gcc vs. g++: compiler issues

The GCC package contains compilers for several different languages. The extension on the source-file determines which language the compiler will recognise, but the name that you use to invoke the compiler will determine which libraries will be included by default.

With the .cpp extension, your source file will be compiled as a C++
source file. But, by using the name gcc to call the compiler, you are effectively saying that you only need the C libraries. To get the C++ libraries, you should use the name g++: g++ -o test test.cpp