Beta next

configure

@@ -647,6 +647,7 @@ opt_nosave debug-assertions 0 "build with debugging assertions"
 opt_nosave llvm-release-debuginfo 0 "build LLVM with debugger metadata"
 opt_nosave debuginfo 0 "build with debugger metadata"
 opt_nosave debuginfo-lines 0 "build with line number debugger metadata"
+opt_nosave debuginfo-only-std 0 "build only libstd with debugging information"
 opt_nosave debug-jemalloc 0 "build jemalloc with --enable-debug --enable-fill"
 
 valopt localstatedir "/var/lib" "local state directory"
@@ -732,23 +733,26 @@ case "$CFG_RELEASE_CHANNEL" in
     nightly )
 	msg "overriding settings for $CFG_RELEASE_CHANNEL"
 	CFG_ENABLE_LLVM_ASSERTIONS=1
-
-        # FIXME(#37364) shouldn't have to disable this on windows-gnu
+        # FIXME(stage0) re-enable this on the next stage0 now that #35566 is
+        # fixed
         case "$CFG_BUILD" in
           *-pc-windows-gnu)
             ;;
           *)
-	    CFG_ENABLE_DEBUGINFO_LINES=1
+            CFG_ENABLE_DEBUGINFO_LINES=1
+            CFG_ENABLE_DEBUGINFO_ONLY_STD=1
             ;;
         esac
+
 	;;
     beta | stable)
 	msg "overriding settings for $CFG_RELEASE_CHANNEL"
         case "$CFG_BUILD" in
           *-pc-windows-gnu)
             ;;
           *)
-	    CFG_ENABLE_DEBUGINFO_LINES=1
+            CFG_ENABLE_DEBUGINFO_LINES=1
+            CFG_ENABLE_DEBUGINFO_ONLY_STD=1
             ;;
         esac
 	;;
@@ -784,6 +788,7 @@ if [ -n "$CFG_ENABLE_DEBUG_ASSERTIONS" ]; then putvar CFG_ENABLE_DEBUG_ASSERTION
 if [ -n "$CFG_ENABLE_LLVM_RELEASE_DEBUGINFO" ]; then putvar CFG_ENABLE_LLVM_RELEASE_DEBUGINFO; fi
 if [ -n "$CFG_ENABLE_DEBUGINFO" ]; then putvar CFG_ENABLE_DEBUGINFO; fi
 if [ -n "$CFG_ENABLE_DEBUGINFO_LINES" ]; then putvar CFG_ENABLE_DEBUGINFO_LINES; fi
+if [ -n "$CFG_ENABLE_DEBUGINFO_ONLY_STD" ]; then putvar CFG_ENABLE_DEBUGINFO_ONLY_STD; fi
 if [ -n "$CFG_ENABLE_DEBUG_JEMALLOC" ]; then putvar CFG_ENABLE_DEBUG_JEMALLOC; fi
 
 step_msg "looking for build programs"

src/bootstrap/compile.rs

@@ -190,6 +190,13 @@ pub fn rustc<'a>(build: &'a Build, target: &str, compiler: &Compiler<'a>) {
          .env("CFG_PREFIX", build.config.prefix.clone().unwrap_or(String::new()))
          .env("CFG_LIBDIR_RELATIVE", "lib");
 
+    // If we're not building a compiler with debugging information then remove
+    // these two env vars which would be set otherwise.
+    if build.config.rust_debuginfo_only_std {
+        cargo.env_remove("RUSTC_DEBUGINFO");
+        cargo.env_remove("RUSTC_DEBUGINFO_LINES");
+    }
+
     if let Some(ref ver_date) = build.ver_date {
         cargo.env("CFG_VER_DATE", ver_date);
     }

src/bootstrap/config.rs

@@ -61,6 +61,7 @@ pub struct Config {
     pub rust_debug_assertions: bool,
     pub rust_debuginfo: bool,
     pub rust_debuginfo_lines: bool,
+    pub rust_debuginfo_only_std: bool,
     pub rust_rpath: bool,
     pub rustc_default_linker: Option<String>,
     pub rustc_default_ar: Option<String>,
@@ -167,6 +168,7 @@ struct Rust {
     debug_assertions: Option<bool>,
     debuginfo: Option<bool>,
     debuginfo_lines: Option<bool>,
+    debuginfo_only_std: Option<bool>,
     debug_jemalloc: Option<bool>,
     use_jemalloc: Option<bool>,
     backtrace: Option<bool>,
@@ -279,6 +281,7 @@ impl Config {
             set(&mut config.rust_debug_assertions, rust.debug_assertions);
             set(&mut config.rust_debuginfo, rust.debuginfo);
             set(&mut config.rust_debuginfo_lines, rust.debuginfo_lines);
+            set(&mut config.rust_debuginfo_only_std, rust.debuginfo_only_std);
             set(&mut config.rust_optimize, rust.optimize);
             set(&mut config.rust_optimize_tests, rust.optimize_tests);
             set(&mut config.rust_debuginfo_tests, rust.debuginfo_tests);
@@ -371,6 +374,7 @@ impl Config {
                 ("DEBUG_ASSERTIONS", self.rust_debug_assertions),
                 ("DEBUGINFO", self.rust_debuginfo),
                 ("DEBUGINFO_LINES", self.rust_debuginfo_lines),
+                ("DEBUGINFO_ONLY_STD", self.rust_debuginfo_only_std),
                 ("JEMALLOC", self.use_jemalloc),
                 ("DEBUG_JEMALLOC", self.debug_jemalloc),
                 ("RPATH", self.rust_rpath),

src/bootstrap/config.toml.example

@@ -123,6 +123,11 @@
 # Whether or not line number debug information is emitted
 #debuginfo-lines = false
 
