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4 Commits

Author SHA1 Message Date
Rainer Orth 365be7ac72 [MC][ELF] Use SHF_SUNW_NODISCARD instead of SHF_GNU_RETAIN on Solaris 
As requested in D107955 <https://reviews.llvm.org/D107955>, this patch
splits off the `MC` and `CodeGen` parts and adds a testcase.

Tested on `sparcv9-sun-solaris2.11`, `amd64-pc-solaris2.11`, and
`x86_64-pc-linux-gnu`.

Differential Revision: https://reviews.llvm.org/D120318
 2022-02-23 15:43:12 +01:00
Douglas Yung 6a7a208357 Add requirement for aarch64-registered-target to test change added in 42e3f97a9d. 2021-03-09 12:26:15 -08:00
Fangrui Song 42e3f97a9d [MC] Change ELFOSABI_NONE to ELFOSABI_GNU for SHF_GNU_RETAIN 
GNU ld does not give SHF_GNU_RETAIN GC root semantics for ELFOSABI_NONE.
(https://sourceware.org/pipermail/binutils/2021-March/115581.html)

This allows GNU ld to interpret SHF_GNU_RETAIN and avoids a gold quirk
https://sourceware.org/bugzilla/show_bug.cgi?id=27490

Because ELFObjectWriter is in an anonymous namespace, I have to place
`markGnuAbi` in the parent MCObjectWriter.

Differential Revision: https://reviews.llvm.org/D97976
 2021-03-09 09:59:47 -08:00
Fangrui Song 1477ed8465 [MC] Support SHF_GNU_RETAIN as section flag 'R' 
On Linux target triples, GNU as sets EI_OSABI to ELFOSABI_GNU when SHF_GNU_RETAIN is used。
On `*-*-freebsd`, it usually sets EI_OSABI to ELFOSABI_FREEBSD.

GNU ld respects SHF_GNU_RETAIN only for ELFOSABI_FREEBSD/ELFOSABI_GNU.
https://sourceware.org/bugzilla/show_bug.cgi?id=27282

MC doesn't set ELFOSABI_GNU for SHF_GNU_RETAIN/STB_GNU_UNIQUE/STT_GNU_IFUNC.
MC assembled object files do not have special semantics in GNU ld.

Reviewed By: psmith

Differential Revision: https://reviews.llvm.org/D95730
 2021-02-02 09:34:09 -08:00