c++ - Same STL files with different compilers -

there 2 binary files obtained same source file: 1 compiled clang++-3.6 , other 1 g++-4.8. in call function stl (std::unique, in particular) gdb brings me same file: /usr/include/c++/4.8/bits/stl_algo.h.

i expected implementations different each compiler though. clang , gcc share parts of c++ implementations?

i expected implementations different each compiler though. clang , gcc share parts of c++ implementations?

it's not share same c++ implementations, rather both compilers link same standard c++ library default on system.

i presume on linux, programs installed package manager link against libstdc++ (provided g++).

by default, when compiling clang++, libstdc++ used, when include iostream example, uses 1 /usr/include/c++/4.8.

if want link against llvm c++ library, need install "libc++-dev" package (name may vary depending on distro) , compile using: -stdlib=libc++ (instead of default: -stdlib=libstdc++).

example:

test.cpp:

    #include <iostream>      int main(int argc, char *argv[])     {         std::cout << "hello world!!!\n";          return 0;     } 

compiling using:

   $ clang++ -stdlib=libc++ -o test test.cpp 

will use header /usr/include/c++/v1 (from llvm)

but compiling using:

    $ clang++ -stdlib=libstdc++ -o test test.cpp  # or (assuming default on system libstdc++)      $ clang++ -o test test.cpp 

will use header /usr/include/c++/4.8 (from g++)