Makefile错误:无规则可作为目标 | 无规则可作为目标

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问题描述

SOURCES = server.c

TARGET = Server

CC = gcc

all: $(SOURCES) $(TARGET)


$(CC) $(SOURCES) -o $(TARGET)

clean:


rm -rf $(TARGET)

上面是我的Web服务器的Makefile.虽然server.c文件位于目录中，但这会产生休闲错误

Above is the Makefile of my web server. Though server.c file is in the directory this gives the fallowing error

make: *** No rule to make target `Server', needed by `all'.  Stop.

我犯了什么错误以及如何解决它.

What is the mistake I've made and how to solve it.

推荐答案

我认为您的makefile在您的机器和帖子之间的某个地方出现了乱码，但是有一个简单的修复方法我认为可以解决:

I think your makefile got garbled somewhere between your machine and the post, but there is a simple fix that I think will work:

all: $(SOURCES)

这(可能)将解决问题并消除错误-如果仅此而已，您可以停止阅读.但是此makefile仍然有问题，因此我们可以进行更多改进.

That will (probably) solve the problem and make the error go away-- if that's all you want then you can stop reading. But there are still things wrong with this makefile, so we can make some more improvements.

首先，进行一些调整，使其与我认为您的makefile真正说的相符:

First, a little adjustment to make it match what I think your makefile really says:

SOURCES = server.c

TARGET = Server

CC = gcc

all: $(SOURCES) $(TARGET)
    $(CC) $(SOURCES) -o $(TARGET)

clean:
    rm -rf $(TARGET)

前三行和clean规则都可以，我们将忽略它们.现在，我们给出TARGET自己的规则并理顺先决条件:

The first three lines and the clean rule are all right, we'll ignore those. Now we give TARGET its own rule and straighten out the prerequisites:

all: $(TARGET)

$(TARGET): $(SOURCES)
    $(CC) $(SOURCES) -o $(TARGET)

现在，我们将all设为PHONY(因为它实际上并没有创建名为"all"的文件)，并引入自动变量以使TARGET规则更健壮和更少冗余:

Now we make all PHONY (since it doesn't really make a file called "all"), and introduce automatic variables to make the TARGET rule more robust and less redundant:

.PHONY: all
all: $(TARGET)

$(TARGET): $(SOURCES)
    $(CC) $< -o $@

如果您的代码库变得更复杂，还有很多东西要学习，但是现在就可以了.

There's more to learn if your codebase gets more complicated, but that'll do for now.

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