C++ errors while compiling

Question

I am trying to compile a game, but getting 100+ errors like:

C:\Users\AppData\Local\Temp\cctQCagR.o: In function `load_image(std::string)': main.cpp:(.text+0x4bd4): undefined reference to `std::string::c_str() const' C:\Users\Bill\AppData\Local\Temp\cctQCagR.o: In function `createShip(float, float)': main.cpp:(.text+0x4da4): undefined reference to `std::allocator<char>::allocator()' main.cpp:(.text+0x4dbc): undefined reference to `std::basic_string<char, std::char_tra its<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> cons t&)' main.cpp:(.text+0x4de4): undefined reference to `std::basic_string<char, std::char_tra its<char>, std::allocator<char> >::~basic_string()' main.cpp:(.text+0x4e04): undefined reference to `std::basic_string<char, std::char_tra its<char>, std::allocator<char> >::~basic_string()' main.cpp:(.text+0x4e1c): undefined reference to `std::allocator<char>::~allocator()' main.cpp:(.text+0x4e28): undefined reference to `std::allocator<char>::allocator()' main.cpp:(.text+0x4e40): undefined reference to `std::basic_string<char, std::char_tra its<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> cons t&)' main.cpp:(.text+0x4e60): undefined reference to `std::allocator<char>::~allocator()' main.cpp:(.text+0x4e70): undefined reference to `__cxa_end_cleanup' main.cpp:(.text+0x4e98): undefined reference to `std::basic_string<char, std::char_tra its<char>, std::allocator<char> >::~basic_string()' main.cpp:(.text+0x4eb8): undefined reference to `std::basic_string<char, std::char_tra its<char>, std::allocator<char> >::~basic_string()' main.cpp:(.text+0x4ed0): undefined reference to `std::allocator<char>::~allocator()' main.cpp:(.text+0x4ef4): undefined reference to `std::allocator<char>::~allocator()' main.cpp:(.text+0x4f04): undefined reference to `__cxa_end_cleanup' C:\Users\Bill\AppData\Local\Temp\cctQCagR.o: In function `load_files()': main.cpp:(.text+0x5164): undefined reference to `std::allocator<char>::allocator()' main.cpp:(.text+0x517c): undefined reference to `std::basic_string<char, std::char_tra its<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> cons t&)'

You're getting linker errors. Are all the libraries involved using the same version of the same compiler, using the same runtime settings? — Billy ONeal
– Billy ONeal, Commented Jun 21, 2010 at 2:35
You need to post more context to your question. What, for example, is contained in Particle_Engine.h (post the code), or is it a third-party header? Also, you should tell us the entire command you're using when compiling. — Jacob
– Jacob, Commented Jun 21, 2010 at 3:36
You shouldn't change a question to something totally else. Accept an appropriate answer to your original question and then start a new question with your new problems. I went in and did a rollback to your original question so that the answers still make sense. — sbi
– sbi, Commented Jun 21, 2010 at 6:30

LiraNuna · Accepted Answer · 2010-06-21 03:03:09Z

I believe you're trying to compile main.cpp with gcc instead of g++.

#include <string> #include <stdio.h> int main() { std::string bla; bla = "BLA BLA"; printf("%s\n",bla.c_str()); return 0; }

If you build the above code snippet with gcc you get the errors you mention. If you use g++ it build ok, this makes sense since g++ will make sure all the proper stuff it put together when build C++.

@xji gcc compiles C, g++ compiles C++. Your code is probably C++ so that's why it doesn't work with gcc.

ks1322 · Accepted Answer · 2018-07-03 08:57:11Z

You need to link your binary with libstdc++. You need to explicitly specify it in command line if using gcc:

gcc -lstdc++ tmp.cpp

If using g++, libstdc++ will be linked by default:

g++ tmp.cpp

This seems to be a more valid answer. Was the same for clang as well.

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