-Zembed-source: Don't try to warn about incompatible codegen backends

Author: Mrmaxmeier

compiler/rustc_session/messages.ftl

@@ -18,8 +18,6 @@ session_embed_source_insufficient_dwarf_version = `-Zembed-source=y` requires at
 
 session_embed_source_requires_debug_info = `-Zembed-source=y` requires debug information to be enabled
 
-session_embed_source_requires_llvm_backend = `-Zembed-source=y` is only supported on the LLVM codegen backend
-
 session_expr_parentheses_needed = parentheses are required to parse this as an expression
 
 session_failed_to_create_profiler = failed to create profiler: {$err}

compiler/rustc_session/src/errors.rs

@@ -175,10 +175,6 @@ pub(crate) struct EmbedSourceInsufficientDwarfVersion {
 #[diag(session_embed_source_requires_debug_info)]
 pub(crate) struct EmbedSourceRequiresDebugInfo;
 
-#[derive(Diagnostic)]
-#[diag(session_embed_source_requires_llvm_backend)]
-pub(crate) struct EmbedSourceRequiresLLVMBackend;
-
 #[derive(Diagnostic)]
 #[diag(session_target_stack_protector_not_supported)]
 pub(crate) struct StackProtectorNotSupportedForTarget<'a> {

compiler/rustc_session/src/session.rs

@@ -1305,20 +1305,13 @@ fn validate_commandline_args_with_session_available(sess: &Session) {
         let dwarf_version =
             sess.opts.unstable_opts.dwarf_version.unwrap_or(sess.target.default_dwarf_version);
 
-        let uses_llvm_backend =
-            matches!(sess.opts.unstable_opts.codegen_backend.as_deref(), None | Some("llvm"));
-
         if dwarf_version < 5 {
             sess.dcx().emit_warn(errors::EmbedSourceInsufficientDwarfVersion { dwarf_version });
         }
 
         if sess.opts.debuginfo == DebugInfo::None {
             sess.dcx().emit_warn(errors::EmbedSourceRequiresDebugInfo);
         }
-
-        if !uses_llvm_backend {
-            sess.dcx().emit_warn(errors::EmbedSourceRequiresLLVMBackend);
-        }
     }
 
     if sess.opts.unstable_opts.instrument_xray.is_some() && !sess.target.options.supports_xray {