为什么 Makefile 会返回一堆未找到的命令？

Question

我正在尝试学习惰性 foo 制作 sdl2 教程。一切都很好，然后突然我打开 vscode 看到 sdl.h 包含下的红色曲线，现在项目甚至无法编译。有什么想法吗？

生成文件

#OBJS specifies which files to compile as part of the project
OBJS = 01_hello_SDL.cpp

#CC specifies which compiler we're using
CC = g++

#INCLUDE_PATHS specifies the additional include paths we'll need
INCLUDE_PATHS = -IC:\libs\sdl_32\include\SDL2

#LIBRARY_PATHS specifies the additional library paths we'll need
LIBRARY_PATHS = -LC:\libs\sdl_32\lib

#COMPILER_FLAGS specifies the additional compilation options we're using
# -w suppresses all warnings
# -Wl,-subsystem,windows gets rid of the console window
COMPILER_FLAGS = -w -Wl,-subsystem,windows

#LINKER_FLAGS specifies the libraries we're linking against
LINKER_FLAGS = -lmingw32 -lSDL2main -lSDL2

#OBJ_NAME specifies the name of our exectuable
OBJ_NAME = project

#This is the target that compiles our executable
all : $(OBJS)
    $(CC) $(OBJS) $(INCLUDE_PATHS) $(LIBRARY_PATHS) $(COMPILER_FLAGS) $(LINKER_FLAGS) -o $(OBJ_NAME)

终端输出

$ ./Makefile
./Makefile: line 2: OBJS: command not found
./Makefile: line 5: CC: command not found
./Makefile: line 8: INCLUDE_PATHS: command not found
./Makefile: line 11: LIBRARY_PATHS: command not found
./Makefile: line 16: COMPILER_FLAGS: command not found
./Makefile: line 19: LINKER_FLAGS: command not found
./Makefile: line 22: OBJ_NAME: command not found
./Makefile: line 25: OBJS: command not found
./Makefile: line 25: all: command not found
./Makefile: line 26: CC: command not found
./Makefile: line 26: OBJS: command not found
./Makefile: line 26: INCLUDE_PATHS: command not found
./Makefile: line 26: LIBRARY_PATHS: command not found
./Makefile: line 26: COMPILER_FLAGS: command not found
./Makefile: line 26: LINKER_FLAGS: command not found
./Makefile: line 26: OBJ_NAME: command not found
./Makefile: line 26: -o: command not found

Answer 1

Makefile 是一个文件，当您在类似 Unix 的 shell（如 MSYS2）中运行 make 时使用该文件；如果您使用的是 Windows shell（命令提示符、Power Shell），则为mingw32-make。

如果您在#include <SDL.h> 上遇到编译器错误，那么您应该检查SDL.h 是否存在于使用-I 标志指定给编译器的任何路径中。

同样，如果您收到有关 -lSDL2 找不到库的错误，您应该检查 libSDL2.a（或共享库的 libSDL2.dll.a）是否存在于使用 -L 标志指定的任何路径中链接器。

要查看make 执行的实际命令，您可以运行make V=1 以打开详细模式。 （mingw32-make 也是如此）