使用 Eclipse 和 minGW 的多个“无法解决”问题

Question

我最近安装了（最新版本的）“面向 C/C++ 开发人员的 Eclipse IDE”和 minGW (4.8.1)，以帮助我在很久以后重新使用 C++。

我已将-std=c++11 添加到Other flags C/C++ Build/Settings/Tool Settings/GCC C++ Compiler/Miscellaneous

我有一个小程序利用了许多 C++11 功能（例如，使用 chrono 库、.emplace_back）。

运行后，我在“问题”窗口中遇到多个未解决的问题，如下所示）。

有趣的是，该程序确实可以编译并运行。

1. 有了这个，我没有在 Eclipse 中设置什么来解决这些问题吗？

2. 有谁知道 minGW (4.8.1) 中的 to_string() 函数是否仍然存在问题，例如以下不编译：

   window.setTitle("Bullets on screen: " + to_string(bullets.size()) + " currentSlice: " + to_string(currentSlice) + " FT: " + to_string(ft) + " FPS: " + to_string(fps) );
   

   它确实使用 Visual Studio Express 2013 进行编译（尽管 chrono 库的准确性存在问题，因此切换到 minGW）。

   谢谢。

Eclipse“问题”窗口输出：

Description Resource Path Location Type
 Symbol 'duration' could not be resolved chronotest.cpp /chronotest/src line 19 Semantic Error
 Function 'now' could not be resolved Test2.cpp /Test2/src line 143 Semantic Error
 Function 'duration_cast' could not be resolved Test2.cpp /Test2/src line 160 Semantic Error
 Function 'now' could not be resolved Test2.cpp /Test2/src line 158 Semantic Error
 Symbol 'chrono' could not be resolved Test2.cpp /Test2/src line 8 Semantic Error
 Type 'std::centi' could not be resolved chronotest.cpp /chronotest/src line 20 Semantic Error
 Type 'std::chrono::seconds' could not be resolved chronotest.cpp /chronotest/src line 24 Semantic Error
 Type 'std::time_t' could not be resolved chronotest.cpp /chronotest/src line 48 Semantic Error
 Symbol 'duration' could not be resolved chronotest.cpp /chronotest/src line 47 Semantic Error
 Function 'now' could not be resolved chronotest.cpp /chronotest/src line 44 Semantic Error
 Function 'now' could not be resolved chronotest.cpp /chronotest/src line 39 Semantic Error
 Type 'std::chrono::system_clock' could not be resolved chronotest.cpp /chronotest/src line 38 Semantic Error
 Function 'end' could not be resolved Test2.cpp /Test2/src line 214 Semantic Error
 Symbol 'time_point' could not be resolved chronotest.cpp /chronotest/src line 38 Semantic Error
 Function 'end' could not be resolved Test2.cpp /Test2/src line 212 Semantic Error
 Type 'milli' could not be resolved Test2.cpp /Test2/src line 161 Semantic Error
 Method 'count' could not be resolved Test2.cpp /Test2/src line 161 Semantic Error
 Symbol 'duration_cast' could not be resolved Test2.cpp /Test2/src line 160 Semantic Error
 Symbol 'duration' could not be resolved Test2.cpp /Test2/src line 161 Semantic Error
 Method 'count' could not be resolved chronotest.cpp /chronotest/src line 51 Semantic Error
 Symbol 'duration_cast' could not be resolved chronotest.cpp /chronotest/src line 30 Semantic Error
 Method 'count' could not be resolved chronotest.cpp /chronotest/src line 30 Semantic Error
 Function 'to_time_t' could not be resolved chronotest.cpp /chronotest/src line 48 Semantic Error
 Method 'count' could not be resolved chronotest.cpp /chronotest/src line 32 Semantic Error
 Function 'ctime' could not be resolved chronotest.cpp /chronotest/src line 50 Semantic Error
 Method 'count' could not be resolved chronotest.cpp /chronotest/src line 33 Semantic Error
 Symbol 'duration' could not be resolved chronotest.cpp /chronotest/src line 22 Semantic Error
 Invalid arguments '
 Candidates are:
 __gnu_cxx::__normal_iterator<Bullet *,std::vector<Bullet,std::allocator<Bullet>>> erase(__gnu_cxx::__normal_iterator<Bullet *,std::vector<Bullet,std::allocator<Bullet>>>)
 __gnu_cxx::__normal_iterator<Bullet *,std::vector<Bullet,std::allocator<Bullet>>> erase(__gnu_cxx::__normal_iterator<Bullet *,std::vector<Bullet,std::allocator<Bullet>>>, __gnu_cxx::__normal_iterator<Bullet *,std::vector<Bullet,std::allocator<Bullet>>>)
 ' Test2.cpp /Test2/src line 212 Semantic Error
 Symbol 'ratio' could not be resolved chronotest.cpp /chronotest/src line 22 Semantic Error
 Invalid arguments '
 Candidates are:
 #0 remove_if(#0, #0, #1)
 ' Test2.cpp /Test2/src line 212 Semantic Error
 Symbol 'duration_cast' could not be resolved chronotest.cpp /chronotest/src line 28 Semantic Error
 Method 'count' could not be resolved chronotest.cpp /chronotest/src line 28 Semantic Error
 Method 'emplace_back' could not be resolved Test2.cpp /Test2/src line 191 Semantic Error
 Symbol 'ratio' could not be resolved chronotest.cpp /chronotest/src line 19 Semantic Error
 Symbol 'duration' could not be resolved chronotest.cpp /chronotest/src line 20 Semantic Error
 Symbol 'duration' could not be resolved chronotest.cpp /chronotest/src line 21 Semantic Error
 Function 'begin' could not be resolved Test2.cpp /Test2/src line 212 Semantic Error
 Symbol 'ratio' could not be resolved chronotest.cpp /chronotest/src line 21 Semantic Error

