rustc: Don't use relative paths for extended errors

These no longer work now that Cargo changes the cwd of rustc while it's running.
Instead use an absolute path that's set by rustbuild.

Author: alexcrichton

src/bootstrap/builder.rs

@@ -484,8 +484,8 @@ impl<'a> Builder<'a> {
              } else {
                  PathBuf::from("/path/to/nowhere/rustdoc/not/required")
              })
-             .env("TEST_MIRI", self.config.test_miri.to_string());
-
+             .env("TEST_MIRI", self.config.test_miri.to_string())
+             .env("RUSTC_ERROR_METADATA_DST", self.extended_error_dir());
         if let Some(n) = self.config.rust_codegen_units {
             cargo.env("RUSTC_CODEGEN_UNITS", n.to_string());
         }

src/bootstrap/check.rs

@@ -975,7 +975,8 @@ impl Step for ErrorIndex {
         build.run(builder.tool_cmd(Tool::ErrorIndex)
                     .arg("markdown")
                     .arg(&output)
-                    .env("CFG_BUILD", &build.build));
+                    .env("CFG_BUILD", &build.build)
+                    .env("RUSTC_ERROR_METADATA_DST", build.extended_error_dir()));
 
         markdown_test(builder, compiler, &output);
     }

src/bootstrap/doc.rs

@@ -671,7 +671,8 @@ impl Step for ErrorIndex {
         index.arg(out.join("error-index.html"));
 
         // FIXME: shouldn't have to pass this env var
-        index.env("CFG_BUILD", &build.build);
+        index.env("CFG_BUILD", &build.build)
+             .env("RUSTC_ERROR_METADATA_DST", build.extended_error_dir());
 
         build.run(&mut index);
     }

src/bootstrap/lib.rs

@@ -718,6 +718,11 @@ impl Build {
         self.config.python.as_ref().unwrap()
     }
 
+    /// Temporary directory that extended error information is emitted to.
+    fn extended_error_dir(&self) -> PathBuf {
+        self.out.join("tmp/extended-error-metadata")
+    }
+
     /// Tests whether the `compiler` compiling for `target` should be forced to
     /// use a stage1 compiler instead.
     ///

src/librustc/lib.rs

@@ -175,4 +175,5 @@ fn noop() {
 
 
 // Build the diagnostics array at the end so that the metadata includes error use sites.
+#[cfg(not(stage0))] // remove after the next snapshot
 __build_diagnostic_array! { librustc, DIAGNOSTICS }

src/librustc_const_eval/lib.rs

@@ -56,4 +56,5 @@ pub fn provide(providers: &mut Providers) {
 }
 
 // Build the diagnostics array at the end so that the metadata includes error use sites.
+#[cfg(not(stage0))] // remove after the next snapshot
 __build_diagnostic_array! { librustc_const_eval, DIAGNOSTICS }

src/librustc_driver/lib.rs

@@ -1268,6 +1268,14 @@ fn exit_on_err() -> ! {
     panic!();
 }
 
+#[cfg(stage0)]
+pub fn diagnostics_registry() -> errors::registry::Registry {
+    use errors::registry::Registry;
+
+    Registry::new(&[])
+}
+
+#[cfg(not(stage0))]
 pub fn diagnostics_registry() -> errors::registry::Registry {
     use errors::registry::Registry;
 

src/librustc_metadata/lib.rs

@@ -58,4 +58,5 @@ pub mod cstore;
 pub mod dynamic_lib;
 pub mod locator;
 
+#[cfg(not(stage0))] // remove after the next snapshot
 __build_diagnostic_array! { librustc_metadata, DIAGNOSTICS }

src/librustc_mir/lib.rs

@@ -79,4 +79,5 @@ pub fn provide(providers: &mut Providers) {
     providers.const_eval = interpret::const_eval_provider;
 }
 
+#[cfg(not(stage0))] // remove after the next snapshot
 __build_diagnostic_array! { librustc_mir, DIAGNOSTICS }

src/librustc_passes/lib.rs

@@ -45,6 +45,7 @@ mod mir_stats;
 pub mod no_asm;
 pub mod static_recursion;
 
+#[cfg(not(stage0))] // remove after the next snapshot
 __build_diagnostic_array! { librustc_passes, DIAGNOSTICS }
 
 pub fn provide(providers: &mut Providers) {