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: ld -r frustration

On Thu, Jul 29, 2004 at 10:03:39AM +0100, Richard Earnshaw wrote:
> On Thu, 2004-07-29 at 03:31, Alan Modra wrote:
> > Incidentally, one of the nasty effects of ld -r on any arch is the fact
> > that it can reorder code.  eg. If compiling with -ffunction-sections,
> > all static functions called "setup" in different files will be grouped
> > into the one section.  This loses code locality and can affect cache
> > performance.
> I would expect that to happen on a normal link too.

No, it doesn't, at least not for sections handled by a properly written
linker script.  Here's a typical .text output section spec for a final

  .text :
    *(.text .stub .text.* .gnu.linkonce.t.*)
    KEEP (*(.text.*personality*))
    /* .gnu.warning sections are handled specially by elf32.em.  */

This places input sections matching .text, .stub, etc. in the same order
as they are found in the linker input.  See node "Input Section Basics"

Alan Modra
IBM OzLabs - Linux Technology Centre

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