Add rustc SHA to released DWARF debuginfo

This commit updates the debuginfo that is encoded in all of our released
artifacts by default. Currently it has paths like `/checkout/src/...` but these
are a little inconsistent and have changed over time. This commit instead
attempts to actually define the file paths in our debuginfo to be consistent
between releases.

All debuginfo paths are now intended to be `/rustc/$sha` where `$sha` is the git
sha of the released compiler. Sub-paths are all paths into the git repo at that
`$sha`.

config.toml.example

@@ -373,6 +373,10 @@
 # Whether to verify generated LLVM IR
 #verify-llvm-ir = false
 
+# Map all debuginfo paths for libstd and crates to `/rust/$sha/$crate/...`,
+# generally only set for releases
+#remap-debuginfo = false
+
 # =============================================================================
 # Options for specific targets
 #

src/bootstrap/bin/rustc.rs

@@ -263,6 +263,10 @@ fn main() {
         if env::var_os("RUSTC_FORCE_UNSTABLE").is_some() {
             cmd.arg("-Z").arg("force-unstable-if-unmarked");
         }
+
+        if let Ok(map) = env::var("RUSTC_DEBUGINFO_MAP") {
+            cmd.arg("--remap-path-prefix").arg(&map);
+        }
     } else {
         // Override linker if necessary.
         if let Ok(host_linker) = env::var("RUSTC_HOST_LINKER") {

src/bootstrap/builder.rs

@@ -32,7 +32,7 @@ use native;
 use test;
 use tool;
 use util::{add_lib_path, exe, libdir};
-use {Build, DocTests, Mode};
+use {Build, DocTests, Mode, GitRepo};
 
 pub use Compiler;
 
@@ -876,6 +876,10 @@ impl<'a> Builder<'a> {
             cargo.env("RUSTC_HOST_CRT_STATIC", x.to_string());
         }
 
+        if let Some(map) = self.build.debuginfo_map(GitRepo::Rustc) {
+            cargo.env("RUSTC_DEBUGINFO_MAP", map);
+        }
+
         // Enable usage of unstable features
         cargo.env("RUSTC_BOOTSTRAP", "1");
         self.add_rust_test_threads(&mut cargo);
@@ -964,7 +968,7 @@ impl<'a> Builder<'a> {
             let cc = ccacheify(&self.cc(target));
             cargo.env(format!("CC_{}", target), &cc).env("CC", &cc);
 
-            let cflags = self.cflags(target).join(" ");
+            let cflags = self.cflags(target, GitRepo::Rustc).join(" ");
             cargo
                 .env(format!("CFLAGS_{}", target), cflags.clone())
                 .env("CFLAGS", cflags.clone());

src/bootstrap/cc_detect.rs

@@ -39,7 +39,7 @@ use std::process::Command;
 use build_helper::output;
 use cc;
 
-use Build;
+use {Build, GitRepo};
 use config::Target;
 use cache::Interned;
 
@@ -107,7 +107,7 @@ pub fn find(build: &mut Build) {
 
         build.cc.insert(target, compiler);
         build.verbose(&format!("CC_{} = {:?}", &target, build.cc(target)));
-        build.verbose(&format!("CFLAGS_{} = {:?}", &target, build.cflags(target)));
+        build.verbose(&format!("CFLAGS_{} = {:?}", &target, build.cflags(target, GitRepo::Rustc)));
         if let Some(ar) = ar {
             build.verbose(&format!("AR_{} = {:?}", &target, ar));
             build.ar.insert(target, ar);

src/bootstrap/compile.rs

@@ -30,7 +30,7 @@ use filetime::FileTime;
 use serde_json;
 
 use util::{exe, libdir, is_dylib, CiEnv};
-use {Compiler, Mode};
+use {Compiler, Mode, GitRepo};
 use native;
 use tool;
 
