Question

我正在尝试按照教程here开发一个“Hello，World”LLVM传递 - 我正在使用该教程here链接的指南来实现LLVM源目录。但是，当我尝试遵循本教程时，CMake会报告LLVM本身内部的一些错误。

我有以下目录结构：

HelloWorld/ CMakeLists.txt HelloWorld/ CMakeLists.txt HelloWorld.cpp

我的HelloWorld.cpp和两个CMakeLists.txt直接从上面链接的教程中复制和粘贴。

我运行CMake HelloWorld并成功生成CMake配置。但是，当我运行make时。我从LLVM代码库本身报告了大量错误。

[ 50%] Building CXX object CMakeFiles/LLVMPassName.dir/Vectorize.cpp.o
In file included from /Volumes/andromeda/HelloWorld/HelloWorld.cpp:1:
In file included from /usr/local/Cellar/llvm/3.6.2/include/llvm/Pass.h:377:
In file included from /usr/local/Cellar/llvm/3.6.2/include/llvm/PassSupport.h:27:
In file included from /usr/local/Cellar/llvm/3.6.2/include/llvm/PassRegistry.h:20:
In file included from /usr/local/Cellar/llvm/3.6.2/include/llvm-c/Core.h:18:
In file included from /usr/local/Cellar/llvm/3.6.2/include/llvm-c/Support.h:17:
/usr/local/Cellar/llvm/3.6.2/include/llvm/Support/DataTypes.h:57:3: error: "Must #define
      __STDC_LIMIT_MACROS before #including Support/DataTypes.h"
# error "Must #define __STDC_LIMIT_MACROS before #including Support/DataTypes.h"
  ^
/usr/local/Cellar/llvm/3.6.2/include/llvm/Support/DataTypes.h:61:3: error: "Must #define
      __STDC_CONSTANT_MACROS before "         "#including Support/DataTypes.h"
# error "Must #define __STDC_CONSTANT_MACROS before " \

列表一直在继续，所有这些都引用LLVM头文件中的错误。这是使用Homebrew彻底安装LLVM。为了使链接工作，我必须将CPLUS_INCLUDE_PATH设置为LLVM的Homebrew包含目录。

我的第一个想法是CMake尝试使用不同的编译器（Clang vs. GCC，反之亦然），但将CMAKE_CXX_COMPILER设置为指向我的clang或g++安装没有帮助。

有没有人对这里可能存在的问题有任何想法？

在评论中跟随@oak提供的链接之后，我能够摆脱前两个Support / DataType错误。但是，许多错误仍然存在。

In file included from /usr/local/Cellar/llvm/3.6.2/include/llvm/Pass.h:377:
In file included from /usr/local/Cellar/llvm/3.6.2/include/llvm/PassSupport.h:27:
In file included from /usr/local/Cellar/llvm/3.6.2/include/llvm/PassRegistry.h:21:
/usr/local/Cellar/llvm/3.6.2/include/llvm/ADT/DenseMap.h:543:63: error: a space is required
      between consecutive right angle brackets (use '> >')
          typename BucketT = detail::DenseMapPair<KeyT, ValueT>>
                                                              ^
/usr/local/Cellar/llvm/3.6.2/include/llvm/ADT/DenseMap.h:694:63: error: a space is required
      between consecutive right angle brackets (use '> >')
          typename BucketT = detail::DenseMapPair<KeyT, ValueT>>

Answer 1

因此，经过大量研究后发现，LLVM和CMake如何支持源外构建存在不一致。 LLVM二进制文件使用-fno-rtti构建，因此CMake会抱怨缺少符号，除非在编译LLVM传递时它也使用SET(CMAKE_CXX_FLAGS "-Wall -fno-rtti")。

通过将{{1}}添加到最里面目录中的CMakeLists.txt文件，我修复了所有麻烦（包括Oak提出的临时修复解决的问题）。

这也受到了StackOverflow上的question的启发。

使用CMake跟随Pass教程时出现内部LLVM语法错误

1 个答案: