gcc -ffunction-sections -Wl,--gc-sections

[Adam Jackson]

On Thu, 2011-03-24 at 15:00 +0100, Jan Kratochvil wrote:
> Hi,
> 
> just tried -ffunction-sections -Wl,--gc-sections on F15 xulrunner and got
> libxul.so 24947928 -> 23631640 (5.28% gain) and it still works.
> 
> ld.gold --icf is a different optimization but that one requires gold.
>
> Are there some serious Bugs why Fedora is not using it?

What are the criteria for section gc?

For example, if I'm the X server, I have a bunch of symbols exported
from the binary that the drivers are expected to call, but that are
never called from the server itself.  Does marking a function
__attribute__((visibility("default"))) mark it as used from the garbage
collector's perspective?

- ajax
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