@@ -895,7 +895,7 @@ pub fn compiler_file(builder: &Builder,
                  target: Interned<String>,
                  file: &str) -> PathBuf {
     let mut cmd = Command::new(compiler);
-    cmd.args(builder.cflags(target));
+    cmd.args(builder.cflags(target, GitRepo::Rustc));
     cmd.arg(format!("-print-file-name={}", file));
     let out = output(&mut cmd);
     PathBuf::from(out.trim())

src/bootstrap/config.rs

@@ -108,6 +108,7 @@ pub struct Config {
     pub rust_codegen_backends: Vec<Interned<String>>,
     pub rust_codegen_backends_dir: String,
     pub rust_verify_llvm_ir: bool,
+    pub rust_remap_debuginfo: bool,
 
     pub build: Interned<String>,
     pub hosts: Vec<Interned<String>>,
@@ -319,6 +320,7 @@ struct Rust {
     deny_warnings: Option<bool>,
     backtrace_on_ice: Option<bool>,
     verify_llvm_ir: Option<bool>,
+    remap_debuginfo: Option<bool>,
 }
 
 /// TOML representation of how each build target is configured.
@@ -554,6 +556,7 @@ impl Config {
             set(&mut config.deny_warnings, rust.deny_warnings.or(flags.warnings));
             set(&mut config.backtrace_on_ice, rust.backtrace_on_ice);
             set(&mut config.rust_verify_llvm_ir, rust.verify_llvm_ir);
+            set(&mut config.rust_remap_debuginfo, rust.remap_debuginfo);
 
             if let Some(ref backends) = rust.codegen_backends {
                 config.rust_codegen_backends = backends.iter()

src/bootstrap/lib.rs

@@ -237,6 +237,11 @@ pub enum DocTests {
     Only,
 }
 
+pub enum GitRepo {
+    Rustc,
+    Llvm,
+}
+
 /// Global configuration for the build system.
 ///
 /// This structure transitively contains all configuration for the build system.
@@ -738,6 +743,21 @@ impl Build {
         self.config.jobs.unwrap_or_else(|| num_cpus::get() as u32)
     }
 
+    fn debuginfo_map(&self, which: GitRepo) -> Option<String> {
+        if !self.config.rust_remap_debuginfo {
+            return None
+        }
+
+        let path = match which {
+            GitRepo::Rustc => {
+                let sha = self.rust_info.sha().expect("failed to find sha");
+                format!("/rustc/{}", sha)
+            }
+            GitRepo::Llvm => format!("/rustc/llvm"),
+        };
+        Some(format!("{}={}", self.src.display(), path))
+    }
+
     /// Returns the path to the C compiler for the target specified.
     fn cc(&self, target: Interned<String>) -> &Path {
         self.cc[&target].path()
@@ -745,7 +765,7 @@ impl Build {
 
     /// Returns a list of flags to pass to the C compiler for the target
     /// specified.
-    fn cflags(&self, target: Interned<String>) -> Vec<String> {
+    fn cflags(&self, target: Interned<String>, which: GitRepo) -> Vec<String> {
         // Filter out -O and /O (the optimization flags) that we picked up from
         // cc-rs because the build scripts will determine that for themselves.
         let mut base = self.cc[&target].args().iter()
@@ -767,6 +787,16 @@ impl Build {
         if &*target == "i686-pc-windows-gnu" {
             base.push("-fno-omit-frame-pointer".into());
         }
+
+        if let Some(map) = self.debuginfo_map(which) {
+        let cc = self.cc(target);
+            if cc.ends_with("clang") || cc.ends_with("gcc") {
+                base.push(format!("-fdebug-prefix-map={}", map).into());
+            } else if cc.ends_with("clang-cl.exe") {
+                base.push("-Xclang".into());
+                base.push(format!("-fdebug-prefix-map={}", map).into());
+            }
+        }
         base
     }
 

src/bootstrap/native.rs

@@ -33,6 +33,7 @@ use util::{self, exe};
 use build_helper::up_to_date;
 use builder::{Builder, RunConfig, ShouldRun, Step};
 use cache::Interned;
+use GitRepo;
 