+# Whether or not to only build debuginfo for the standard library if enabled.
+# If enabled, this will not compile the compiler with debuginfo, just the
+# standard library.
+#debuginfo-only-std = false
+
 # Whether or not jemalloc is built and enabled
 #use-jemalloc = true
 

src/librustc_mir/transform/promote_consts.rs

@@ -238,7 +238,7 @@ impl<'a, 'tcx> Promoter<'a, 'tcx> {
             self.visit_rvalue(&mut rvalue, loc);
             self.assign(new_temp, rvalue, source_info.span);
         } else {
-            let mut terminator = if self.keep_original {
+            let terminator = if self.keep_original {
                 self.source[loc.block].terminator().clone()
             } else {
                 let terminator = self.source[loc.block].terminator_mut();
@@ -256,28 +256,30 @@ impl<'a, 'tcx> Promoter<'a, 'tcx> {
                 }
             };
 
-            let last = self.promoted.basic_blocks().last().unwrap();
-            let new_target = self.new_block();
-
-            terminator.kind = match terminator.kind {
+            match terminator.kind {
                 TerminatorKind::Call { mut func, mut args, .. } => {
                     self.visit_operand(&mut func, loc);
                     for arg in &mut args {
                         self.visit_operand(arg, loc);
                     }
-                    TerminatorKind::Call {
-                        func: func,
-                        args: args,
-                        cleanup: None,
-                        destination: Some((Lvalue::Local(new_temp), new_target))
-                    }
+
+                    let last = self.promoted.basic_blocks().last().unwrap();
+                    let new_target = self.new_block();
+
+                    *self.promoted[last].terminator_mut() = Terminator {
+                        kind: TerminatorKind::Call {
+                            func: func,
+                            args: args,
+                            cleanup: None,
+                            destination: Some((Lvalue::Local(new_temp), new_target))
+                        },
+                        ..terminator
+                    };
                 }
                 ref kind => {
                     span_bug!(terminator.source_info.span, "{:?} not promotable", kind);
                 }
             };
-
-            *self.promoted[last].terminator_mut() = terminator;
         };
 
         self.keep_original = old_keep_original;

src/librustc_resolve/build_reduced_graph.rs

@@ -135,7 +135,7 @@ impl<'b> Resolver<'b> {
                 let is_prelude = attr::contains_name(&item.attrs, "prelude_import");
 
                 match view_path.node {
-                    ViewPathSimple(binding, ref full_path) => {
+                    ViewPathSimple(mut binding, ref full_path) => {
                         let mut source = full_path.segments.last().unwrap().identifier;
                         let source_name = source.name;
                         if source_name == "mod" || source_name == "self" {
@@ -149,6 +149,9 @@ impl<'b> Resolver<'b> {
                                 ModuleKind::Block(..) => unreachable!(),
                             };
                             source.name = crate_name;
+                            if binding.name == "$crate" {
+                                binding.name = crate_name;
+                            }
 
                             self.session.struct_span_warn(item.span, "`$crate` may not be imported")
                                 .note("`use $crate;` was erroneously allowed and \

src/test/compile-fail/auxiliary/import_crate_var.rs

@@ -8,5 +8,10 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+pub fn f() {}
+
 #[macro_export]
-macro_rules! m { () => { use $crate; } }
+macro_rules! m { () => {
+    use $crate;
+    import_crate_var::f();
+} }

src/test/compile-fail/import-crate-var.rs

@@ -11,11 +11,13 @@
 // aux-build:import_crate_var.rs
 // error-pattern: `$crate` may not be imported
 // error-pattern: `use $crate;` was erroneously allowed and will become a hard error
+// error-pattern: compilation successful
 
 #![feature(rustc_attrs)]
 
 #[macro_use] extern crate import_crate_var;
-m!();
 
 #[rustc_error]
-fn main() {}
+fn main() {
+    m!();
+}

src/test/run-pass/issue-37991.rs

@@ -14,7 +14,14 @@ const fn foo() -> i64 {
     3
 }
 
+const fn bar(x: i64) -> i64 {
+    x*2
+}
+
 fn main() {
     let val = &(foo() % 2);
     assert_eq!(*val, 1);
+
+    let val2 = &(bar(1+1) % 3);
+    assert_eq!(*val2, 1);
 }