tree 7226319ae6b197185fa9301e831f5dc75742ac69
parent ef9e8fbfbc904b2c49cdf4fc7524aaf0f059f2da
author Than McIntosh <thanm@google.com> 1592248611 -0400
committer Than McIntosh <thanm@google.com> 1592392512 +0000

[dev.link] cmd/link: reduce alignment requirement for symtab/elfstr

The linker's asmb phase for ELF has a chunk of code that decides where
to place the .symtab and .strtab sections, which appear after after
the DWARF data; this code currently tries to align the start of the
.symtab section using the value of -R (stored in *FlagRound). This
patch gets rid of this additional alignment and instead just aligns
.symtab by pointer size. The -R value is needed for loadable
segments/sections (such as text or data), not for non-loadable
sections (e.g. symtab). On most architectures the *FlagRound value is
4k, however on ARM64 it is 64k, meaning that aligning symtab on this
boundary can waste a good chunk of space.

Change-Id: Ib51f3ad5611f5614768355eb8533084ba117a8e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/238019
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>