3

该线程是对 clang 的 libc++ 调试模式的早期讨论，该调试模式将通过_LIBCPP_DEBUG2在编译器命令中定义来启用。刚刚与错误分配进行了斗争，std::vector<>我有兴趣能够为我的调试版本打开它。

当我尝试简单地添加_LIBCPP_DEBUG=1到预处理器宏构建设置时，我在链接阶段遇到错误（如下所示）。我怀疑这些是由新生成的对讨论线程中描述的调试数据库的引用引起的。

在早期的讨论中，有人说标准版本的库中提供了必要的支持，但今天似乎并非如此。它仍然支持吗？如果是这样，我如何链接到必要的位？

Ld /Users/kaelin/Library/Developer/Xcode/DerivedData/OMWorkspace-bzkzcamyqoztgyalubrmemkzmjvk/Build/Products/Debug/vMAT.dylib normal x86_64
    cd /Users/Shared/Source/vMAT
    setenv MACOSX_DEPLOYMENT_TARGET 10.8
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -dynamiclib -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk -L/Users/kaelin/Library/Developer/Xcode/DerivedData/OMWorkspace-bzkzcamyqoztgyalubrmemkzmjvk/Build/Products/Debug -F/Users/kaelin/Library/Developer/Xcode/DerivedData/OMWorkspace-bzkzcamyqoztgyalubrmemkzmjvk/Build/Products/Debug -F/Users/Shared/Source/vMAT/../../../kaelin/Library/Developer/Xcode/DerivedData/OMWorkspace-bzkzcamyqoztgyalubrmemkzmjvk/Build/Products/Debug -filelist /Users/kaelin/Library/Developer/Xcode/DerivedData/OMWorkspace-bzkzcamyqoztgyalubrmemkzmjvk/Build/Intermediates/vMAT.build/Debug/vMAT.build/Objects-normal/x86_64/vMAT.LinkFileList -install_name "@rpath/vMAT.dylib" -mmacosx-version-min=10.8 -fobjc-arc -fobjc-link-runtime -stdlib=libc++ -framework BlocksKit -framework Accelerate -framework Cocoa -single_module -compatibility_version 1 -current_version 1 -o /Users/kaelin/Library/Developer/Xcode/DerivedData/OMWorkspace-bzkzcamyqoztgyalubrmemkzmjvk/Build/Products/Debug/vMAT.dylib

