In C99 'inline' is not a hint to the compiler to inline the function,
it is an attribute that affects the linkage of the function. 'inline'
functions are required to have a definition in a different compiliation
unit, so compilers are free to delete 'inline' functions if they want to.
This issue can be seen in Clang when compiling at -O0. Clang
will sometimes delete 'inline' functions which creates an invalid
program.
Issue 3746: http://code.opencv.org/issues/3746
934394c5e2