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[PATCH, ARM] Fix PR51643

From: Richard Earnshaw <rearnsha at arm dot com>
To: gcc-patches at gcc dot gnu dot org
Date: Thu, 22 Dec 2011 14:18:07 +0000
Subject: [PATCH, ARM] Fix PR51643

The ARM bare-metal configuration of the EABI specifies that an
unresolved weak direct call becomes a NOP rather than faulting; but this
is only supported for the BL instruction.  GCC mishandled this in some
cases by trying to convert such a call into a tail-call, but B
instructions are not covered by the requirement above, which means that
the optimization is unsafe.

Fixed thus:

2011-12-21  Richard Earnshaw  <rearnsha@arm.com>

	PR target/51643
	* arm.c (arm_function_ok_for_sibcall): Don't try to tailcall a
	weak function on bare-metal EABI targets.

2011-12-21  Richard Earnshaw  <rearnsha@arm.com>

	PR target/51643
	* gcc.target/arm/sibcall-2.c: New test.

Attachment: sib-weak.patch
Description: Text document

Follow-Ups:
- Re: [PATCH, ARM] Fix PR51643
  - From: Richard Henderson

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