UBUNTU 配置OBJECT-C环境

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原文链接：http://www.cnblogs.com/kloongin/archive/2013/06/06/3121486.html

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#运维

本文详细介绍了在Ubuntu环境下搭建Objective-C开发环境的过程，并针对遇到的两个典型错误进行了深入分析和解决方案说明。

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Ubuntu下Object-c的开发环境搭建:
1.安装gnustep和gobjc

sudo apt-get install gobjc gnustep gnustep-devel

2.Hello World

#import <Foundation/Foundation.h>

int main(char argc, char* argv[]) {
    NSLog(@"hello world");
    return 0;
}

错误1：

$ gcc `gnustep-config --objc-flags` hello.m -o hello
hello.m:3:5: warning: first argument of ‘main’ should be ‘int’ [-Wmain]
/tmp/ccx3pWOU.o: In function `main':
/home/tercel/workspace/objectc/hello.m:4: undefined reference to `NSLog'
/tmp/ccx3pWOU.o: In function `__objc_gnu_init':
/home/tercel/workspace/objectc/hello.m:6: undefined reference to `__objc_exec_class'
/tmp/ccx3pWOU.o:(.data.rel+0x0): undefined reference to `__objc_class_name_NSConstantString'
collect2: ld returned 1 exit status
tercel@tercel-pc:~/workspace/objectc$ gcc `gnustep-config --objc-flags` -lgnustep-base hello.m -o hello
hello.m:3:5: warning: first argument of ‘main’ should be ‘int’ [-Wmain]
/tmp/ccAOmFM3.o: In function `main':
/home/tercel/workspace/objectc/hello.m:4: undefined reference to `NSLog'
/tmp/ccAOmFM3.o: In function `__objc_gnu_init':
/home/tercel/workspace/objectc/hello.m:6: undefined reference to `__objc_exec_class'
/tmp/ccAOmFM3.o:(.data.rel+0x0): undefined reference to `__objc_class_name_NSConstantString'
collect2: ld returned 1 exit status

错误2：

$ gcc `gnustep-config --objc-flags` -lgnustep-base hello.m -o hello
hello.m:3:5: warning: first argument of ‘main’ should be ‘int’ [-Wmain]
/tmp/ccAOmFM3.o: In function `main':
/home/tercel/workspace/objectc/hello.m:4: undefined reference to `NSLog'
/tmp/ccAOmFM3.o: In function `__objc_gnu_init':
/home/tercel/workspace/objectc/hello.m:6: undefined reference to `__objc_exec_class'
/tmp/ccAOmFM3.o:(.data.rel+0x0): undefined reference to `__objc_class_name_NSConstantString'
collect2: ld returned 1 exit status

成功：

$ gcc `gnustep-config --objc-flags` hello.m -o hello -lgnustep-base
$ ./hello
2013-01-24 15:25:12.748 hello[15962] hello world
$

注意：错误2 几乎和成功一样，就是 -l位置不一样，原因何在？

转载于:https://www.cnblogs.com/kloongin/archive/2013/06/06/3121486.html