On 2011-08-03, Peter Bigot <big...@acm.org> wrote:
> The library archives are built so that unreferenced functions are not
> linked in.
There are other files in most projects besides the library archives. ;)
> Furthermore, I believe gc-sections operates on whole sections, not
> functions, so unless you have code built with -ffunction-sections it
> would make no difference.
Yes, in order for gc-sections to be useful you need to use
-ffunction-sections and -fdata-sections -- and that's generally how
people use it.
> Until the binutils update from half an hour ago, I have no reason to
> believe mspgcc supported -ffunction-sections correctly.
The old 3.x version did. I used it for years.
> (The linker changes will not be back-ported to the 4.5.3 LTS
> release.) The same should hold for -fdata-sections.
Are you saying that -fdata-sections is broken in recent versions of
mspgcc?
> If you see a reduction in code size when you use --gc-sections, and
> what it removes really wasn't necessary, figure out why it got put in
> there in the first place and fix it there.
That's pretty narrow-minded.
When reusing code, it's _very_ useful to be able to put a set of
related functions in a single file so that you can avoid name-space
issues and only expose certain selected names in the global namespace.
If all of the functions aren't needed for a given project, you
-ffunction-sections and -gc-sections can be used to discard the ones
that aren't needed. This has been a common way of doing things for a
long time. I've been using it for at least a dozen years and I
certainly didn't invent it. I don't see how you can decided all of a
sudden that it's not valid.
Putting each function in a separate file produces a big mess both --
both in relation to namespace pollution and managing source files.
--
Grant Edwards grant.b.edwards Yow! ... the HIGHWAY is
at made out of LIME JELLO and
gmail.com my HONDA is a barbequeued
OYSTER! Yum!
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