Makefile：专用文件夹中的多个目标

Question

我正在与 make 语言作斗争，但尚未达到我的目标。 我有以下文件夹结构。

/sources/src => *.c
/sources/inc => *.h
/build => makefile
/build/target1/addsrc => *.c & *.h
/build/target2/addsrc => *.c & *.h

我想使用命令 make 编译两个目标，或者使用命令 make target1 或 make target2 之一单独编译任何目标。每个目标都使用位于sources文件夹中的相同源，添加位于其自己的addsrc文件夹中的其他源，并应用不同的编译标志。 makefile 应该创建以下目录和文件：

/build/target1/objects => *.o
/build/target1 => mylib.so
/build/target2/objects => *.o
/build/target2 => mylib.so

我尝试使用以下 makefile：

targets=target1 target2

TARGET=$(dir $@)

DIR_OBJ     = $(TARGET)objects
DIR_BIN     = $(TARGET)
BIN         = mylib.so

DIR_SRC     = ../sources/src
DIR_ADDSRC_LOC = ./$(TARGET)addsrc
INCLUDES  = -I./$(TARGET)addsrc -I../sources/inc

SRC := $(notdir $(wildcard $(DIR_SRC)/*.c))
ifneq ($(DIR_ADDSRC_LOC),)
  SRCLOC := $(notdir $(wildcard $(DIR_ADDSRC_LOC)/*.c))
endif
SRCS = $(SRC) $(SRCLOC)

OBJ = $(SRCS:%.c=$(DIR_OBJ)/%.o)

CFLAGS  = -fPIC
LFLAGS = -shared -lm -Wl,--start-group -Wl,--no-undefined

all  : $(targets)

$(targets): % : %/init %/$(BIN) 

$(targets:%=%/init):
    @if [ ! -d $(DIR_OBJ) ]; then \mkdir -p $(DIR_OBJ); fi;
    @if [ ! -d $(DIR_BIN) ]; then \mkdir -p $(DIR_BIN); fi;

$(targets:%=%/$(BIN)): $(OBJ)
    gcc $(OBJ) $(LFLAGS) -o $@

$(DIR_OBJ)/%.o: %.c
    gcc $(INCLUDES) $(CFLAGS) -c $< -o $@

这适用于每个目标的目录初始化。然而，其余的绝对行不通。我花了几个小时让它工作但没有成功。任何帮助将不胜感激。谢谢 ！

注意：我还没有研究有关编译标志的目标依赖关系。

Answer 1

既然您有 gnu-make 标签，那么让我们使用 GNU make：

targets  := target1 target2
BIN      := mylib.so
DIR_SRC  := ../sources/src
DIR_INC  := ../sources/inc
SRC      := $(wildcard $(DIR_SRC)/*.c)
OBJ      := $(patsubst $(DIR_SRC)/%.c,%.o,$(SRC))
CFLAGS   := -fPIC -I$(DIR_INC)
LDFLAGS  := -shared -Wl,--start-group -Wl,--no-undefined
LDLIBS   := -lm

.PHONY: all $(targets) clean
all: $(addsuffix /$(BIN),$(targets))

clean:
    rm -rf $(addsuffix /objects,$(targets)) $(addsuffix /$(BIN),$(targets))

$(targets): %: %/$(BIN)

%.o:
    $(CC) $(CFLAGS) -c 
lt; -o $@

$(addsuffix /objects,$(targets)):
    \mkdir -p $@

# $1: target
define target_rule
$1-LSRC := $(wildcard $1/addsrc/*.c)
$1-LOBJ := $(patsubst $1/addsrc/%.c,$1/objects/%.o,$($1-LSRC))
$1-GOBJ := $(addprefix $1/objects/,$(OBJ))
$1-OBJ  := $($1-LOBJ) $($1-GOBJ)

$($(1)-LOBJ): $1/objects/%.o: $1/addsrc/%.c
$($(1)-GOBJ): $1/objects/%.o: $(DIR_SRC)/%.c

$($1-OBJ): CFLAGS += -I./$1/addsrc
$($1-OBJ): | $1/objects

$1/$(BIN): $($1-OBJ)
    $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LDLIBS)
endef
$(foreach t,$(targets),$(eval $(call target_rule,$t)))

这会利用 GNU make 的特定功能，尤其是 foreach-eval-call。它还对目录使用仅订购先决条件 ，以及标准 make 变量 （LDFLAGS、CC、LDLIBS...）而不是您正在使用的那些。

头文件中的依赖关系没有表达，因为您没有解释它们应该是什么。适应。

演示：

$ tree
.
├── build
│   ├── makefile
│   ├── target1
│   │   └── addsrc
│   │       └── c.c
│   └── target2
└── sources
    ├── inc
    │   ├── a.h
    │   └── b.h
    └── src
        ├── a.c
        └── b.c

7 directories, 6 files
$ cd build
$ make
\mkdir -p target1/objects
\mkdir -p target2/objects
cc -fPIC -I../sources/inc -I./target1/addsrc -c target1/addsrc/c.c -o target1/objects/c.o
cc -fPIC -I../sources/inc -I./target1/addsrc -c ../sources/src/a.c -o target1/objects/a.o
cc -fPIC -I../sources/inc -I./target1/addsrc -c ../sources/src/b.c -o target1/objects/b.o
cc -fPIC -I../sources/inc -I./target2/addsrc -c ../sources/src/a.c -o target2/objects/a.o
cc -fPIC -I../sources/inc -I./target2/addsrc -c ../sources/src/b.c -o target2/objects/b.o
cc -fPIC -I../sources/inc -shared -o target1/mylib.so target1/objects/c.o target1/objects/a.o target1/objects/b.o -lm
cc -fPIC -I../sources/inc -shared -o target2/mylib.so target2/objects/a.o target2/objects/b.o -lm
$ make clean
rm -rf target1/objects target2/objects target1/mylib.so target2/mylib.so
$ make target1
\mkdir -p target1/objects
cc -fPIC -I../sources/inc -I./target1/addsrc -c target1/addsrc/c.c -o target1/objects/c.o
cc -fPIC -I../sources/inc -I./target1/addsrc -c ../sources/src/a.c -o target1/objects/a.o
cc -fPIC -I../sources/inc -I./target1/addsrc -c ../sources/src/b.c -o target1/objects/b.o
cc -fPIC -I../sources/inc -shared -o target1/mylib.so target1/objects/c.o target1/objects/a.o target1/objects/b.o -lm
$ make target2
\mkdir -p target2/objects
cc -fPIC -I../sources/inc -I./target2/addsrc -c ../sources/src/a.c -o target2/objects/a.o
cc -fPIC -I../sources/inc -I./target2/addsrc -c ../sources/src/b.c -o target2/objects/b.o
cc -fPIC -I../sources/inc -shared -o target2/mylib.so target2/objects/a.o target2/objects/b.o -lm