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#[used(linker)] attribute (https://github.com/dtolnay/linkme/issues/41)

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This commit is contained in:
cynecx 2021-11-22 13:14:54 +01:00
parent f624427f87
commit 03733ca65a
8 changed files with 58 additions and 4 deletions
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9
compiler/rustc_codegen_llvm/src/consts.rs
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@ -522,6 +522,9 @@ impl<'ll> StaticMethods for CodegenCx<'ll, '_> {
}
if attrs.flags.contains(CodegenFnAttrFlags::USED) {
// `USED` and `USED_LINKER` can't be used together.
assert!(!attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER));
// The semantics of #[used] in Rust only require the symbol to make it into the
// object file. It is explicitly allowed for the linker to strip the symbol if it
// is dead. As such, use llvm.compiler.used instead of llvm.used.
@ -530,6 +533,12 @@ impl<'ll> StaticMethods for CodegenCx<'ll, '_> {
// in some versions of the gold linker.
self.add_compiler_used_global(g);
}
if attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER) {
// `USED` and `USED_LINKER` can't be used together.
assert!(!attrs.flags.contains(CodegenFnAttrFlags::USED));
self.add_used_global(g);
}
}
}