modules/core/src/arithm.cpp:345:51:
error: constant expression evaluates to 4294967295 which cannot be narrowed to type 'int' [-Wc++11-narrowing]
static int CV_DECL_ALIGNED(16) v64f_absmask[] = { 0xffffffff, 0x7fffffff, 0xffffffff, 0x7fffffff };
                                                  ^~~~~~~~~~

Converted to unsigned int.  This variable is only used to initialize a bit pattern anywhy for a 128bit type.

Per https://github.com/Itseez/opencv/pull/2783#discussion_r13573590

An extremely rare case where, for numeric reasons bestM finds more inliers than ninliersMax. 
This RARE case causes memory corruption and a nasty seg fault.