构建LLVM时，AlignOf.h中出现了错误

Question

我在使用cmake和Visual 14 2015从官方源文件构建LLVM时得到了多个错误，并且不知道为什么会发生这些错误，这些错误产生的原因是什么？

D:\LLVM\build\llvm\include\llvm/Support/AlignOf.h(57)：error C2988:无法识别的模板声明/定义D:\LLVM\build\build\lib\System\LLVMSystem.vcxproj D:\LLVM\build\llvm\include\llvm/Support/AlignOf.h(57)：错误C2059:语法错误：“D:\LLVM\build\build\lib\System\LLVMSystem.vcxproj D:\LLVM\build\llvm\include\llvm/Support/AlignOf.h(59)：错误C2143:语法错误:缺失”；‘在'}’D:\LLVM\build\build\lib\System\LLVMSystem.vcxproj

这是AlignOf.h文件中的代码：

#ifndef LLVM_SUPPORT_ALIGNOF_H
#define LLVM_SUPPORT_ALIGNOF_H

namespace llvm {

template <typename T>
struct AlignmentCalcImpl {
  char x;
  T t;
private:
  AlignmentCalcImpl() {} // Never instantiate.
};

/// AlignOf - A templated class that contains an enum value representing
///  the alignment of the template argument.  For example,
///  AlignOf<int>::Alignment represents the alignment of type "int".  The
///  alignment calculated is the minimum alignment, and not necessarily
///  the "desired" alignment returned by GCC's __alignof__ (for example).  Note
///  that because the alignment is an enum value, it can be used as a
///  compile-time constant (e.g., for template instantiation).
template <typename T>
struct AlignOf {
  enum { Alignment =
         static_cast<unsigned int>(sizeof(AlignmentCalcImpl<T>) - sizeof(T)) };

  enum { Alignment_GreaterEqual_2Bytes = Alignment >= 2 ? 1 : 0 };
  enum { Alignment_GreaterEqual_4Bytes = Alignment >= 4 ? 1 : 0 };
  enum { Alignment_GreaterEqual_8Bytes = Alignment >= 8 ? 1 : 0 };
  enum { Alignment_GreaterEqual_16Bytes = Alignment >= 16 ? 1 : 0 };

  enum { Alignment_LessEqual_2Bytes = Alignment <= 2 ? 1 : 0 };
  enum { Alignment_LessEqual_4Bytes = Alignment <= 4 ? 1 : 0 };
  enum { Alignment_LessEqual_8Bytes = Alignment <= 8 ? 1 : 0 };
  enum { Alignment_LessEqual_16Bytes = Alignment <= 16 ? 1 : 0 };

};

/// alignof - A templated function that returns the mininum alignment of
///  of a type.  This provides no extra functionality beyond the AlignOf
///  class besides some cosmetic cleanliness.  Example usage:
///  alignof<int>() returns the alignment of an int.
template <typename T>
static inline unsigned alignof() { return AlignOf<T>::Alignment; }

} // end namespace llvm
#endif 

Answer 1

我认为这主要是由于头文件中的对齐和alignof不一致所致。

这解决了我的问题：http://llvm.org/viewvc/llvm-project?view=revision&revision=117774