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Re: RFA: Set default optimization level to -O2 for -flto

From: Nick Clifton <nickc at redhat dot com>
To: Basile Starynkevitch <basile at starynkevitch dot net>
Cc: gcc-patches at gcc dot gnu dot org, fche at redhat dot com
Date: Fri, 19 Mar 2010 14:58:44 +0000
Subject: Re: RFA: Set default optimization level to -O2 for -flto
References: <m3zl24xx3t.fsf@redhat.com> <4BA3840B.8080007@starynkevitch.net>

Hi Basile,

but my personal feeling is
that make a warning -or perhaps even an error- at link time if the
optimization is less than at compile time.

I think that a warning would be better than an error because the user might deliberately wish to use a lower optimization level. (For example because they suspect that there is a bug in the optimizer and they are trying to prove this).

Also I think that it would be best to only issue the warning if *no* -O<n> or -Os switch is specified on the command line. This is again because the user may have a good reason for selecting a low optimization level.

Cheers
  Nick

References:
- RFA: Set default optimization level to -O2 for -flto
  - From: Nick Clifton
- Re: RFA: Set default optimization level to -O2 for -flto
  - From: Basile Starynkevitch

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