Re: [PATCH] coverage: filter out lib{fdt,elf}-temp.o

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Fri, Jan 19, 2024 at 09:43:30AM +0100, Michal Orzel wrote:
> Is my understanding correct that by switching from extra-y to targets we are 
> preventing these objects to
> appear in non-init-objects (and thus having COV_FLAGS appended) while 
> retaining the proper if_changed behavior?
> 
> According to docs/misc/xen-makefiles/makefiles.rst:
> Any target that utilises if_changed must be listed in $(targets),
> otherwise the command line check will fail, and the target will
> always be built.

Indeed, and $(extra-y) is added to $(targets) via
$(targets-for-builtin).

While switching from $(extra-y) to $(targets) prevents the objects from
been added to $(non-init-objets), it doesn't matter because "libelf.o"
is in that variable, so $(COV_FLAGS) is added to $(_c_flags) and its
value is used in all the prerequisites of "libelf.o" which includes
"libelf-temp.o" and for example "libelf-dominfo.o". So the only thing
preventing $(COV_FLAGS) from been added when building "libelf-tools.o"
for example is that we set `COV_FLAGS:=` for "libelf.o".

Cheers,

-- 
Anthony PERARD