在VS2010中编译旧的C ++代码时，cmath编译错误 [英] cmath compilation error when compiling old C++ code in VS2010

问题描述

我已经继承了几个C ++文件和一个随附的makefile，我试图把它作为VS2010的解决方案。我创建了一个空项目，并为其中一个makefile目标添加了适当的C ++和头文件（.hpp）。

I've inherited a few C++ files and an accompanying makefile, which I'm trying to bring into VS2010 as a solution. I've created an empty project and added the appropriate C++ and header (.hpp) files for one of the makefile targets.

然而，当我尝试编译项目时，我立即得到大量的C2061（语法错误标识符）错误来自cmath关于acosf，asinf，atanf等。

When I try to compile the project, however, I immediately get a large number of C2061 (syntax error identifier) errors coming from cmath regarding acosf, asinf, atanf, etc.

cmath中的错误行：

The error line in cmath:

#pragma once
#ifndef _CMATH_
#define _CMATH_
#include <yvals.h>

#ifdef _STD_USING
   #undef _STD_USING
     #include <math.h>
   #define _STD_USING

#else /* _STD_USING */
   #include <math.h>
#endif /* _STD_USING */

#if _GLOBAL_USING && !defined(RC_INVOKED)

_STD_BEGIN
using _CSTD acosf; using _CSTD asinf;

相关C ++文件的顶部块（虽然命名为.C）：

The top block of the relevant C++ file (though named as a .C):

#include <fstream>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

using namespace std;

后跟main（）函数，它不直接调用任何trig函数。
这是一个很明显的东西，但我错过了。任何人都可以帮助？

Followed by the main() function, which doesn't call any of the trig functions directly. This has to be something really obvious, but I'm missing it. Can anyone help?

谢谢！

推荐答案

编译为C ++？大多数编译器将.C文件编译为C，将.cpp文件编译为C ++，用C编译器编译C ++文件可能会失败。

Are you sure it's compiling as C++? Most compilers will compile .C file as C and .cpp files as C++, compiling a C++ file with a C-compiler will probably fail.

（'c'）headers和newstyle（'c ++'）headers。它应该更像这样（我怀疑是错误，然而）。

Also, that code mixes oldstyle ('c') headers and newstyle ('c++') headers. It should be more like this (I doubt that is the error however).

#include <fstream>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>

using namespace std;

这是我能看到你所提供的。但大多数时候，当你在C / C ++本身的库文件中得到错误，它仍然是你的代码在某个地方错了，像忘记;在头文件中的类语句之后。

That's all I can see with what you've given. But most of the time when you get errors in library files of C/C++ itself, it still is code of you that's wrong somewhere, like forgetting the ; after a class statement in a header file.

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