1 files changed, 3 insertions, 39 deletions
diff --git a/compiler/rustc_codegen_gcc/src/base.rs b/compiler/rustc_codegen_gcc/src/base.rs
index a3b8d328388..8b23e96066e 100644
--- a/compiler/rustc_codegen_gcc/src/base.rs
+++ b/compiler/rustc_codegen_gcc/src/base.rs
@@ -7,14 +7,12 @@ use gccjit::{
     GlobalKind,
 };
 use rustc_middle::dep_graph;
-use rustc_middle::middle::exported_symbols;
 use rustc_middle::ty::TyCtxt;
 use rustc_middle::mir::mono::Linkage;
 use rustc_codegen_ssa::{ModuleCodegen, ModuleKind};
 use rustc_codegen_ssa::base::maybe_create_entry_wrapper;
 use rustc_codegen_ssa::mono_item::MonoItemExt;
 use rustc_codegen_ssa::traits::DebugInfoMethods;
-use rustc_metadata::EncodedMetadata;
 use rustc_session::config::DebugInfo;
 use rustc_span::Symbol;
 
@@ -83,7 +81,10 @@ pub fn compile_codegen_unit<'tcx>(tcx: TyCtxt<'tcx>, cgu_name: Symbol) -> (Modul
         for arg in &tcx.sess.opts.cg.llvm_args {
             context.add_command_line_option(arg);
         }
+        // NOTE: an optimization (https://github.com/rust-lang/rustc_codegen_gcc/issues/53).
         context.add_command_line_option("-fno-semantic-interposition");
+        // NOTE: Rust relies on LLVM not doing TBAA (https://github.com/rust-lang/unsafe-code-guidelines/issues/292).
+        context.add_command_line_option("-fno-strict-aliasing");
         if env::var("CG_GCCJIT_DUMP_CODE").as_deref() == Ok("1") {
             context.set_dump_code_on_compile(true);
         }
@@ -132,40 +133,3 @@ pub fn compile_codegen_unit<'tcx>(tcx: TyCtxt<'tcx>, cgu_name: Symbol) -> (Modul
 
     (module, cost)
 }
-
-pub fn write_compressed_metadata<'tcx>(tcx: TyCtxt<'tcx>, metadata: &EncodedMetadata, gcc_module: &mut GccContext) {
-    use snap::write::FrameEncoder;
-    use std::io::Write;
-
-    // Historical note:
-    //
-    // When using link.exe it was seen that the section name `.note.rustc`
-    // was getting shortened to `.note.ru`, and according to the PE and COFF
-    // specification:
-    //
-    // > Executable images do not use a string table and do not support
-    // > section names longer than 8 characters
-    //
-    // https://docs.microsoft.com/en-us/windows/win32/debug/pe-format
-    //
-    // As a result, we choose a slightly shorter name! As to why
-    // `.note.rustc` works on MinGW, see
-    // https://github.com/llvm/llvm-project/blob/llvmorg-12.0.0/lld/COFF/Writer.cpp#L1190-L1197
-    let section_name = if tcx.sess.target.is_like_osx { "__DATA,.rustc" } else { ".rustc" };
-
-    let context = &gcc_module.context;
-    let mut compressed = rustc_metadata::METADATA_HEADER.to_vec();
-    FrameEncoder::new(&mut compressed).write_all(&metadata.raw_data()).unwrap();
-
-    let name = exported_symbols::metadata_symbol_name(tcx);
-    let typ = context.new_array_type(None, context.new_type::<u8>(), compressed.len() as i32);
-    let global = context.new_global(None, GlobalKind::Exported, typ, name);
-    global.global_set_initializer(&compressed);
-    global.set_link_section(section_name);
-
-    // Also generate a .section directive to force no
-    // flags, at least for ELF outputs, so that the
-    // metadata doesn't get loaded into memory.
-    let directive = format!(".section {}", section_name);
-    context.add_top_level_asm(None, &directive);
-}