How can I check via macro whether the GNU libstdc++ is used?

问题

How can I check via macro whether the (GNU GCC) libstdc++ STL implementation is used? Is that possible? I would like to have that working in both GCC and Clang.

For C++11 on Linux, it's probably anyway the only choice (or is it?). (STLport doesn't have C++11 support, AFAIK.) On MacOSX, (LLVM) libc++ STL is more likely, if you use Clang (maybe also for GCC, not sure).

回答1:

You can check for __GLIBCXX__ (or __GLIBCPP__, for releases before 3.4.0) macro existence, after including one of the C++ standard include files (cstddef is a good choice):

#include <cstddef>
#if defined(__GLIBCXX__) || defined(__GLIBCPP__)
  /* Using GNU GCC libstdc++, so using also its STL implementation */ 
#endif

Read more here:

• https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_macros.html
• https://gcc.gnu.org/onlinedocs/libstdc++/manual/abi.html
• https://gcc.gnu.org/onlinedocs/gcc-4.9.1/cpp/If.html

来源：https://stackoverflow.com/questions/25891868/how-can-i-check-via-macro-whether-the-gnu-libstdc-is-used