llvm-project

ebb326a5 - [ELF] Fix unnecessary inclusion of unreferenced provide symbols

[ELF] Fix unnecessary inclusion of unreferenced provide symbols Previously, linker was unnecessarily including a PROVIDE symbol which was referenced by another unused PROVIDE symbol. For example, if a linker script contained the below code and 'not_used_sym' provide symbol is not included, then linker was still unnecessarily including 'foo' PROVIDE symbol because it was referenced by 'not_used_sym'. This commit fixes this behavior. PROVIDE(not_used_sym = foo) PROVIDE(foo = 0x1000) This commit fixes this behavior by using dfs-like algorithm to find all the symbols referenced in provide expressions of included provide symbols. This commit also fixes the issue of unused section not being garbage-collected if a symbol of the section is referenced by an unused PROVIDE symbol. Closes #74771 Closes #84730 Co-authored-by: Fangrui Song <i@maskray.me>