代码之家 › 专栏 › 技术社区 › Lu4

无法使用snappy支持编译leveldb

snappy leveldb cmake c++

Lu4 · 技术社区 · 6 年前

我正在努力建造 https://github.com/google/leveldb 支持 https://github.com/google/snappy 在mac os x high sierra上进行压缩,以便以后在XCode项目中使用,我正在浏览自述文件中描述的两个项目的标准编译过程。这包括通过 cmake 对于这两个项目。如果 snappy 项目流程顺畅,所有构建和安装都完美无缺。但是,如果 leveldb ,我做不到 cmake公司 发现 精炼的 我以前通过安装的库 make install 。我不知道如何调试 cmake公司 并找到它寻找图书馆的地方。

非常感谢您的帮助。

以下是两个构建的结果:

编辑

这是一个输出,似乎列表中有/usr/local/lib

另一个编辑

我试过跑步 cc -DCHECK_FUNCTION_EXISTS=snappy_compress -Wl,-search_paths_first -Wl,-headerpad_max_install_names -o check_snappy_exist CheckFunctionExists.c -lsnappy 根据提供的解决方案 sel-fish 。但如果出现以下输出失败:

Undefined symbols for architecture x86_64:
  "std::__1::__vector_base_common<true>::__throw_length_error() const", referenced from:
      void std::__1::vector<snappy::SnappySinkAllocator::Datablock, std::__1::allocator<snappy::SnappySinkAllocator::Datablock> >::__push_back_slow_path<snappy::SnappySinkAllocator::Datablock const>(snappy::SnappySinkAllocator::Datablock const&) in libsnappy.a(snappy.cc.o)
      void std::__1::vector<char*, std::__1::allocator<char*> >::__push_back_slow_path<char* const>(char* const&) in libsnappy.a(snappy.cc.o)
  "std::logic_error::logic_error(char const*)", referenced from:
      void std::__1::vector<snappy::SnappySinkAllocator::Datablock, std::__1::allocator<snappy::SnappySinkAllocator::Datablock> >::__push_back_slow_path<snappy::SnappySinkAllocator::Datablock const>(snappy::SnappySinkAllocator::Datablock const&) in libsnappy.a(snappy.cc.o)
      void std::__1::vector<char*, std::__1::allocator<char*> >::__push_back_slow_path<char* const>(char* const&) in libsnappy.a(snappy.cc.o)
  "std::length_error::~length_error()", referenced from:
      void std::__1::vector<snappy::SnappySinkAllocator::Datablock, std::__1::allocator<snappy::SnappySinkAllocator::Datablock> >::__push_back_slow_path<snappy::SnappySinkAllocator::Datablock const>(snappy::SnappySinkAllocator::Datablock const&) in libsnappy.a(snappy.cc.o)
      void std::__1::vector<char*, std::__1::allocator<char*> >::__push_back_slow_path<char* const>(char* const&) in libsnappy.a(snappy.cc.o)
  "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::resize(unsigned long, char)", referenced from:
      snappy::Uncompress(char const*, unsigned long, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*) in libsnappy.a(snappy.cc.o)
      snappy::Compress(char const*, unsigned long, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*) in libsnappy.a(snappy.cc.o)
  "std::terminate()", referenced from:
      ___clang_call_terminate in libsnappy.a(snappy.cc.o)
  "typeinfo for std::length_error", referenced from:
      void std::__1::vector<snappy::SnappySinkAllocator::Datablock, std::__1::allocator<snappy::SnappySinkAllocator::Datablock> >::__push_back_slow_path<snappy::SnappySinkAllocator::Datablock const>(snappy::SnappySinkAllocator::Datablock const&) in libsnappy.a(snappy.cc.o)
      void std::__1::vector<char*, std::__1::allocator<char*> >::__push_back_slow_path<char* const>(char* const&) in libsnappy.a(snappy.cc.o)
  "vtable for __cxxabiv1::__class_type_info", referenced from:
      typeinfo for snappy::Sink in libsnappy.a(snappy-sinksource.cc.o)
      typeinfo for snappy::Source in libsnappy.a(snappy-sinksource.cc.o)
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
  "vtable for __cxxabiv1::__si_class_type_info", referenced from:
      typeinfo for snappy::ByteArraySource in libsnappy.a(snappy-sinksource.cc.o)
      typeinfo for snappy::UncheckedByteArraySink in libsnappy.a(snappy-sinksource.cc.o)
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
  "vtable for std::length_error", referenced from:
      void std::__1::vector<snappy::SnappySinkAllocator::Datablock, std::__1::allocator<snappy::SnappySinkAllocator::Datablock> >::__push_back_slow_path<snappy::SnappySinkAllocator::Datablock const>(snappy::SnappySinkAllocator::Datablock const&) in libsnappy.a(snappy.cc.o)
      void std::__1::vector<char*, std::__1::allocator<char*> >::__push_back_slow_path<char* const>(char* const&) in libsnappy.a(snappy.cc.o)
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
  "operator delete[](void*)", referenced from:
      snappy::Compress(snappy::Source*, snappy::Sink*) in libsnappy.a(snappy.cc.o)
