Add @feat.00 symbol to symbols.o for COFF

This commit is contained in:
Gary Guo 2022-04-28 16:22:40 +01:00
parent 4f9acb2687
commit 0fce0db96f
3 changed files with 35 additions and 0 deletions

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@ -1700,6 +1700,29 @@ fn add_linked_symbol_object(
// We handle the name decoration of COFF targets in `symbol_export.rs`, so disable the
// default mangler in `object` crate.
file.set_mangling(object::write::Mangling::None);
// Add feature flags to the object file. On MSVC this is optional but LLD will complain if
// not present.
let mut feature = 0;
if file.architecture() == object::Architecture::I386 {
// Indicate that all SEH handlers are registered in .sxdata section.
// We don't have generate any code, so we don't need .sxdata section but LLD still
// expects us to set this bit (see #96498).
// Reference: https://docs.microsoft.com/en-us/windows/win32/debug/pe-format
feature |= 1;
}
file.add_symbol(object::write::Symbol {
name: "@feat.00".into(),
value: feature,
size: 0,
kind: object::SymbolKind::Data,
scope: object::SymbolScope::Compilation,
weak: false,
section: object::write::SymbolSection::Absolute,
flags: object::SymbolFlags::None,
});
}
for (sym, kind) in symbols.iter() {

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@ -0,0 +1,8 @@
# only-windows
# needs-rust-lld
-include ../../run-make-fulldeps/tools.mk
# Ensure that LLD can link
all:
$(RUSTC) -C linker=rust-lld foo.rs

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@ -0,0 +1,4 @@
#![crate_type = "cdylib"]
#[no_mangle]
extern "C" fn foo() {}