Rollup merge of rust-lang#96523 - nbdd0121:windows, r=petrochenkov

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

Fix rust-lang#96498

This is based on top of rust-lang#96444.

r? ``@petrochenkov``

Author: Dylan-DPC

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -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() {

src/test/run-make/issue-96498/Makefile

@@ -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

src/test/run-make/issue-96498/foo.rs

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