GCJ throws error: "Undefined reference to main" when compiling

Question

我想编译一个简单的 Java "Hello World" 程序，就像它在 GeeksforGeeks Hello World Tutorial 上所描述的那样，方法是在 Linux 中使用 gcj Ubuntu。这是源代码：

class HelloWorld 
{ 
    public static void main(String args[]) 
    { 
        System.out.println("Hello, World"); 
    } 
}

但是 gcj 抛出了两个错误：

(.text+0x18)：对 main
collect2：错误：ld 返回 1 退出状态

终端的原始输出：

gcj -o helloworld HelloWorld.java
/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: error: ld returned 1 exit status

我会注意这个要求，.java 文件应该以包含 main:

的 class 命名

Important Points :

The name of the class defined by the program is HelloWorld, which is same as name of file(HelloWorld.java). This is not a coincidence. In Java, all codes must reside inside a class and there is at most one public class which contain main() method.

By convention, the name of the main class(class which contain main method) should match the name of the file that holds the program.

我做错了什么？

Answer 1

您缺少 --main= 选项，来自 documentation，链接时使用此选项指定 class 的名称，其主要方法应该当生成的可执行文件为运行.

时被调用

gcj -o helloworld --main=HelloWorld HelloWorld.java

GCJ throws error: "Undefined reference to main" when compiling

GCJ throws error: "Undefined reference to main" when compiling

java

linux

gcc

compiler-errors

gcj