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct Llvm {
@@ -369,8 +370,8 @@ fn configure_cmake(builder: &Builder,
     }
 
     cfg.build_arg("-j").build_arg(builder.jobs().to_string());
-    cfg.define("CMAKE_C_FLAGS", builder.cflags(target).join(" "));
-    let mut cxxflags = builder.cflags(target).join(" ");
+    cfg.define("CMAKE_C_FLAGS", builder.cflags(target, GitRepo::Llvm).join(" "));
+    let mut cxxflags = builder.cflags(target, GitRepo::Llvm).join(" ");
     if building_dist_binaries {
         if builder.config.llvm_static_stdcpp && !target.contains("windows") {
             cxxflags.push_str(" -static-libstdc++");
@@ -676,7 +677,7 @@ impl Step for Openssl {
         };
         configure.arg(os);
         configure.env("CC", builder.cc(target));
-        for flag in builder.cflags(target) {
+        for flag in builder.cflags(target, GitRepo::Rustc) {
             configure.arg(flag);
         }
         // There is no specific os target for android aarch64 or x86_64,

src/bootstrap/test.rs

@@ -34,7 +34,7 @@ use tool::{self, Tool, SourceType};
 use toolstate::ToolState;
 use util::{self, dylib_path, dylib_path_var};
 use Crate as CargoCrate;
-use {DocTests, Mode};
+use {DocTests, Mode, GitRepo};
 
 const ADB_TEST_DIR: &str = "/data/tmp/work";
 
@@ -1140,7 +1140,7 @@ impl Step for Compiletest {
                     .arg("--cxx")
                     .arg(builder.cxx(target).unwrap())
                     .arg("--cflags")
-                    .arg(builder.cflags(target).join(" "))
+                    .arg(builder.cflags(target, GitRepo::Rustc).join(" "))
                     .arg("--llvm-components")
                     .arg(llvm_components.trim())
                     .arg("--llvm-cxxflags")

src/ci/run.sh

@@ -55,6 +55,7 @@ export RUST_RELEASE_CHANNEL=nightly
 if [ "$DEPLOY$DEPLOY_ALT" != "" ]; then
   RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --release-channel=$RUST_RELEASE_CHANNEL"
   RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --enable-llvm-static-stdcpp"
+  RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.remap-debuginfo"
 
   if [ "$NO_LLVM_ASSERTIONS" = "1" ]; then
     RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --disable-llvm-assertions"

src/libstd/build.rs

@@ -97,6 +97,10 @@ fn build_libbacktrace(target: &str) -> Result<(), ()> {
         .file("../libbacktrace/sort.c")
         .file("../libbacktrace/state.c");
 
+    let any_debug = env::var("RUSTC_DEBUGINFO").unwrap_or(String::new()) == "true" ||
+        env::var("RUSTC_DEBUGINFO_LINES").unwrap_or(String::new()) == "true";
+    build.debug(any_debug);
+
     if target.contains("darwin") {
         build.file("../libbacktrace/macho.c");
     } else if target.contains("windows") {

src/test/ui/consts/const-size_of-cycle.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-musl
+// ignore-x86
 // error-pattern: cycle detected
 
 struct Foo {

src/test/ui/impl-trait/impl-generic-mismatch.rs

@@ -8,6 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-musl
+// ignore-x86
+
 use std::fmt::Debug;
 
 trait Foo {

src/test/ui/impl-trait/impl-generic-mismatch.stderr

@@ -1,5 +1,5 @@
 error[E0643]: method `foo` has incompatible signature for trait
-  --> $DIR/impl-generic-mismatch.rs:18:12
+  --> $DIR/impl-generic-mismatch.rs:21:12
    |
 LL |     fn foo(&self, _: &impl Debug);
    |                       ---------- declaration in trait here
@@ -12,7 +12,7 @@ LL |     fn foo(&self, _: &impl Debug) { }
    |          --           ^^^^^^^^^^
 
 error[E0643]: method `bar` has incompatible signature for trait
-  --> $DIR/impl-generic-mismatch.rs:27:23
+  --> $DIR/impl-generic-mismatch.rs:30:23
    |
 LL |     fn bar<U: Debug>(&self, _: &U);
    |            - declaration in trait here
@@ -25,7 +25,7 @@ LL |     fn bar<U: Debug>(&self, _: &U) { }
    |           ^^^^^^^^^^            ^
 
 error[E0643]: method `hash` has incompatible signature for trait
-  --> $DIR/impl-generic-mismatch.rs:38:33
+  --> $DIR/impl-generic-mismatch.rs:41:33
    |
 LL |     fn hash(&self, hasher: &mut impl Hasher) {}
    |                                 ^^^^^^^^^^^ expected generic parameter, found `impl Trait`