On Wed, 21 Aug 2024 07:05:39 +0900
Masami Hiramatsu (Google) [off-list ref] wrote:

Does the noinline attribute prevent embedding callsite too? I mean

extern callee()

noinline callee()
{
...
}

caller()
{
	callee() // (*)
}

In this case, does noinline prevent LTO to embed the callee at the callsite(*)
or prevent LTO remove the callee() symbol?

Even though we have it passed as a parameter, I think the compiler and
linker is smart enough to see that and notice its use, and that the
function passed in is a nop, which doesn't break the flow.

Can you add the __used and see if it fixes it?

-- Steve