Auto merge of #85810 - bjorn3:further_driver_cleanup, r=varkor

Driver improvements

This PR contains a couple of cleanups for the driver and a few small improvements for the custom codegen backend interface. It also implements `--version` and `-Cpasses=list` support for custom codegen backends.

3 files changed, 2 insertions, 21 deletions

diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index f9f59be1e8b..05df7ab5388 100644
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -1957,7 +1957,7 @@ fn add_order_independent_options(
     cmd.output_filename(out_filename);
 
     if crate_type == CrateType::Executable && sess.target.is_like_windows {
-        if let Some(ref s) = codegen_results.windows_subsystem {
+        if let Some(ref s) = codegen_results.crate_info.windows_subsystem {
             cmd.subsystem(s);
         }
     }
diff --git a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
index 14d6f0ba147..b2ecc3b0f32 100644
--- a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
+++ b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
@@ -370,7 +370,6 @@ pub fn provide(providers: &mut Providers) {
 pub fn provide_extern(providers: &mut Providers) {
     providers.is_reachable_non_generic = is_reachable_non_generic_provider_extern;
     providers.upstream_monomorphizations_for = upstream_monomorphizations_for_provider;
-    providers.wasm_import_module_map = wasm_import_module_map;
 }
 
 fn symbol_export_level(tcx: TyCtxt<'_>, sym_def_id: DefId) -> SymbolExportLevel {
diff --git a/compiler/rustc_codegen_ssa/src/back/write.rs b/compiler/rustc_codegen_ssa/src/back/write.rs
index 49774dc6d5c..ff4e6409571 100644
--- a/compiler/rustc_codegen_ssa/src/back/write.rs
+++ b/compiler/rustc_codegen_ssa/src/back/write.rs
@@ -31,7 +31,7 @@ use rustc_session::config::{self, CrateType, Lto, OutputFilenames, OutputType};
 use rustc_session::config::{Passes, SwitchWithOptPath};
 use rustc_session::Session;
 use rustc_span::source_map::SourceMap;
-use rustc_span::symbol::{sym, Symbol};
+use rustc_span::symbol::sym;
 use rustc_span::{BytePos, FileName, InnerSpan, Pos, Span};
 use rustc_target::spec::{MergeFunctions, PanicStrategy, SanitizerSet};
 
@@ -426,21 +426,9 @@ pub fn start_async_codegen<B: ExtraBackendMethods>(
     let (coordinator_send, coordinator_receive) = channel();
     let sess = tcx.sess;
 
-    let crate_name = tcx.crate_name(LOCAL_CRATE);
     let crate_attrs = tcx.hir().attrs(rustc_hir::CRATE_HIR_ID);
     let no_builtins = tcx.sess.contains_name(crate_attrs, sym::no_builtins);
     let is_compiler_builtins = tcx.sess.contains_name(crate_attrs, sym::compiler_builtins);
-    let subsystem = tcx.sess.first_attr_value_str_by_name(crate_attrs, sym::windows_subsystem);
-    let windows_subsystem = subsystem.map(|subsystem| {
-        if subsystem != sym::windows && subsystem != sym::console {
-            tcx.sess.fatal(&format!(
-                "invalid windows subsystem `{}`, only \
-                                     `windows` and `console` are allowed",
-                subsystem
-            ));
-        }
-        subsystem.to_string()
-    });
 
     let linker_info = LinkerInfo::new(tcx, target_cpu);
     let crate_info = CrateInfo::new(tcx);
@@ -472,9 +460,7 @@ pub fn start_async_codegen<B: ExtraBackendMethods>(
 
     OngoingCodegen {
         backend,
-        crate_name,
         metadata,
-        windows_subsystem,
         linker_info,
         crate_info,
 
@@ -1812,9 +1798,7 @@ impl SharedEmitterMain {
 
 pub struct OngoingCodegen<B: ExtraBackendMethods> {
     pub backend: B,
-    pub crate_name: Symbol,
     pub metadata: EncodedMetadata,
-    pub windows_subsystem: Option<String>,
     pub linker_info: LinkerInfo,
     pub crate_info: CrateInfo,
     pub coordinator_send: Sender<Box<dyn Any + Send>>,
@@ -1857,9 +1841,7 @@ impl<B: ExtraBackendMethods> OngoingCodegen<B> {
 
         (
             CodegenResults {
-                crate_name: self.crate_name,
                 metadata: self.metadata,
-                windows_subsystem: self.windows_subsystem,
                 linker_info: self.linker_info,
                 crate_info: self.crate_info,