我正在尝试使用clang ++编译器在OS X 10.8上编译一些C ++代码（包括C ++ 11特性）。我有一个makefile生成目标文件OK，然后在命令：
clang++ -o Analysis.so -shared DataFile.o CR39DataFile.o
我在架构x86_64中找不到有关符号的大量错误。该代码在使用g ++的* nix系统上正常工作，并且适当地更改编译器标志以支持C ++ 11。要编译* .o，我这样做：
clang++ -c -Wall -std=c++11 -stdlib=libc++ -I../src ../src/DataFile.cc
编辑：链接命令的输出为：
clang++ -o Analysis.so -shared DataFile.o CR39DataFile.o
Undefined symbols for architecture x86_64:
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::find(char const*, unsigned long, unsigned long) const", referenced from:
CR39DataFile::read_thread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::find(char, unsigned long) const", referenced from:
CR39DataFile::trim(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::compare(char const*) const", referenced from:
CR39DataFile::read_thread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
"std::__1::__vector_base_common<true>::__throw_length_error() const", referenced from:
std::__1::vector<frame*, std::__1::allocator<frame*> >::__append(unsigned long) in CR39DataFile.o
std::__1::vector<std::__1::vector<frame*, std::__1::allocator<frame*> >*, std::__1::allocator<std::__1::vector<frame*, std::__1::allocator<frame*> >*> >::__append(unsigned long) in CR39DataFile.o
"std::__1::__vector_base_common<true>::__throw_out_of_range() const", referenced from:
std::__1::vector<std::__1::vector<frame*, std::__1::allocator<frame*> >*, std::__1::allocator<std::__1::vector<frame*, std::__1::allocator<frame*> >*> >::at(unsigned long) in CR39DataFile.o
std::__1::vector<frame*, std::__1::allocator<frame*> >::at(unsigned long) in CR39DataFile.o
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::erase(unsigned long, unsigned long)", referenced from:
CR39DataFile::trim(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::assign(char const*)", referenced from:
CR39DataFile::CR39DataFile() in CR39DataFile.o
CR39DataFile::clear() in CR39DataFile.o
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::insert(unsigned long, unsigned long, char)", referenced from:
CR39DataFile::read_thread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::resize(unsigned long, char)", referenced from:
CR39DataFile::read_thread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::reserve(unsigned long)", referenced from:
CR39DataFile::read_thread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)", referenced from:
DataFile::read(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, bool) in DataFile.o
DataFile::write(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, bool) in DataFile.o
std::__1::thread::thread<bool (DataFile::*)(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >), DataFile*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, void>(bool (DataFile::*)(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)&&, DataFile*&&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&&&) in DataFile.o
CR39DataFile::read_thread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
CR39DataFile::write_thread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
CR39DataFile::write_thread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, float, float, float, float, float, float, float, float, float, float) in CR39DataFile.o
CR39DataFile::write_thread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, float, float, float, float, float, float) in CR39DataFile.o
...
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, unsigned long, unsigned long, std::__1::allocator<char> const&)", referenced from:
CR39DataFile::read_thread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_string()", referenced from:
DataFile::~DataFile() in DataFile.o
DataFile::read(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, bool) in DataFile.o
DataFile::write(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, bool) in DataFile.o
std::__1::thread::thread<bool (DataFile::*)(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >), DataFile*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, void>(bool (DataFile::*)(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)&&, DataFile*&&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&&&) in DataFile.o
void* std::__1::__thread_proxy<std::__1::tuple<bool (DataFile::*)(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >), DataFile*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > >(void*) in DataFile.o
std::__1::__tuple_leaf<2ul, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, false>::~__tuple_leaf() in DataFile.o
CR39DataFile::CR39DataFile() in CR39DataFile.o
...
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::operator=(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)", referenced from:
CR39DataFile::set_file_path(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
CR39DataFile::set_file_auxpath(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in CR39DataFile.o
"std::__1::__thread_struct::__thread_struct()", referenced from:
void* std::__1::__thread_proxy<std::__1::tuple<bool (DataFile::*)(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >), DataFile*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > >(void*) in DataFile.o
"std::__1::__thread_struct::~__thread_struct()", referenced from:
std::__1::__thread_specific_ptr<std::__1::__thread_struct>::reset(std::__1::__thread_struct*) in DataFile.o
"std::__1::__thread_local_data()", referenced from:
void* std::__1::__thread_proxy<std::__1::tuple<bool (DataFile::*)(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >), DataFile*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > >(void*) in DataFile.o
"std::__1::__throw_system_error(int, char const*)", referenced from:
std::__1::thread::thread<bool (DataFile::*)(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >), DataFile*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, void>(bool (DataFile::*)(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)&&, DataFile*&&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&&&) in DataFile.o
"std::__1::thread::~thread()", referenced from:
DataFile::cleanup_file_io() in DataFile.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Analysis.so] Error 1
答案 0 :(得分：29)
我怀疑这个问题是因为OS X下可用的两个C ++运行时库。使用以下命令链接动态库：
clang++ -stdlib=libc++ -o Analysis.dylib -shared DataFile.o CR39DataFile.o
（-stdlib=libc++是关键区别）。我认为默认的C ++运行时是GNU实现，当您使用libc ++实现进行编译时，这会使链接器感到困惑。
答案 1 :(得分：1)
作为补充，面对相同的错误消息，我发现我需要使用public EmpEntity insertReq(String numEmp) {
String query = " call TEST_PKG.insert_req(" + numEmp + ",req_type,req_seq ) " ;
SQLQuery sqlQuery = this.getSession().createSQLQuery(query);
sqlQuery.executeUpdate();
sqlQuery.setResultTransformer(Transformers.aliasToBean(
EmpEntity.class));
List<EmpEntity> list = sqlQuery.list();
EmpEntity empEntity=list.get(0);
empEntity.setRequestType(.....);
empEntity.setRequestSec(....);
return empEntity;
}
（需要stdc ++部分）。