Undefined symbols for architecture x86_64:
  "std::__1::__libcpp_db::__comparable(void const*, void const*) const", referenced from:
      NSString* (anonymous namespace)::dump<double>(NSString*, double*, int vector[4]) in vMAT_Array+UnaryOps.o
      NSString* (anonymous namespace)::dump<float>(NSString*, float*, int vector[4]) in vMAT_Array+UnaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<double>(double*, int vector[4], double*, int vector[4], double) in vMAT_Array+BinaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<float>(float*, int vector[4], float*, int vector[4], double) in vMAT_Array+BinaryOps.o
  "std::__1::__libcpp_db::__dereferenceable(void const*) const", referenced from:
      NSString* (anonymous namespace)::dump<double>(NSString*, double*, int vector[4]) in vMAT_Array+UnaryOps.o
      NSString* (anonymous namespace)::dump<float>(NSString*, float*, int vector[4]) in vMAT_Array+UnaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<double>(double*, int vector[4], double*, int vector[4], double) in vMAT_Array+BinaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<float>(float*, int vector[4], float*, int vector[4], double) in vMAT_Array+BinaryOps.o
  "std::__1::__libcpp_db::__insert_c(void*)", referenced from:
      std::__1::vector<float, std::__1::allocator<float> >::vector<float*>(float*, float*, std::__1::enable_if<__is_forward_iterator<float*>::value, void>::type*) in vMAT_Array+UnaryOps.o
      std::__1::vector<double, std::__1::allocator<double> >::vector<double*>(double*, double*, std::__1::enable_if<__is_forward_iterator<double*>::value, void>::type*) in vMAT_Array+UnaryOps.o
      std::__1::vector<float, std::__1::allocator<float> >::vector<float*>(float*, float*, std::__1::enable_if<__is_forward_iterator<float*>::value, void>::type*) in vMAT_Array+BinaryOps.o
      std::__1::vector<double, std::__1::allocator<double> >::vector<double*>(double*, double*, std::__1::enable_if<__is_forward_iterator<double*>::value, void>::type*) in vMAT_Array+BinaryOps.o
      std::__1::vector<int, std::__1::allocator<int> >::vector(unsigned long, int const&) in vMAT_inconsistent.o
      std::__1::vector<int, std::__1::allocator<int> >::vector(std::__1::vector<int, std::__1::allocator<int> > const&) in vMAT_inconsistent.o
      (anonymous namespace)::clusterOptions(NSArray*) in vMAT_cluster.o
      ...
  "std::__1::__libcpp_db::__insert_ic(void*, void const*)", referenced from:
      NSString* (anonymous namespace)::dump<double>(NSString*, double*, int vector[4]) in vMAT_Array+UnaryOps.o
      NSString* (anonymous namespace)::dump<float>(NSString*, float*, int vector[4]) in vMAT_Array+UnaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<double>(double*, int vector[4], double*, int vector[4], double) in vMAT_Array+BinaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<float>(float*, int vector[4], float*, int vector[4], double) in vMAT_Array+BinaryOps.o
  "std::__1::__libcpp_db::__erase_c(void*)", referenced from:
      NSString* (anonymous namespace)::dump<double>(NSString*, double*, int vector[4]) in vMAT_Array+UnaryOps.o
      NSString* (anonymous namespace)::dump<float>(NSString*, float*, int vector[4]) in vMAT_Array+UnaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<double>(double*, int vector[4], double*, int vector[4], double) in vMAT_Array+BinaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<float>(float*, int vector[4], float*, int vector[4], double) in vMAT_Array+BinaryOps.o
      (anonymous namespace)::traceTree(vMAT::Matrix<double>, double*, int, unsigned int) in vMAT_inconsistent.o
      ___Block_byref_object_dispose_ in vMAT_inconsistent.o
      (anonymous namespace)::Options::~Options() in vMAT_cluster.o
      ...
  "std::__1::__libcpp_db::__erase_i(void*)", referenced from:
      NSString* (anonymous namespace)::dump<double>(NSString*, double*, int vector[4]) in vMAT_Array+UnaryOps.o
      NSString* (anonymous namespace)::dump<float>(NSString*, float*, int vector[4]) in vMAT_Array+UnaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<double>(double*, int vector[4], double*, int vector[4], double) in vMAT_Array+BinaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<float>(float*, int vector[4], float*, int vector[4], double) in vMAT_Array+BinaryOps.o
  "std::__1::__get_const_db()", referenced from:
      NSString* (anonymous namespace)::dump<double>(NSString*, double*, int vector[4]) in vMAT_Array+UnaryOps.o
      NSString* (anonymous namespace)::dump<float>(NSString*, float*, int vector[4]) in vMAT_Array+UnaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<double>(double*, int vector[4], double*, int vector[4], double) in vMAT_Array+BinaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<float>(float*, int vector[4], float*, int vector[4], double) in vMAT_Array+BinaryOps.o
  "std::__1::__c_node::~__c_node()", referenced from:
      std::__1::_C_node<std::__1::vector<float, std::__1::allocator<float> > >::~_C_node() in vMAT_Array+UnaryOps.o
      std::__1::_C_node<std::__1::vector<double, std::__1::allocator<double> > >::~_C_node() in vMAT_Array+UnaryOps.o
      std::__1::_C_node<std::__1::vector<float, std::__1::allocator<float> > >::~_C_node() in vMAT_Array+BinaryOps.o
      std::__1::_C_node<std::__1::vector<double, std::__1::allocator<double> > >::~_C_node() in vMAT_Array+BinaryOps.o
      std::__1::_C_node<std::__1::vector<int, std::__1::allocator<int> > >::~_C_node() in vMAT_inconsistent.o
      std::__1::_C_node<std::__1::vector<int, std::__1::allocator<int> > >::~_C_node() in vMAT_cluster.o
      std::__1::_C_node<std::__1::vector<double, std::__1::allocator<double> > >::~_C_node() in vMAT_cluster.o
      ...
  "std::__1::__get_db()", referenced from:
      NSString* (anonymous namespace)::dump<double>(NSString*, double*, int vector[4]) in vMAT_Array+UnaryOps.o
      NSString* (anonymous namespace)::dump<float>(NSString*, float*, int vector[4]) in vMAT_Array+UnaryOps.o
      std::__1::vector<float, std::__1::allocator<float> >::vector<float*>(float*, float*, std::__1::enable_if<__is_forward_iterator<float*>::value, void>::type*) in vMAT_Array+UnaryOps.o
      std::__1::vector<double, std::__1::allocator<double> >::vector<double*>(double*, double*, std::__1::enable_if<__is_forward_iterator<double*>::value, void>::type*) in vMAT_Array+UnaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<double>(double*, int vector[4], double*, int vector[4], double) in vMAT_Array+BinaryOps.o
      signed char (anonymous namespace)::isEqualEpsilon<float>(float*, int vector[4], float*, int vector[4], double) in vMAT_Array+BinaryOps.o
      std::__1::vector<float, std::__1::allocator<float> >::vector<float*>(float*, float*, std::__1::enable_if<__is_forward_iterator<float*>::value, void>::type*) in vMAT_Array+BinaryOps.o
      ...
  "typeinfo for std::__1::__c_node", referenced from:
      typeinfo for std::__1::_C_node<std::__1::vector<float, std::__1::allocator<float> > > in vMAT_Array+UnaryOps.o
      typeinfo for std::__1::_C_node<std::__1::vector<double, std::__1::allocator<double> > > in vMAT_Array+UnaryOps.o
      typeinfo for std::__1::_C_node<std::__1::vector<float, std::__1::allocator<float> > > in vMAT_Array+BinaryOps.o
      typeinfo for std::__1::_C_node<std::__1::vector<double, std::__1::allocator<double> > > in vMAT_Array+BinaryOps.o
      typeinfo for std::__1::_C_node<std::__1::vector<int, std::__1::allocator<int> > > in vMAT_inconsistent.o
      typeinfo for std::__1::_C_node<std::__1::vector<int, std::__1::allocator<int> > > in vMAT_cluster.o
      typeinfo for std::__1::_C_node<std::__1::vector<double, std::__1::allocator<double> > > in vMAT_cluster.o
      ...
  "vtable for std::__1::__c_node", referenced from:
      std::__1::_C_node<std::__1::vector<float, std::__1::allocator<float> > >::_C_node(void*, std::__1::__c_node*) in vMAT_Array+UnaryOps.o
      std::__1::_C_node<std::__1::vector<double, std::__1::allocator<double> > >::_C_node(void*, std::__1::__c_node*) in vMAT_Array+UnaryOps.o
      std::__1::_C_node<std::__1::vector<float, std::__1::allocator<float> > >::_C_node(void*, std::__1::__c_node*) in vMAT_Array+BinaryOps.o
      std::__1::_C_node<std::__1::vector<double, std::__1::allocator<double> > >::_C_node(void*, std::__1::__c_node*) in vMAT_Array+BinaryOps.o
      std::__1::_C_node<std::__1::vector<int, std::__1::allocator<int> > >::_C_node(void*, std::__1::__c_node*) in vMAT_inconsistent.o
      std::__1::_C_node<std::__1::vector<int, std::__1::allocator<int> > >::_C_node(void*, std::__1::__c_node*) in vMAT_cluster.o
      std::__1::_C_node<std::__1::vector<double, std::__1::allocator<double> > >::_C_node(void*, std::__1::__c_node*) in vMAT_cluster.o
      ...
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
4