      snappy::SnappySinkAllocator::Deleter(void*, char const*, unsigned long) in libsnappy.a(snappy.cc.o)
  "operator delete(void*)", referenced from:
      snappy::UncompressAsMuchAsPossible(snappy::Source*, snappy::Sink*) in libsnappy.a(snappy.cc.o)
      snappy::Uncompress(snappy::Source*, snappy::Sink*) in libsnappy.a(snappy.cc.o)
      void std::__1::vector<snappy::SnappySinkAllocator::Datablock, std::__1::allocator<snappy::SnappySinkAllocator::Datablock> >::__push_back_slow_path<snappy::SnappySinkAllocator::Datablock const>(snappy::SnappySinkAllocator::Datablock const&) in libsnappy.a(snappy.cc.o)
      void std::__1::vector<char*, std::__1::allocator<char*> >::__push_back_slow_path<char* const>(char* const&) in libsnappy.a(snappy.cc.o)
      snappy::ByteArraySource::~ByteArraySource() in libsnappy.a(snappy-sinksource.cc.o)
      snappy::UncheckedByteArraySink::~UncheckedByteArraySink() in libsnappy.a(snappy-sinksource.cc.o)
  "operator new[](unsigned long)", referenced from:
      snappy::internal::WorkingMemory::GetHashTable(unsigned long, int*) in libsnappy.a(snappy.cc.o)
      snappy::Compress(snappy::Source*, snappy::Sink*) in libsnappy.a(snappy.cc.o)
      snappy::SnappyScatteredWriter<snappy::SnappySinkAllocator>::SlowAppend(char const*, unsigned long) in libsnappy.a(snappy.cc.o)
  "operator new(unsigned long)", referenced from:
      void std::__1::vector<snappy::SnappySinkAllocator::Datablock, std::__1::allocator<snappy::SnappySinkAllocator::Datablock> >::__push_back_slow_path<snappy::SnappySinkAllocator::Datablock const>(snappy::SnappySinkAllocator::Datablock const&) in libsnappy.a(snappy.cc.o)
      void std::__1::vector<char*, std::__1::allocator<char*> >::__push_back_slow_path<char* const>(char* const&) in libsnappy.a(snappy.cc.o)
  "___cxa_allocate_exception", referenced from:
      void std::__1::vector<snappy::SnappySinkAllocator::Datablock, std::__1::allocator<snappy::SnappySinkAllocator::Datablock> >::__push_back_slow_path<snappy::SnappySinkAllocator::Datablock const>(snappy::SnappySinkAllocator::Datablock const&) in libsnappy.a(snappy.cc.o)
      void std::__1::vector<char*, std::__1::allocator<char*> >::__push_back_slow_path<char* const>(char* const&) in libsnappy.a(snappy.cc.o)
  "___cxa_begin_catch", referenced from:
      ___clang_call_terminate in libsnappy.a(snappy.cc.o)
  "___cxa_free_exception", referenced from:
      void std::__1::vector<snappy::SnappySinkAllocator::Datablock, std::__1::allocator<snappy::SnappySinkAllocator::Datablock> >::__push_back_slow_path<snappy::SnappySinkAllocator::Datablock const>(snappy::SnappySinkAllocator::Datablock const&) in libsnappy.a(snappy.cc.o)
      void std::__1::vector<char*, std::__1::allocator<char*> >::__push_back_slow_path<char* const>(char* const&) in libsnappy.a(snappy.cc.o)
  "___cxa_pure_virtual", referenced from:
      vtable for snappy::Sink in libsnappy.a(snappy-sinksource.cc.o)
      vtable for snappy::Source in libsnappy.a(snappy-sinksource.cc.o)
  "___cxa_throw", referenced from:
      void std::__1::vector<snappy::SnappySinkAllocator::Datablock, std::__1::allocator<snappy::SnappySinkAllocator::Datablock> >::__push_back_slow_path<snappy::SnappySinkAllocator::Datablock const>(snappy::SnappySinkAllocator::Datablock const&) in libsnappy.a(snappy.cc.o)
      void std::__1::vector<char*, std::__1::allocator<char*> >::__push_back_slow_path<char* const>(char* const&) in libsnappy.a(snappy.cc.o)
  "___gxx_personality_v0", referenced from:
      snappy::GetUncompressedLength(snappy::Source*, unsigned int*) in libsnappy.a(snappy.cc.o)
      snappy::Compress(snappy::Source*, snappy::Sink*) in libsnappy.a(snappy.cc.o)
      snappy::RawUncompressToIOVec(char const*, unsigned long, iovec const*, unsigned long) in libsnappy.a(snappy.cc.o)
      snappy::RawUncompressToIOVec(snappy::Source*, iovec const*, unsigned long) in libsnappy.a(snappy.cc.o)
      snappy::RawUncompress(char const*, unsigned long, char*) in libsnappy.a(snappy.cc.o)
      snappy::RawUncompress(snappy::Source*, char*) in libsnappy.a(snappy.cc.o)
      snappy::Uncompress(char const*, unsigned long, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*) in libsnappy.a(snappy.cc.o)
      ...
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

