tree 89864439f5439af9ae8a513202a6395ea9d9be89
parent 8d3ee8a185cf46bca3c4334509b6730d4c907f2f
author Fangrui Song <i@maskray.me> 1710521423 -0700
committer Copybara-Service <copybara-worker@google.com> 1710521490 -0700

[ELF] Reject certain unknown section types (#85173)

Unknown section sections may require special linking rules, and
rejecting such sections for older linkers may be desired. For example,
if we introduce a new section type to replace a control structure (e.g.
relocations), it would be nice for older linkers to reject the new
section type. GNU ld allows certain unknown section types:

* [SHT_LOUSER,SHT_HIUSER] and non-SHF_ALLOC
* [SHT_LOOS,SHT_HIOS] and non-SHF_OS_NONCONFORMING

but reports errors and stops linking for others (unless
--no-warn-mismatch is specified). Port its behavior. For convenience, we
additionally allow all [SHT_LOPROC,SHT_HIPROC] types so that we don't
have to hard code all known types for each processor.

Close https://github.com/llvm/llvm-project/issues/84812

GitOrigin-RevId: e115c00565be88677e8b7fe021a3e242249c67b8