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Re: Optimization across translation units
- From: Brian Budge <brian dot budge at gmail dot com>
- To: richard Cavell <richardcavell at mail dot com>
- Cc: gcc-help at gcc dot gnu dot org
- Date: Wed, 27 Apr 2011 20:47:48 -0700
- Subject: Re: Optimization across translation units
- References: <20110428023421.163390@gmx.com>
On Wed, Apr 27, 2011 at 7:34 PM, richard Cavell <richardcavell@mail.com> wrote:
> Hi everyone.
>
> For manageability, I have broken up one source file that was 1500 lines long into several that are each a couple of hundred lines long.? Now my executable is bigger.? In order to make it work I had to take some functions that were static and make them non-static (and extern them in a .h file).? It is obvious that the compiler is no longer able to optimize as much.
>
> Does anyone have any ideas on how to get decent optimization where a function is calling a function in a different translation unit?
>
> Richard
>
You should look into link-time optimization (LTO). I think this is
supported in the more recent versions of gcc.
Brian