The given function was selected for inline expansion, but the compiler did not perform the inlining.

Inlining is performed at the compiler's discretion. The inline keyword, like the register keyword, is used as a hint for the compiler. The compiler uses heuristics to determine if it should inline a particular function to speed up the code when compiling for speed, or if it should inline a particular function to make the code smaller when compiling for space. The compiler will only inline very small functions when compiling for space.

In some cases, the compiler will not inline a particular function for mechanical reasons. See C4714 for a list of reasons the compiler may not inline a function.

This warning is off by default. See Compiler Warnings That Are Off by Default for more information.