[PATCH] Disable x86 tail call optimization under PIC mode

[Reid Kleckner]

I'm coming around to the position that we should simply disable this
optimization for PIC calls to symbols with default visibility. The current
change disables all tail calls when generating PIC code, which is
undesirable.

We can add a flag later if someone asks, and call it
-f[no-]optimize-pic-sibling-calls.

On Wed, May 27, 2015 at 10:34 AM, David <davidxl at google.com> wrote:

> Changing the default may affect users who depend on the current behavior
> which has been the case for a couple of releases.   Another possible
> solution is to emit a warning for cases like this so that debugging similar
> issues in the future will become easier.
>
>
> http://reviews.llvm.org/D9799
>
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