如何在编译C++代码时解决一些版本控制问题

how do I fix some versioning issue when compiling C++ code?

本文关键字：解决 版本控制 问题 代码 编译 C++      更新时间：2023-10-16

我正试图在Linux上编译位于http://sourceforge.net/projects/desr/files/Release/desr-0.9.tgz/download。

当我跑步的时候/配置，一切顺利，直到我键入make。然后我得到以下错误：

In file included from ./string.h:33,
                 from HtmlTokenizer.cpp:24:
/usr/include/c++/4.4/cstring:76: error: ‘::memchr’ has not been declared
/usr/include/c++/4.4/cstring:77: error: ‘::memcmp’ has not been declared
/usr/include/c++/4.4/cstring:78: error: ‘::memcpy’ has not been declared
/usr/include/c++/4.4/cstring:79: error: ‘::memmove’ has not been declared
/usr/include/c++/4.4/cstring:80: error: ‘::memset’ has not been declared
/usr/include/c++/4.4/cstring:81: error: ‘::strcat’ has not been declared
/usr/include/c++/4.4/cstring:82: error: ‘::strcmp’ has not been declared
/usr/include/c++/4.4/cstring:83: error: ‘::strcoll’ has not been declared
/usr/include/c++/4.4/cstring:84: error: ‘::strcpy’ has not been declared
/usr/include/c++/4.4/cstring:85: error: ‘::strcspn’ has not been declared
/usr/include/c++/4.4/cstring:86: error: ‘::strerror’ has not been declared
/usr/include/c++/4.4/cstring:87: error: ‘::strlen’ has not been declared
/usr/include/c++/4.4/cstring:88: error: ‘::strncat’ has not been declared
/usr/include/c++/4.4/cstring:89: error: ‘::strncmp’ has not been declared
/usr/include/c++/4.4/cstring:90: error: ‘::strncpy’ has not been declared
/usr/include/c++/4.4/cstring:91: error: ‘::strspn’ has not been declared
/usr/include/c++/4.4/cstring:92: error: ‘::strtok’ has not been declared
/usr/include/c++/4.4/cstring:93: error: ‘::strxfrm’ has not been declared
/usr/include/c++/4.4/cstring:94: error: ‘::strchr’ has not been declared
/usr/include/c++/4.4/cstring:95: error: ‘::strpbrk’ has not been declared
/usr/include/c++/4.4/cstring:96: error: ‘::strrchr’ has not been declared
/usr/include/c++/4.4/cstring:97: error: ‘::strstr’ has not been declared

有什么问题吗？

这是g++——版本：

g++ (Ubuntu 4.4.3-4ubuntu5.1) 4.4.3
Copyright (C) 2009 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

当存在时

 #include <cstring>

g++编译器应该将它自己包含的声明放入std:：AND全局名称空间中。出于某种原因，它似乎没有这么做。尝试用std:：strcpy替换strcpy的一个实例。

我也遇到过类似的问题。在我的情况下，头文件包含的顺序如下

#include <string> // for string class
#include <cstring> // for memcpy()

因此，我遇到了您在gcc 4.6.3中提到的上述错误。

切换包含已工作的顺序。。

此问题的一个可能原因是您设法在命名空间块中获得了#include <cstring>。

这将导致为include保护设置#define，阻止您在其他任何地方重新导入它，但同时将所有符号加载到您的命名空间中，而不是加载到它们所属的全局范围中。

当我试图将内联模板定义与它们的声明放在一个单独的文件中时，有时会犯这个错误。

尽管这个问题已经很老了，但我只会添加到@Daniels的答案中。对我来说，这个错误是因为在源文件中，在一个类定义未以;终止的头之后包含了<cstring>。

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