bootstrap/codegen_ssa: ship llvm-strip and use it for -Cstrip

compiler/rustc_codegen_ssa/messages.ftl

@@ -2,6 +2,8 @@ codegen_ssa_L4Bender_exporting_symbols_unimplemented = exporting symbols not imp
 
 codegen_ssa_add_native_library = failed to add native library {$library_path}: {$error}
 
+codegen_ssa_aix_strip_not_used = using host's `strip` binary to cross-compile to AIX which is not guaranteed to work
+
 codegen_ssa_apple_deployment_target_invalid =
     failed to parse deployment target specified in {$env_var}: {$error}
 

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -1085,9 +1085,7 @@ fn link_natively(
     let strip = sess.opts.cg.strip;
 
     if sess.target.is_like_osx {
-        // Use system `strip` when running on host macOS.
-        // <https://github.com/rust-lang/rust/pull/130781>
-        let stripcmd = if cfg!(target_os = "macos") { "/usr/bin/strip" } else { "strip" };
+        let stripcmd = "rust-objcopy";
         match (strip, crate_type) {
             (Strip::Debuginfo, _) => {
                 strip_symbols_with_external_utility(sess, stripcmd, out_filename, Some("-S"))
@@ -1103,11 +1101,14 @@ fn link_natively(
         }
     }
 
-    if sess.target.os == "illumos" {
+    if sess.target.is_like_solaris {
         // Many illumos systems will have both the native 'strip' utility and
         // the GNU one. Use the native version explicitly and do not rely on
         // what's in the path.
-        let stripcmd = "/usr/bin/strip";
+        //
+        // If cross-compiling and there is not a native version, then use
+        // `llvm-strip` and hope.
+        let stripcmd = if !sess.host.is_like_solaris { "rust-objcopy" } else { "/usr/bin/strip" };
         match strip {
             // Always preserve the symbol table (-x).
             Strip::Debuginfo => {
@@ -1120,6 +1121,10 @@ fn link_natively(
     }
 
     if sess.target.is_like_aix {
+        // `llvm-strip` doesn't work for AIX - their strip must be used.
+        if !sess.host.is_like_aix {
+            sess.dcx().emit_warn(errors::AixStripNotUsed);
+        }
         let stripcmd = "/usr/bin/strip";
         match strip {
             Strip::Debuginfo => {
@@ -1147,6 +1152,13 @@ fn strip_symbols_with_external_utility(
     if let Some(option) = option {
         cmd.arg(option);
     }
+
+    let mut new_path = sess.get_tools_search_paths(false);
+    if let Some(path) = env::var_os("PATH") {
+        new_path.extend(env::split_paths(&path));
+    }
+    cmd.env("PATH", env::join_paths(new_path).unwrap());
+
     let prog = cmd.arg(out_filename).output();
     match prog {
         Ok(prog) => {

compiler/rustc_codegen_ssa/src/errors.rs

@@ -1101,3 +1101,7 @@ impl<G: EmissionGuarantee> Diagnostic<'_, G> for TargetFeatureDisableOrEnable<'_
         diag
     }
 }
+
+#[derive(Diagnostic)]
+#[diag(codegen_ssa_aix_strip_not_used)]
+pub(crate) struct AixStripNotUsed;

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

@@ -219,8 +219,7 @@ impl Step for Std {
                 .join(compiler.host)
                 .join("bin");
             if src_sysroot_bin.exists() {
-                let target_sysroot_bin =
-                    builder.sysroot_target_libdir(compiler, target).parent().unwrap().join("bin");
+                let target_sysroot_bin = builder.sysroot_target_bindir(compiler, target);
                 t!(fs::create_dir_all(&target_sysroot_bin));
                 builder.cp_link_r(&src_sysroot_bin, &target_sysroot_bin);
             }
@@ -1977,6 +1976,14 @@ impl Step for Assemble {
             }
         }
 
+        {
+            // `llvm-strip` is used by rustc, which is actually just a symlink to `llvm-objcopy`,
+            // so copy and rename `llvm-objcopy`.
+            let src_exe = exe("llvm-objcopy", target_compiler.host);
+            let dst_exe = exe("rust-objcopy", target_compiler.host);
+            builder.copy_link(&libdir_bin.join(src_exe), &libdir_bin.join(dst_exe));
+        }
+
         // In addition to `rust-lld` also install `wasm-component-ld` when
         // LLD is enabled. This is a relatively small binary that primarily
         // delegates to the `rust-lld` binary for linking and then runs

src/bootstrap/src/core/build_steps/dist.rs

@@ -459,8 +459,7 @@ impl Step for Rustc {
 
             // Copy over lld if it's there
             if builder.config.lld_enabled {
-                let src_dir =
-                    builder.sysroot_target_libdir(compiler, host).parent().unwrap().join("bin");
+                let src_dir = builder.sysroot_target_bindir(compiler, host);
                 let rust_lld = exe("rust-lld", compiler.host);
                 builder.copy_link(&src_dir.join(&rust_lld), &dst_dir.join(&rust_lld));
                 let self_contained_lld_src_dir = src_dir.join("gcc-ld");
@@ -474,9 +473,16 @@ impl Step for Rustc {
                     );
                 }
             }
+
+            {
+                let src_dir = builder.sysroot_target_bindir(compiler, host);
+                let llvm_objcopy = exe("llvm-objcopy", compiler.host);
+                let rust_objcopy = exe("rust-objcopy", compiler.host);
+                builder.copy_link(&src_dir.join(&llvm_objcopy), &dst_dir.join(&rust_objcopy));
+            }
+
             if builder.tool_enabled("wasm-component-ld") {
-                let src_dir =
-                    builder.sysroot_target_libdir(compiler, host).parent().unwrap().join("bin");
+                let src_dir = builder.sysroot_target_bindir(compiler, host);
                 let ld = exe("wasm-component-ld", compiler.host);
                 builder.copy_link(&src_dir.join(&ld), &dst_dir.join(&ld));
             }

src/bootstrap/src/core/builder/mod.rs

@@ -1161,6 +1161,11 @@ impl<'a> Builder<'a> {
         self.ensure(compile::Sysroot::new(compiler))
     }
 
+    /// Returns the bindir for a compiler's sysroot.
+    pub fn sysroot_target_bindir(&self, compiler: Compiler, target: TargetSelection) -> PathBuf {
+        self.sysroot_target_libdir(compiler, target).parent().unwrap().join("bin")
+    }
+
     /// Returns the libdir where the standard library and other artifacts are
     /// found for a compiler's sysroot.
     pub fn sysroot_target_libdir(&self, compiler: Compiler, target: TargetSelection) -> PathBuf {