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Default relax_elf_relocations to true

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This option tells LLVM to emit relaxable relocation types
R_X86_64_GOTPCRELX/R_X86_64_REX_GOTPCRELX/R_386_GOT32X in applicable cases. True
matches Clang's CMake default since 2020-08 [1] and latest LLVM default[2].

This also works around a GNU ld<2.41 issue[3] when using
general-dynamic/local-dynamic TLS models in `-Z plt=no` mode with latest LLVM.

[1]: c41a18cf61
[2]: 2aedfdd9b8
[3]: https://sourceware.org/bugzilla/show_bug.cgi?id=24784
This commit is contained in:
Fangrui Song 2023-01-05 13:55:24 -08:00
parent 8e8231f64e
commit f3d81917fc
3 changed files with 2 additions and 3 deletions
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2
compiler/rustc_interface/src/tests.rs
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@ -821,7 +821,7 @@ macro_rules! tracked {
tracked!(profile_emit, Some(PathBuf::from("abc")));
tracked!(profile_sample_use, Some(PathBuf::from("abc")));
tracked!(profiler_runtime, "abc".to_string());
tracked!(relax_elf_relocations, Some(true));
tracked!(relax_elf_relocations, Some(false));
tracked!(relro_level, Some(RelroLevel::Full));
tracked!(remap_cwd_prefix, Some(PathBuf::from("abc")));
tracked!(report_delayed_bugs, true);

2
compiler/rustc_target/src/spec/mod.rs
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@ -2216,7 +2216,7 @@ fn default() -> TargetOptions {
mcount: "mcount".into(),
llvm_mcount_intrinsic: None,
llvm_abiname: "".into(),
relax_elf_relocations: false,
relax_elf_relocations: true,
llvm_args: cvs![],
use_ctors_section: false,
eh_frame_header: true,

1
compiler/rustc_target/src/spec/x86_64_fortanix_unknown_sgx.rs
View File

@ -69,7 +69,6 @@ pub fn target() -> Target {
position_independent_executables: true,
pre_link_args,
override_export_symbols: Some(EXPORT_SYMBOLS.iter().cloned().map(Cow::from).collect()),
relax_elf_relocations: true,
..Default::default()
};
Target {