This is the mail archive of the mailing list for the binutils project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Map "" and ".text.unlikely" input section prefixes to separate output sections.

On Tue, Nov 20, 2012 at 9:50 AM, Sriraman Tallam <> wrote:
> On Mon, Nov 19, 2012 at 4:52 PM, Ian Lance Taylor <> wrote:
>> On Mon, Nov 19, 2012 at 2:52 PM, Alan Modra <> wrote:
>>> On Fri, Nov 16, 2012 at 05:19:01PM -0800, Ian Lance Taylor wrote:
>>>> On Wed, Nov 14, 2012 at 5:06 PM, Sriraman Tallam <> wrote:
>>>> >> Ideally gold should group all input sections with the same name
>>> I strongly disagree.  Grouping sections with the same name is a bad
>>> idea, unless the name gives you some infomation from the compiler (as
>>> it does with* et al).  The problem with grouping sections
>>> with the same name is that with -ffunction-sections objects, you'll
>>> potentially move functions away from their callers, losing cache
>>> locality.  The canonical example is a number of object files with
>>> static "setup" functions.  These will all have code in .text.setup,
>>> but there is no good reason to group these sections.
>> That is a good point.
>> Unfortunately it leaves us adding more special cases for section
>> names, which I really dislike.  Is there any happy medium?
> gold now has multiple ways to reorder functions. There is the
> --section-ordering-file option, there is the plugin interface, and
> also the reordering via linker scripts.  So, instead of adding another
> way to sort text sections, I was wondering instead if we could just
> use the --section-ordering-file  mechanism.  I can initialize the data
> structures to do this ordering by default.  Is this a reasonable idea?

Sure, if it works, and if using the --section-ordering-file option
doesn't discard the defaults unnecessarily.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]