2 回复 | 直到 6 年前

sel-fish 6 年前

似乎您的链接器找不到 /usr/local/lib/libsnappy.a 。

尝试运行 clang -Xlinker -v ,请确保 /usr/local/lib 存在于中 Library search paths :

clang -Xlinker -v

@(#)PROGRAM:ld  PROJECT:ld64-278.4
configured to support archs: armv6 armv7 armv7s arm64 i386 x86_64 x86_64h armv6m armv7k armv7m armv7em (tvOS)
Library search paths:
    /usr/lib
    /usr/local/lib

通常,它会存在。然后试试看 sudo update_dyld_shared_cache 。

谈调试 cmake ,可以使用以下标志 --debug-output :

cmake --debug-output --trace --debug-trycompile ..

更新 :

check_library_exists(snappy snappy_compress "" HAVE_SNAPPY)

实际执行以下操作,它将尝试链接 snappy 并查找该函数是否存在:

cc  -DCHECK_FUNCTION_EXISTS=snappy_compress -Wl,-search_paths_first -Wl,-headerpad_max_install_names -o check_snappy_exist CheckFunctionExists.c -lsnappy

的来源 CheckFunctionExists.c 你可以找到 here 。
我认为这将简化问题。

Lu4 6 年前

我最终安装了 leveldb 具有 brew 。同样重要的是将XCode中的路径添加到 User Header Search Paths ,屏幕如下: