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[Bug target/51643] Incorrect code produced for tail-call of weak function with -O2/-O3 option
- From: "sipych at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 20 Dec 2011 21:58:39 +0000
- Subject: [Bug target/51643] Incorrect code produced for tail-call of weak function with -O2/-O3 option
- Auto-submitted: auto-generated
- References: <bug-51643-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51643
--- Comment #4 from Alexander Osipenko <sipych at gmail dot com> 2011-12-20 21:58:39 UTC ---
>From ARM EABI specification (doc: ARM IHI 0044A)
"On platforms that do not support dynamic pre-emption of symbols an unresolved
weak reference to a symbol relocated by R_ARM_CALL shall be treated as a jump
to the next instruction (the call becomes a no-op). The behaviour of
R_ARM_JUMP24 in these conditions is unspecified."
At least, tail call + epilogue shall not be replaced by (undefined) JUMP.