[英]GNU make not detecting if files are changed on windows
I'm a noob with make in general so apologies in advance. 我是个菜鸟,因此通常会提前道歉。
I have a folder structure, where foo.cpp is in the root of the project and all other .cpp files are in one and all headers in another folder. 我有一个文件夹结构,其中foo.cpp位于项目的根目录中,所有其他.cpp文件位于一个文件夹中,所有标头位于另一个文件夹中。 Whenever I change something make just says that everything is up to date.
每当我更改某些内容时,只需说所有内容都是最新的即可。
Working on windows 10. 在Windows上工作10。
The code is from 该代码来自
my makefile: 我的makefile文件:
OBJS = foo.o bar.o
CC = g++
INCLUDE_PATHS = -IC:\Mingw_libs\include\SDL2
LIBRARY_PATHS = -LC:\Mingw_libs\lib -Iheaders
COMPILER_FLAGS = -std=c++11
LINKER_FLAGS = -lmingw32 -lSDL2main -lSDL2 -lSDL2_image
OUTPUTFILE = main
all: $(OBJS)
$(CC) $(OBJS) $(INCLUDE_PATHS) $(LIBRARY_PATHS) $(LINKER_FLAGS) -o $(OUTPUTFILE)
clean:
rm *.o
rm *.exe
foo.o:
$(CC) -c foo.cpp $(INCLUDE_PATHS) $(COMPILER_FLAGS) $(LIBRARY_PATHS) $(LINKER_FLAGS)
bar.o:
$(CC) -c sources/bar.cpp $(INCLUDE_PATHS) $(COMPILER_FLAGS) $(LIBRARY_PATHS) $(LINKER_FLAGS)
You should declare target dependencies like that: 您应该像这样声明目标依赖关系:
foo.obj: foo.c
....
Otherwise make will not now wich files to check for changes. 否则,make现在不会将文件夹在中间以检查更改。
Your makefile has no dependencies for foo.o
or bar.o
. 您的makefile不具有
foo.o
或bar.o
依赖项。
This 这个
all: $(OBJS)
$(CC) $(OBJS) $(INCLUDE_PATHS) $(LIBRARY_PATHS) $(LINKER_FLAGS) -o $(OUTPUTFILE)
says all
depends on $(OBJS)
. 说
all
取决于$(OBJS)
。 So when one of the files in $(OBJS)
changes, that step is run. 因此,当
$(OBJS)
中的文件之一更改时,将运行该步骤。
This says foo.o
depends on nothing: 这说
foo.o
无关紧要:
foo.o:
$(CC) -c foo.cpp $(INCLUDE_PATHS) $(COMPILER_FLAGS) $(LIBRARY_PATHS) $(LINKER_FLAGS)
You need to add the dependency: 您需要添加依赖项:
foo.o: foo.cpp
$(CC) -c foo.cpp $(INCLUDE_PATHS) $(COMPILER_FLAGS) $(LIBRARY_PATHS) $(LINKER_FLAGS)
Note that the spaces after the :
usually need to be a tab, not actual space(s). 请注意
:
之后的空格通常必须是制表符,而不是实际空格。
You need to add dependencies to your target. 您需要向目标添加依赖项。 Make has the syntax
Make具有语法
target : prerequisite
command
So in your case: 因此,在您的情况下:
foo.o: foo.cpp
$(CC) -c $< $(INCLUDE_PATHS) $(COMPILER_FLAGS) $(LIBRARY_PATHS) $(LINKER_FLAGS)
same with bar
与
bar
the $<
is a placeholder for the first prerequisite. $<
是第一个前提条件的占位符。 So you don't have to type foo.cpp
twice. 因此,您不必两次键入
foo.cpp
。
You can checkout more automatic variables here: https://www.gnu.org/software/make/manual/make.html#Automatic-Variables 您可以在此处检出更多自动变量: https : //www.gnu.org/software/make/manual/make.html#Automatic-Variables
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