2 回答 2

2

根据这段对话，

谢谢克里斯。我已经检查了这个的实验实现。

-D_LIBCPP_DEBUG2

为您提供“标准”调试模式，其中包括检查迭代器失效。

-D_LIBCPP_DEBUG2=0

让你“调试精简版”。这只检查真正便宜的东西，比如你提到的那些。

我把门开着是为了：

-D_LIBCPP_DEBUG2=2

这将进行更昂贵的检查（例如检查红/黑树的不变量）。但目前还没有这样做。

在这一点上，我仍然只专注于矢量。

霍华德

当我用 Xcode 5.0.x（当前最新版本的 Xcode）尝试这个标志时，_LIBCPP_DEBUG2=1它不起作用，因为它需要链接到 libcpp 的调试支持运行时代码，该代码是专门为调试 libcpp 本身而编写的。但是_LIBCPP_DEBUG2=0在没有链接到调试支持运行时的情况下工作，并且目前为我提供了非常有用的断言，例如调用std::vector<T>::back()空向量。

于 2014-02-18T07:36:14.523 回答
2

只是为了更新这一点：以下似乎有效并且至少可以捕获您想要在 10.9 上捕获的主要错误：

-D_LIBCPP_DEBUG=0

10.9 中的 clang++ 似乎不支持任何高于级别 0 的内容

于 2014-04-11T06:47:09.780 回答