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这是一个说明问题的小型纯 C 程序。该程序不做任何事情；它是一个大型程序的精简版本，它表现出同样的问题。

这是场景：

Mac OS X 狮子；

gcc 版本 i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1（基于 Apple Inc. build 5658）（LLVM build 2335.15.00）；

示例代码：

#include <stdlib.h>
#include <stdio.h>

char huge *pbA;
char huge *pbB;

int main(int argc,char *argv[])
{
    pbA = (char huge *)farmalloc(2);
    pbB = pbA;
    *(pbB++) = 'A';
    return( 0 );
}

编译命令：

gcc -c -Wall -O -g -pipe  -D_SDL myTest.c

错误消息：

myTest.c:4: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
myTest.c:5: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
myTest.c: In function ‘main’:
myTest.c:10: error: ‘pbA’ undeclared (first use in this function)
myTest.c:10: error: (Each undeclared identifier is reported only once
myTest.c:10: error: for each function it appears in.)
myTest.c:10: error: expected ‘)’ before ‘huge’
myTest.c:10: warning: implicit declaration of function ‘farmalloc’
myTest.c:11: error: ‘pbB’ undeclared (first use in this function)

那么，我错过了什么？

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1 回答 1

3

我不确定是什么/在哪里huge，但编译器无法在您提供的内容中找到它（即您可能缺少标题）。至于farmalloc，那看起来是在<alloc.h>。现在关于使用这些，在另一个网站上有一个答案huge：

Keywords like near/far/huge were once used as memory models in the old MSDOS 
days when computers had a max of 640K memory.

Any machine built in the last 15 years does not have that restriction so 
unless you have a real issue where you have to use really obsolete hardware, 
I would not spend time with segmented memory model syntax.

huge，并且可能farmalloc也被今天的标准所弃用（就像远与近指针一样）。使用justchar *并且malloc应该是你所需要的；没有奇怪的旧标题。

于 2012-07-24T00:03:35.037 回答