obj

|__src

     |__main.c
 
     |__src1.c

     |__src2.c

     [...]

只需将其添加到您的“ Makefile”中即可将您的对象存储在源文件目录之外：

# Object files
# String substituion for every C/C++ file
# e.g: ./src/src1.cpp turns into ./obj/src1.o
OBJS := $(patsubst %.c, ${OBJ_DIR}/%.o, $(notdir $(SRC_DIR)))

只需将其添加到您的“ Makefile”中即可编译：

# Compile: Generate object files from source files
# $@ := {NAME}
# $< := THE first file
# $^ all the dependency
# C Sources
$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c
    $(CC) $(C_FLAGS) -c $< -o $@

结尾！

于 2022-01-29T13:24:07.273 回答