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Re: Can LTO minor version be updated in backward compatible way ?

From: Andi Kleen <ak at linux dot intel dot com>
To: Romain Geissler <romain dot geissler at amadeus dot com>
Cc: <gcc at gcc dot gnu dot org>
Date: Wed, 17 Jul 2019 10:29:58 -0700
Subject: Re: Can LTO minor version be updated in backward compatible way ?
References: <alpine.LSU.2.20.1907171350160.51264@ncerndobedev5004.etv.nce.amadeus.net>

Romain Geissler <romain.geissler@amadeus.com> writes:
>
> I have no idea of the LTO format and if indeed it can easily be updated
> in a backward compatible way. But I would say it would be nice if it
> could, and would allow adoption for projects spread on many teams
> depending on each others and unable to re-build everything at each
> toolchain update.

Right now any change to an compiler option breaks the LTO format
in subtle ways. In fact even the minor changes that are currently
done are not frequent enough to catch all such cases.

So it's unlikely to really work.

-Andi

Follow-Ups:
- Re: Can LTO minor version be updated in backward compatible way ?
  - From: Jeff Law
- Re: Can LTO minor version be updated in backward compatible way ?
  - From: Richard Biener

References:
- Can LTO minor version be updated in backward compatible way ?
  - From: Romain Geissler

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