如何编写具有单独源目录和头目录的 Makefile？

Question

按照 本教程…

我有 2 个源文件和 1 个头文件。我想把它们放在单独的目录中，就像教程中一样。

所以我设置了这个项目：

 .
├── include
│   └── hellomake.h
├── Makefile
└── src
    ├── hellofunc.c
    └── hellomake.c

生成文件：

 IDIR =../include
CC=gcc
CFLAGS=-I$(IDIR)

ODIR=obj
LDIR =../lib

_DEPS = hellomake.h
DEPS = $(patsubst %,$(IDIR)/%,$(_DEPS))

_OBJ = hellomake.o hellofunc.o
OBJ = $(patsubst %,$(ODIR)/%,$(_OBJ))

$(ODIR)/%.o: %.c $(DEPS)
    $(CC) -c -o $@ $< $(CFLAGS)

hellomake: $(OBJ)
    gcc -o $@ $^ $(CFLAGS)

.PHONY: clean

clean:
    rm -f $(ODIR)/*.o *~ core $(INCDIR)/*~

我生成的错误说：

 gcc -o hellomake  -I../include
gcc: fatal error: no input files
compilation terminated.
make: *** [hellomake] Error 4

发生了什么？

原文由 iBeyondPower 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

这是我在 Windows 设置中使用的内容：

 CC = g++
CFLAGS   = -Wall -std=c++20

SRCDIR   = src
HEADDIR  = include
OBJDIR   = build
BINDIR   = bin
# where the executable will be stored
EXECUTABLE := $(BINDIR)/main

# list of all source files
SOURCES  := $(wildcard $(SRCDIR)/*.cpp)
# list of all header files
INCLUDES := $(wildcard $(HEADDIR)/*.h)
# from the list of all source files, create a list of all object files
OBJECTS  := $(SOURCES:$(SRCDIR)/%.cpp=$(OBJDIR)/%.o)

# all: clean $(EXECUTABLE)
all: $(EXECUTABLE)

# Link: Generate executable file from object file
$(EXECUTABLE): $(OBJECTS)
    @echo LINKING..... $(CC) -o $@ $(OBJECTS)
    @$(CC) -o $@ $(OBJECTS)
    @echo RUNNING: $(EXECUTABLE)
    @$(EXECUTABLE)
# Compile: Generate object files from source files
# $@ := {EXECUTABLE}
# $< := THE first file
# $^ all the dependency
# C++ Sources
$(OBJDIR)/%.o : $(SRCDIR)/%.cpp | makedirs
    @echo COMPILING... $(CC) $(CFLAGS) -c "$<" -o "$@"
    @$(CC) $(CFLAGS) -c $< -o $@

# `|` is order-only-prerequisites
# https://www.gnu.org/software/make/manual/html_node/Prerequisite-Types.html
makedirs:
# check if the file exists; if not, create it
# mkdir -p $(OBJDIR) in linux
    @if not exist "$(OBJDIR)" mkdir $(OBJDIR)
    @if not exist "$(BINDIR)" mkdir $(BINDIR)

#Delete dependence files, object files, and the EXECUTABLE file
clean:
    @echo CLEANING UP
# check if the directories exist; if so, delete them
    @if exist "$(OBJDIR)" rmdir /s /q $(OBJDIR)
    @if exist "$(BINDIR)" rmdir /s /q $(BINDIR)

原文由 Sharukh Rahman 发布，翻译遵循 CC BY-SA 4.0 许可协议