error: template specialization with C linkage

[HuberyQ]

When I was building the project, I met such a mistake: /usr/include/c++/9/tuple:875:3: error: template specialization with C linkage 875 | template<> | ^~~~~~~~ In file included from /usr/include/features.h:461, from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528, from /usr/include/c++/9/iostream:38, from file_system.cc:10: /usr/include/string.h:28:1: note: ‘extern "C"’ linkage started here 28 | __BEGIN_DECLS | ^~~~~~~~~~~~~ In file included from /usr/include/c++/9/bits/unique_ptr.h:37, from /usr/include/c++/9/bits/locale_conv.h:41, from /usr/include/c++/9/locale:43, from /usr/include/c++/9/iomanip:43, from ./strings.h:15, from /usr/include/string.h:432, from /usr/include/c++/9/cstring:42, from file_system.cc:15: /usr/include/c++/9/tuple:892:3: error: template with C linkage 892 | template<typename _T1, typename _T2> | ^~~~~~~~ In file included from /usr/include/features.h:461, from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528, from /usr/include/c++/9/iostream:38, from file_system.cc:10: /usr/include/string.h:28:1: note: ‘extern "C"’ linkage started here 28 | __BEGIN_DECLS | ^~~~~~~~~~~~~ In file included from /usr/include/c++/9/bits/unique_ptr.h:37, from /usr/include/c++/9/bits/locale_conv.h:41, from /usr/include/c++/9/locale:43, from /usr/include/c++/9/iomanip:43, from ./strings.h:15, from /usr/include/string.h:432, from /usr/include/c++/9/cstring:42, from file_system.cc:15: /usr/include/c++/9/tuple:1271:3: error: template with C linkage 1271 | template<typename... _Elements> | ^~~~~~~~ In file included from /usr/include/features.h:461, from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528, from /usr/include/c++/9/iostream:38, from file_system.cc:10: /usr/include/string.h:28:1: note: ‘extern "C"’ linkage started here 28 | __BEGIN_DECLS | ^~~~~~~~~~~~~ In file included from /usr/include/c++/9/bits/unique_ptr.h:37, from /usr/include/c++/9/bits/locale_conv.h:41, from /usr/include/c++/9/locale:43, from /usr/include/c++/9/iomanip:43, from ./strings.h:15, from /usr/include/string.h:432, from /usr/include/c++/9/cstring:42, from file_system.cc:15: /usr/include/c++/9/tuple:1284:3: error: template with C linkage 1284 | template<std::size_t __i, typename _Head, typename... _Tail> | ^~~~~~~~ In file included from /usr/include/features.h:461, from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528, from /usr/include/c++/9/iostream:38, from file_system.cc:10: /usr/include/string.h:28:1: note: ‘extern "C"’ linkage started here 28 | __BEGIN_DECLS | ^~~~~~~~~~~~~ In file included from /usr/include/c++/9/bits/unique_ptr.h:37, from /usr/include/c++/9/bits/locale_conv.h:41, from /usr/include/c++/9/locale:43, from /usr/include/c++/9/iomanip:43, from ./strings.h:15, from /usr/include/string.h:432, from /usr/include/c++/9/cstring:42, from file_system.cc:15: /usr/include/c++/9/tuple:1291:3: error: template with C linkage 1291 | template<typename _Head, typename... _Tail> | ^~~~~~~~ In file included from /usr/include/features.h:461, from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528, from /usr/include/c++/9/iostream:38, from file_system.cc:10: /usr/include/string.h:28:1: note: ‘extern "C"’ linkage started here 28 | __BEGIN_DECLS | ^~~~~~~~~~~~~ In file included from /usr/include/c++/9/bits/unique_ptr.h:37, from /usr/include/c++/9/bits/locale_conv.h:41, from /usr/include/c++/9/locale:43, from /usr/include/c++/9/iomanip:43, from ./strings.h:15, from /usr/include/string.h:432, from /usr/include/c++/9/cstring:42, from file_system.cc:15: /usr/include/c++/9/tuple:1300:3: error: template with C linkage 1300 | template<size_t __i> | ^~~~~~~~ In file included from /usr/include/features.h:461, from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39, from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528, from /usr/include/c++/9/iostream:38, from file_system.cc:10:

[zyl1223582136]

i hava the same problem, and i guess that contributes to mve