---

[编辑]：很抱歉没有包含剩余“to_string”的错误详细信息。 Eclipse 的“问题”窗口输出如下：

    Description Resource    Path    Location    Type
'to_string' was not declared in this scope  Test2.cpp   /Test2/src  line 170    C/C++ Problem
Function 'to_string' could not be resolved  Test2.cpp   /Test2/src  line 170    Semantic Error
Function 'to_string' could not be resolved  Test2.cpp   /Test2/src  line 170    Semantic Error
unused variable 'currentSlice' [-Wunused-variable]  Test2.cpp   /Test2/src  line 125    C/C++ Problem
Function 'to_string' could not be resolved  Test2.cpp   /Test2/src  line 170    Semantic Error
Invalid arguments '
Candidates are:
void setTitle(const sf::String &)
'   Test2.cpp   /Test2/src  line 170    Semantic Error
Function 'to_string' could not be resolved  Test2.cpp   /Test2/src  line 170    Semantic Error

Answer 1

转到Project -> Properties -> C/C++ General -> Preprocessor Include Paths, Macros, etc. -> Providers -> CDT GCC built-in compiler settings，停用Use global provider shared between projects 并添加命令行参数-std=c++11。

eclipse 实时代码分析不与构建编译器共享相同的设置。您还可以在 Window -> Preferences -> C/C++ -> Build -> Settings -> CDT GCC Built-in Compiler Settings 中全局更改设置（不仅仅是项目）。

编辑：您需要#include <string> 才能使用std::to_string。

Answer 2

我正在为@Nabla 和@Enissey 给出的答案添加一些细节。

在添加命令行参数时，例如CDT GCC Built-in Compiler Settings Cygwin in Global preferences，

${COMMAND} ${FLAGS} -E -P -v -dD "${INPUTS}"

这样做，

${COMMAND} ${FLAGS} -E -P -v -dD -std=c++11 "${INPUTS}"

到rebuild the index，右键单击您的项目，进入索引子菜单，然后选择“重建”。

就我而言，我在全局范围内进行了更改并重建了索引。

Answer 3

从以下位置重新下载gcc编译器：

http://www.equation.com/servlet/equation.cmd?fa=fortran

将它安装在c:\minGW 文件夹中使用新的工作空间/新的eclipse设置，它就像一个魅力！

在尝试之前不要忘记重新启动，重新构建和设置等。

以及将MinGW 设置为默认工具链窗口-> 首选项-> 新C++ .. -> 将MinMG 设置为首选工具链。

如果您在列表中看不到它，请在创建项目时取消选择“显示项目类型....”。