Question

使用cmake和Visual Studio 14 2015从官方源文件构建LLVM时出现多个错误，并且无法弄清楚为什么会出现这种错误，这些错误产生的原因是什么？

d：\ LLVM \构建\ LLVM \包括\ LLVM /支持/ AlignOf.h（57）：错误C2988：无法识别的模板声明/定义 [d：\ LLVM \构建\构建\ lib中\ SYSTEM \ LLVMSystem.vcxproj] d：\ LLVM \建立\ LLVM \包括\ LLVM /支持/ AlignOf.h（57）：错误C2059：语法错误：＆＃39; alignof＆＃39; [d：\ LLVM \构建\构建\ lib中\ SYSTEM \ LLVMSystem.vcxproj] d：\ LLVM \建立\ LLVM \包括\ LLVM /支持/ AlignOf.h（59）：错误C2143：语法错误：缺少＆＃39 ;;＆＃39;之前＆＃39;}＆＃39; [d：\ LLVM \构建\构建\ lib中\ 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alignof和alignOf的差异。

这为我解决了这个问题： http://llvm.org/viewvc/llvm-project?view=revision&revision=117774

构建LLVM时，AlignOf.h中出现错误

1 个答案: