Disable strict aliasing (rust-lang#104)

antoyo · web-flow · commit 1d064f174164 · 2021-10-25T17:48:15.000-04:00
diff --git a/src/base.rs b/src/base.rs
@@ -77,7 +77,10 @@ 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);
         }

Original file line number	Diff line number	Diff line change
`@@ -77,7 +77,10 @@ pub fn compile_codegen_unit<'tcx>(tcx: TyCtxt<'tcx>, cgu_name: Symbol) -> (Modul`
`77`	`77`	`for arg in &tcx.sess.opts.cg.llvm_args {`
`78`	`78`	`context.add_command_line_option(arg);`
`79`	`79`	`}`
	`80`	`+ // NOTE: an optimization (https://github.com/rust-lang/rustc_codegen_gcc/issues/53).`
`80`	`81`	`context.add_command_line_option("-fno-semantic-interposition");`
	`82`	`+ // NOTE: Rust relies on LLVM not doing TBAA (https://github.com/rust-lang/unsafe-code-guidelines/issues/292).`
	`83`	`+ context.add_command_line_option("-fno-strict-aliasing");`
`81`	`84`	`if env::var("CG_GCCJIT_DUMP_CODE").as_deref() == Ok("1") {`
`82`	`85`	`context.set_dump_code_on_compile(true);`
`83`	`86`	`}`