[Bug target/98112] Add -fdirect-access-external-data & drop HAVE_LD_PIE_COPYRELOC

["segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98112

Segher Boessenkool <segher at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |segher at gcc dot gnu.org

--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Fangrui Song from comment #3)
> Are you happy with the option name -f[no-]direct-access-external-data ?

Not at all, no :-(

The name does not explain its purpose at all, and the whole concept only
makes sense for a fraction of all targets.  A -mcopy-relocs ("generate copy
relocations if that is a good idea"), defined *per target*, would be a lot
better, or a -mpic-use-copy-relocs (since you say it is *not* just for pie),
or something like that.  You want to have this a generic option, while it is
not clear at all what it would mean, what it would *do*, which is especially
important if you want this to be an option used by multiple compilers: if it
is not clear to every user what simple, sensible thing a flag is the knob
for, that flag simply cannot be used at all -- or worse, some users *will*
use it, but then their intentions are not clear to humans, and different
compilers can (and will!) think the user wanted something else!