[PATCH] D24644: Pass -ffunction-sections/-fdata-sections along to gold-plugin

Florian Hahn via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Tue Jun 27 09:28:23 PDT 2017

fhahn added a comment.

In https://reviews.llvm.org/D24644#792262, @mehdi_amini wrote:

> In https://reviews.llvm.org/D24644#792168, @fhahn wrote:
> > I'd like to fix PR22999 and was wondering if you think adding a function-section attribute to the IR would be a viable solution?
> >
> > When doing LTO, we could add the same function-section to each function in a module in the IRLinker. @mehdi_amini did you think something like that when suggesting using attributes?
> Not sure how this would work? How do you codegen half of the functions with function-section but not all? How is the backend supposed to behave if it starts with a function that isn't decorated with this attribute, then move to one that is, and finally proceed with one that isn't?

hm yes I guess we would have to group the functions by their function-section attribute, which isn't such a good idea probably.

@echristo you mentioned that the compiler maybe could determine if we should use function-sections during codegen, but it does not seem possible to determine the size of the code section before emitting all functions, at which point it is already too late. Maybe I am missing something?



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