Question

我目前正在尝试编译需要Boost :: Regex的Contraction Hierachies implementation by KIT。提供的Makefile已经确保（我也手动仔细检查过）g ++随-lboost_regex开关一起提供。如果没有安装库，g ++会抱怨。

所以我从我的包源安装了库，并再次尝试编译。这次我得到了很多关于Boost :: Regex的链接器错误。这是一个简短的摘录：

main.o: In function `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::unwind_extra_block(bool)':
main.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE18unwind_extra_blockEb[_ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE18unwind_extra_blockEb]+0x2c): undefined reference to `boost::re_detail::put_mem_block(void*)'
main.o: In function `void boost::re_detail::raise_error<boost::regex_traits_wrapper<boost::regex_traits<char, boost::cpp_regex_traits<char> > > >(boost::regex_traits_wrapper<boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::error_type)':
main.cpp:(.text._ZN5boost9re_detail11raise_errorINS_20regex_traits_wrapperINS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEEEvRKT_NS_15regex_constants10error_typeE[_ZN5boost9re_detail11raise_errorINS_20regex_traits_wrapperINS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEEEvRKT_NS_15regex_constants10error_typeE]+0x7d): undefined reference to `boost::re_detail::get_default_error_string(boost::regex_constants::error_type)'
main.cpp:(.text._ZN5boost9re_detail11raise_errorINS_20regex_traits_wrapperINS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEEEvRKT_NS_15regex_constants10error_typeE[_ZN5boost9re_detail11raise_errorINS_20regex_traits_wrapperINS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEEEvRKT_NS_15regex_constants10error_typeE]+0xb1): undefined reference to `boost::re_detail::raise_runtime_error(std::runtime_error const&)'
main.cpp:(.text._ZN5boost9re_detail11raise_errorINS_20regex_traits_wrapperINS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEEEvRKT_NS_15regex_constants10error_typeE[_ZN5boost9re_detail11raise_errorINS_20regex_traits_wrapperINS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEEEvRKT_NS_15regex_constants10error_typeE]+0xcb): undefined reference to `boost::re_detail::get_default_error_string(boost::regex_constants::error_type)'
main.o: In function `__gnu_cxx::__normal_iterator<char const*, std::string> boost::re_detail::re_is_set_member<__gnu_cxx::__normal_iterator<char const*, std::string>, char, boost::regex_traits<char, boost::cpp_regex_traits<char> >, unsigned int>(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>, boost::re_detail::re_set_long<unsigned int> const*, boost::re_detail::regex_data<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, bool)':
main.cpp:(.text._ZN5boost9re_detail16re_is_set_memberIN9__gnu_cxx17__normal_iteratorIPKcSsEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEjEET_SB_SB_PKNS0_11re_set_longIT2_EERKNS0_10regex_dataIT0_T1_EEb[_ZN5boost9re_detail16re_is_set_memberIN9__gnu_cxx17__normal_iteratorIPKcSsEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEjEET_SB_SB_PKNS0_11re_set_longIT2_EERKNS0_10regex_dataIT0_T1_EEb]+0x17b): undefined reference to `boost::re_detail::cpp_regex_traits_implementation<char>::transform_primary(char const*, char const*) const'
main.cpp:(.text._ZN5boost9re_detail16re_is_set_memberIN9__gnu_cxx17__normal_iteratorIPKcSsEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEjEET_SB_SB_PKNS0_11re_set_longIT2_EERKNS0_10regex_dataIT0_T1_EEb[_ZN5boost9re_detail16re_is_set_memberIN9__gnu_cxx17__normal_iteratorIPKcSsEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEjEET_SB_SB_PKNS0_11re_set_longIT2_EERKNS0_10regex_dataIT0_T1_EEb]+0x4c0): undefined reference to `boost::re_detail::cpp_regex_traits_implementation<char>::transform(char const*, char const*) const'
main.o: In function `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::extend_stack()':
main.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE12extend_stackEv[_ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE12extend_stackEv]+0x18): undefined reference to `boost::re_detail::get_mem_block()'
main.o: In function `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::match_imp()':
main.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE9match_impEv[_ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE9match_impEv]+0xc): undefined reference to `boost::re_detail::get_mem_block()'
main.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE9match_impEv[_ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE9match_impEv]+0x19e): undefined reference to `boost::re_detail::verify_options(unsigned int, boost::regex_constants::_match_flags)'
main.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE9match_impEv[_ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE9match_impEv]+0x254): undefined reference to `boost::re_detail::put_mem_block(void*)'
main.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE9match_impEv[_ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE9match_impEv]+0x3c6): undefined reference to `boost::re_detail::put_mem_block(void*)'

这看起来非常像编译器根本找不到库。实际上，当我不提供-lboost_regex开关时，输出保持不变（我在其上运行了哈希）。

但是，使用nuwen MinGW + Boost- error linking boost_regex中建议的-Wl,--verbose开关运行链接器会显示找到该库：

attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libboost_regex.so succeeded
-lboost_regex (/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libboost_regex.so)

我所知道的是，这可能是一个不同于软件编写时的版本（我不知道哪个。我现在使用的是1.53。）但从查看代码看起来它仍然应该工作。此外，我正在使用此boost版本的标头，因此如果函数签名已更改，编译器应该已经抱怨。

如何才能将其链接起来？我错过了什么吗？

Answer 1

链接器开关的顺序错误。 make尝试这样做：

g++ -lboost_regex -lboost_iostreams -o main main.o

这实际上是有效的（至少使用gcc 4.8.1）：

g++ -o main main.o -lboost_regex -lboost_iostreams

因此，要修复编译错误，您应该使用以下内容替换Makefile中的第6行：

    $(CXX) -o $@ $^ $(LIBS) $(LINK)

Answer 2

如果您有多个可用的 boost 版本，并且链接器路径和包含路径指向不同的版本，则 Boost 正则表达式（可能还有其他 boost 库）也可能无法链接（这发生在我使用 cmake 时使用 {{1 }} 其中指定了路径，同时在系统根目录中安装了不同的版本。

cmake 的解决方案是将 find_package(Boost ...) 添加到 CMakeLists.txt 并确保 target_link_libraries 中的链接顺序正确。

无法链接Boost正则表达式

2 个答案: