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Re: TLS, gcc optimizations, and PIC on x86

From: Ian Lance Taylor <iant at google dot com>
To: Kevin Klues <klueska at cs dot berkeley dot edu>
Cc: gcc-help at gcc dot gnu dot org
Date: Wed, 31 Aug 2011 22:00:56 -0700
Subject: Re: TLS, gcc optimizations, and PIC on x86
References: <CAJR1fVoBxoqfBCAi8wY2qWWrCrjq-M4t56b2+ViraLRu1Kzy7g@mail.gmail.com>

Kevin Klues <klueska@cs.berkeley.edu> writes:

> Specifically, I want to be able to change the value of my TLS
> descriptor as well as access TLS variables from that new descriptor
> within the body of a single function.

As you've discovered, gcc does not support that.  It seems like a highly
unusual feature to want.  It would not be hard to change gcc to add an
option to support this, but I'm not sure it's worth the ongoing
maintenance cost.

Ian

Follow-Ups:
- Re: TLS, gcc optimizations, and PIC on x86
  - From: Kevin Klues

References:
- TLS, gcc optimizations, and PIC on x86
  - From: Kevin Klues

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