makefile编译所有文件,而不是最后编辑的文件 [英] makefile compiles all files instead of the last edited ones
问题描述
请注意,SO上也有类似的问题,但是我认为我的情况有所不同,此外,我的Makefile非常简单明了.我是Makefile的新手.
Note that there are similar questions on SO, however I think my situation is different, moreover my Makefile is extremely simple and straight forward. I am new to Makefile.
假设我需要编译一个项目,看起来像这样 --
Suppose I need to compile a project, that looks like this --
.
├── [4.0K] bin
├── [ 517] Makefile
├── [4.0K] obj
└── [4.0K] src
├── [ 117] func1.cpp
├── [ 76] func2.cpp
├── [ 137] global.h
└── [ 97] main1.cpp
我的Makefile看起来像这样-
and my Makefile looks like this --
CC := g++
CFLAGS := -g -Wall -std=c++0x
LDFLAGS := -lm
NAMES := func1.cpp func2.cpp main1.cpp
SRC := $(addprefix src/,$(NAMES))
OBJ := $(addprefix obj/,$(NAMES:.cpp=.o))
DEPS := $(OBJ:.o=.d)
.PHONY: clean all debug
all: prog
debug:
$(info $$SRC: ${SRC})
$(info $$OBJ: ${OBJ})
$(info $$DEPS: ${DEPS})
prog: bin/prog
bin/prog: $(OBJ)
$(CC) $^ -o $@
$(OBJ): $(SRC)
$(CC) $(CFLAGS) -I/src/global.h -c $(addprefix src/,$(notdir $(@:.o=.cpp))) -o $@
-include $(DEPS)
clean:
rm -rf bin/*
rm -rf obj/*
假设我打开了文件 func1.cpp
并进行了一些更改.当我调用 make
时,它会编译所有文件,但是应该只编译一个文件( func1.cpp
).
Suppose I opened a file func1.cpp
and made some changes. When I invoke make
it compiles all files, but it was supposed to compile only one (func1.cpp
).
我该如何解决?
注意:出于其他原因,我需要 prog
, bin/prog
,而且我也无法做类似 obj的食谱/%.o:src/%.c
,因为我的目标可能与相同对象的子集不同.
Note: I need prog
, bin/prog
for a different reason, also I can't do recipes like obj/%.o: src/%.c
because I might have different target from the subset of the same objects.
推荐答案
编写如下规则:
$(OBJ): $(SRC)
cmd
在你的情况下是
obj/func1.o obj/func2.o obj/main.o : src/func1.cpp src/func2.cpp src/main1.cpp
cmd
先决条件不会被压缩.这将为每个目标生成一个规则,具有所有先决条件.那就是:
The prerequisites don't get zipped across. That generates one rule for each target, with all of the prerequisites. That is:
obj/func1.o : src/func1.cpp src/func2.cpp src/main1.cpp
cmd
obj/func2.o : src/func1.cpp src/func2.cpp src/main1.cpp
cmd
obj/main.o : src/func1.cpp src/func2.cpp src/main1.cpp
cmd
由于 src/func1.cpp
是所有目标文件的先决条件,因此它们都将重新编译.
Since src/func1.cpp
is a prereq for all of the object files, they all get recompiled.
您要使用的是静态模式规则:
obj/%.o : src/%.cpp
$(CC) $(CFLAGS) -I/src -c $< -o $@
请注意, -I
用于包含目录,而不包括文件.
Note that -I
is for include directories, not include files.
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