C ++ 11 constexpr导致编译器内部错误（C1001） [英] C++11 constexpr causes compiler's internal error (C1001)

问题描述

我正在使用Visual Studio 2015 Update 3。

I am using Visual Studio 2015 Update 3.

我遇到致命错误：

（代码C1001）：编译器发生内部错误。

(code C1001) : An internal error has occurred in the compiler.

以下是代码：

template<typename T>
constexpr T epsilon = std::numeric_limits<T>::epsilon();

我阅读了它在Visual Studio Update 2中已修复的问题。有人可以解释一下为什么我会收到此错误？

I read it was fixed in Visual Studio Update 2. Can someone explain me why I am getting this error? Thanks in advance.

推荐答案

任何内部错误（ICE）都是编译器错误。之所以得到它，是因为您碰巧触发了该错误。对于此编译器，您可以在Microsoft Connect上对其进行报告。

Any internal error (ICE) is a compiler bug. You get it because you have happened to trigger that bug. For this compiler you can report it at Microsoft Connect.

对于此类报告，您需要一个示例，该示例具有预期的正确结果和错误的结果。

For such a report you need an example with an expected correct result, and the erroneous result.

以下测试程序进行编译和处理；在MinGW g ++ 5.1上可以很好地运行

The following test program compiles & runs nicely with MinGW g++ 5.1

#include <limits>

template<typename T>
constexpr T epsilon = std::numeric_limits<T>::epsilon();

#include <iostream>
using namespace std;
auto main() -> int
{
    cout << epsilon<double> << endl;
}

输出：

2.22045e-016

使用Visual C ++ 2015 update 2会生成ICE：

With Visual C++ 2015 update 2 it produces an ICE:

foo.cpp(10): fatal error C1001: An internal error has occurred in the compiler.
(compiler file 'f:\dd\vctools\compiler\cxxfe\sl\p1\c\symbols.c', line 28114)
 To work around this problem, try simplifying or changing the program near the locations listed above.
Please choose the Technical Support command on the Visual C++
 Help menu, or open the Technical Support help file for more information
foo.cpp(10): note: see reference to variable template 'const double epsilon' being compiled

编译器版本：

> cl /nologo- 2>&1 | find "++"
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23725 for x86

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