Using a C++ Library in a C Project causes a long list of errors

I have a C Project which uses a C++ library. However, if i compile the C Project i get a long list of "undefined reference to XY" errors. Those errors are caused by C++ references: Errors while compiling: ``` In function `<c function>': implicit declaration of function `<function>' [...] ``` (list shorted) Where <c function> is the calling function from C Project and <function> the function from the C++ library. Errors while linking: ``` undefined reference to `std::cerr' undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)' undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <char, std::char_traits<char>, std::allocator<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' [...] undefined reference to `__gxx_personality_v0' more undefined references to `__gxx_personality_v0' follow ``` (lots of errors - example shorted) In the static C++ library my types / functions are enclosed by `extern "C"` block: ``` #ifdef __cplusplus extern "C" { #endif void example(); #ifdef __cplusplus } #endif ``` To ensure this, all the `#include`'s referring to C++ library are surrounded by such a `extern "C"` block too. Compiler: The C++ library is compiled using g++, the C project using gcc - both from MinGW. CL (Linking): `gcc -L<search-path here> -shared [...] -lstdc++ -l<C++ library set here>` Please note the `-lstdc++` flag. Note: - The C project contains only `.c` and `.h` files – no `.cpp` - Putting a "dummy" cpp file in like stated here didn't work - MinGW and Eclipse CDT Indigo - The C++ Library has a name like `lib<NAME>.a` - it's linked with `-l<NAME>`, search path is set. Edit: Using `g++` as linker: `undefined reference to `std::cerr'` etc. are gone, but i get another list of errors: ``` Warning: .drectve `-aligncomm:"___hexdig_D2A",5' unrecognized undefined reference to `<function / class / method from C++ Library>' [...] undefined reference to `_Unwind_Resume' [...] undefined reference to `__gxx_personality_v0' more undefined references to `__gxx_personality_v0' follow undefined reference to `__chkstk_ms' [...] ``` (list shorted) eg. `_Unwind_Resume` is available in `nm` of the c++ library. Example: This part is in the Library (C++): Test.h - Header ``` #ifndef TEST_H_ #define TEST_H_ // --- Pure C++ here --- #ifdef __cplusplus #include <string> /* (1) */ class Test { public: Test(); void aMethod(); private: int i; }; #endif // --- Mixed (C / C++ ) here --- #ifdef __cplusplus extern "C" { #endif extern void doTest(); extern void invoke(); #ifdef __cplusplus } #endif #endif /* TEST_H_ */ ``` Test.cpp - Implementation of C++ part ``` #include "Test.h" Test::Test() : i(0) { } void Test::aMethod() { this->i++; } void invoke() { Test i; i.aMethod(); } ``` Test.c - Implementation of C Interface (still in library!) ``` #include "Test.h" void doTest() { invoke(); } ``` Now, here comes the part of the second project (pure C): ``` #include "Test.h" int main(int argc, char* argv[]) { doTest(); return 0; } ``` `(1)`: If i remove that include i can compile the C Project. But adding one include for any kind of class or c++ stuff causes lots of errors while linking. unfortunately i need to include classes etc.. Btw. here's the error i get for this example: ``` Test.cpp:(.text+0x1b): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()' Test.cpp:(.text+0x64): undefined reference to `_Unwind_Resume' Test.cpp:(.text$_ZN4TestD1Ev[Test::~Test()]+0x12): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()' Test.cpp:(.eh_frame+0x6b): undefined reference to `__gxx_personality_v0' ``` setting `-lstdc++` flag after (!) the flag for the library i get "only" these: ``` Test.cpp:(.text+0x64): undefined reference to `_Unwind_Resume' Test.cpp:(.eh_frame+0x6b): undefined reference to `__gxx_personality_v0' ```