warning: always_inline function might not be inlinable [-Wattributes]

Question

when i try to include a .h file which consists of definition for inline functions as

__attribute__( ( always_inline ) ) __STATIC_INLINE uint32_t __SLA (int3         


        

Answer 1

For functions declared inline(!!!!), this attribute inlines the function independent of any restrictions that otherwise apply to inlining.

So, when you set the attribute without declaring the function inline you will get these warning. Declare the function additionally inline will void these warnings. Behavior gnu gcc/g++ 5.30

# define FORCE_INLINE __attribute__((always_inline)) inline

FORCE_INLINE vec3 operator- (vec3 a, vec3 b) { vec3 t = { a.x-b.x, a.y-b.y, a.z-b.z }; return t; }