Strip debuginfo from rustc-main and rustdoc

src/bootstrap/src/core/build_steps/compile.rs

@@ -984,6 +984,7 @@ impl Step for Rustc {
             true, // Only ship rustc_driver.so and .rmeta files, not all intermediate .rlib files.
         );
 
+        let target_root_dir = stamp.parent().unwrap();
         // When building `librustc_driver.so` (like `libLLVM.so`) on linux, it can contain
         // unexpected debuginfo from dependencies, for example from the C++ standard library used in
         // our LLVM wrapper. Unless we're explicitly requesting `librustc_driver` to be built with
@@ -992,11 +993,16 @@ impl Step for Rustc {
         if builder.config.rust_debuginfo_level_rustc == DebuginfoLevel::None
             && builder.config.rust_debuginfo_level_tools == DebuginfoLevel::None
         {
-            let target_root_dir = stamp.parent().unwrap();
             let rustc_driver = target_root_dir.join("librustc_driver.so");
             strip_debug(builder, target, &rustc_driver);
         }
 
+        if builder.config.rust_debuginfo_level_rustc == DebuginfoLevel::None {
+            // Due to LTO a lot of debug info from C++ dependencies such as jemalloc can make it into
+            // our final binaries
+            strip_debug(builder, target, &target_root_dir.join("rustc-main"));
+        }
+
         builder.ensure(RustcLink::from_rustc(
             self,
             builder.compiler(compiler.stage, builder.config.build),

src/bootstrap/src/core/build_steps/tool.rs

@@ -5,7 +5,7 @@ use crate::core::build_steps::toolstate::ToolState;
 use crate::core::build_steps::{compile, llvm};
 use crate::core::builder;
 use crate::core::builder::{Builder, Cargo as CargoCommand, RunConfig, ShouldRun, Step};
-use crate::core::config::TargetSelection;
+use crate::core::config::{DebuginfoLevel, TargetSelection};
 use crate::utils::channel::GitInfo;
 use crate::utils::exec::{BootstrapCommand, command};
 use crate::utils::helpers::{add_dylib_path, exe, t};
@@ -671,6 +671,11 @@ impl Step for Rustdoc {
 
         // don't create a stage0-sysroot/bin directory.
         if target_compiler.stage > 0 {
+            if builder.config.rust_debuginfo_level_tools == DebuginfoLevel::None {
+                // Due to LTO a lot of debug info from C++ dependencies such as jemalloc can make it into
+                // our final binaries
+                compile::strip_debug(builder, target, &tool_rustdoc);
+            }
             let bin_rustdoc = bin_rustdoc();
             builder.copy_link(&tool_rustdoc, &bin_rustdoc);
             bin_rustdoc

src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile

@@ -89,6 +89,7 @@ ENV RUST_CONFIGURE_ARGS \
       --set rust.lto=thin \
       --set rust.codegen-units=1
 
+# Note that `rust.debug` is set to true *only* for `opt-dist`
 ENV SCRIPT python3 ../x.py build --set rust.debug=true opt-dist && \
     ./build/$HOSTS/stage0-tools-bin/opt-dist linux-ci -- python3 ../x.py dist \
     --host $HOSTS --target $HOSTS \