文件math.h编译错误：预期前声明说明符或'...''（' [英] math.h compilation error: expected declaration specifiers or '...' before '('

问题描述

我试图编译一个相当大的项目。一对夫妇的文件包括math.h中我得到的编译错误是：

I'm trying to compile a fairly large project. A couple files include math.h. The compilation error I'm getting is:

"In file included from math.h:71:0,

mathcalls.h:310:1: error: expected declaration specifiers or '...' before '(' token"

我知道我的数学头没有被改变，他们包括罚款与一个Hello数学世界的节目我只是写了，所以我不知道是什么问题。在被给予错误的mathcalls.h文件中特定行

I know my math headers have not been changed and they include fine with a "hello math world" program I just wrote, so I'm not sure what the problem is. THe specific line in the mathcalls.h file that is giving the error is

/* Round X to nearest integral value, rounding halfway cases away from
   zero.  */
__MATHCALLX (round,, (_Mdouble_ __x), (__const__));

任何线索的问题是什么吗？

Any clue what the problem is here?

推荐答案

您定义的圆形包括前＆LT;文件math.h＆GT; 。事情是这样的：

You defined round before including <math.h>. Something like this:

#define round(x) trunc((x+0.5))
#include <math.h>

编译高于code。与GCC-4.6.2打印以下错误：

Compiling the above code with gcc-4.6.2 prints the following error:

In file included from /usr/include/math.h:71:0,
                 from a.c:2:
/usr/include/bits/mathcalls.h:310:1: error: expected declaration specifiers or '...' before '(' token

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