Hi! On Wed, Jan 13, 2021 at 05:30:35PM +0100, Fredrik Noring wrote: > Many thanks, Alexander, > > > Please invoke objdump with -dr instead to see the relocations. > > Indeed: > > 1a: 4eb9 0000 0000 jsr 0 <memset2> > 1c: R_68K_32 memset Yup, always always always use -dr :-) > > The relocation associated with this instruction should point to memset. > > Most likely the compiler is optimizing your memset2 function to call > > the standard function 'memset'. > > > > When implementing memset itself you need to pass -ffreestanding to GCC, > > which will disable this optimization. > > Yes, I had -nostdlib but -ffreestanding is apparently needed as well. Thanks > again. You probably want -ffreestanding anyway for your situation: -nostdlib does not mean "there is no standard library", it just means "do not link with it". For the archives, no one has said it yet: to just disable the optimisation transforming the loop into a memset, you can use -fno-tree-loop-distribute-patterns . Segher
