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Rollup merge of #92029 - nikic:section-flags-fix, r=davidtwco

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Explicitly set no ELF flags for .rustc section

For a data section, the object crate will set the SHF_ALLOC by default, which is exactly what we don't want. Explicitly set sh_flags to zero to avoid this.

I checked with `objdump -h` that this produces the right flags for ELF.

Fixes #92013.
This commit is contained in:
Matthias Krüger 2021-12-19 17:38:35 +01:00 committed by GitHub
commit 9415c67ae5
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1 changed files with 8 additions and 1 deletions
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9
compiler/rustc_codegen_ssa/src/back/metadata.rs
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@ -259,8 +259,15 @@ pub fn create_compressed_metadata_file(
let section = file.add_section(
file.segment_name(StandardSegment::Data).to_vec(),
b".rustc".to_vec(),
SectionKind::Data,
SectionKind::ReadOnlyData,
);
match file.format() {
BinaryFormat::Elf => {
// Explicitly set no flags to avoid SHF_ALLOC default for data section.
file.section_mut(section).flags = SectionFlags::Elf { sh_flags: 0 };
}
_ => {}
};
let offset = file.append_section_data(section, &compressed, 1);
// For MachO and probably PE this is necessary to prevent the linker from throwing away the