[Bug target/51643] Incorrect code produced for tail-call of weak function with -O2/-O3 option

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51643

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Target|                            |arm-eabi

--- Comment #7 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-12-21 09:53:24 UTC ---
Technically this bug is invalid (undefined is undefined, not consistent).  ARM
maintainers may want to disallow tail/sibling calls to possibly weak targets.

The ABI is inconsistent itself, btw, as

 weak_fn ();

beahaves different than

 *(&weak_fn) ();

as I presume the linker cannot do anything for indirect calls to weak
functions.