C++11 cmath functions not in std namespace for android NDK w/gcc-4.8 or clang 3.4

Question

After C++11, various cmath functions previously in the global namespace are moved to the std namespace, when including the h

Answer 1

This seems to be a known issue with C++11 support on android. There is a known issue that indicates that a lot of the routines are missing:

When compiling c++ code with -std=c++11 and using gnustl_shared, many C99 math functions are not provided by the header as they should.

You're probably better off assuming that only a limited subset of the c++ library is available for android - this seems to be indicated in the CPLUSPLUS-SUPPORT.html file in the docs/ for the ndk.

Mind you when I have:

APP_STL := c++_static

in my Application.mk and

LOCAL_CPPFLAGS  := -std=c++11

in my Android.mk, then files making use of std::cbrt and std::round compile cleanly; but it is against the static LLVM libc++, rather than against the gnu standard library.