On Thu, 21 Oct 2021 at 13:06, Xi Ruoyao via Gcc-help <gcc-help@xxxxxxxxxxx> wrote: > > On Thu, 2021-10-21 at 11:36 +0800, 桂永林 wrote: > > If there is some special parameter we need check, when we link the c++ > > lib to C program with C linker? > > -lstdc++ is enough as you've already disabled exception and rtti. If > exception or rtti is used, -lsupc++ is also needed. No, everything in libsupc++ is also included in libstdc++ so you do not need both. libsupc++ is for when you *only* want the language support, not the library utilities like iostreams, std::string, std::list etc. But libsupc++ is not just for exceptions and RTTI, it's also new and delete, and initialization of local static variables. So if you haven't used -lstdc++ then you need -lsupc++ to be able to use those basic features. If you have used -lstdc++, you don't need -lsupc++ for anything. If you simply use g++ to link instead of gcc then you get -lstdc++ automatically. That's the recommended way to link a program that has C++ components. Since you've only told us that "the program have runtime logic problem sometimes" nobody can really help you. That's too vague for us to know what the problem is.
