dev-lang/rust : version && EAPI bump

6 files changed, 600 insertions, 95 deletions

diff --git a/dev-lang/rust/Manifest b/dev-lang/rust/Manifest
index 1b6cc1de..6882731e 100644
--- a/dev-lang/rust/Manifest
+++ b/dev-lang/rust/Manifest
@@ -1,2 +1,2 @@
-DIST rust-1.30.1-x86_64-unknown-linux-gnu.tar.xz 145148116 BLAKE2B e70d667d880656209c036b72f619b1bd29679878ff4b8865f0453c064c4a8a53a96e73994509637312032e1260eeb0e53f7372ca1526760b1631846ed6a4c571 SHA512 05238b65b5184e3df81dbcf1cc1035a03054ef09a8563fe60877e4f078d0d2cad71aec73c1451196171f39f8e729059e91c7eed7b1402e03801c0b7e81815885
-DIST rustc-1.31.1-src.tar.xz 96915864 BLAKE2B bedfe1d56e2f99bb43b4b652d540aedf0a86c47b8493f28fb29e5af3135ff469ed40775bc2ee25ac5bd28a264ecba0094d7c9b6aae25ea365ed3e6f354ffa40b SHA512 d6688711452295c41468af214f036499074d82fbeedc3f03560275219c2fae910e623e38e3210176d86f78ba5533ea098da5ff21532c8ad1a5aac132bb74ee02
+DIST rust-1.33.0-x86_64-unknown-linux-gnu.tar.xz 155298128 BLAKE2B af5bc628bc054bd354d5af78e53cd2ffbfbdf2c2d3a3e58eeb593f148c54024fa5905aa53a69c514d6d41e48688697e1ce8adb866817c77cdf541399f6e7956f SHA512 b7f3087f34e99517cd729f5ff1f8cce3f3254cb36c734d5b90d878293e4406934c2f597bf7e2941e9257046f62c9274eb4769a64dabfbc5f0bbf2a1703f7fef8
+DIST rustc-1.34.2-src.tar.xz 95048792 BLAKE2B e81e4bfda87ddfb09ab8a74792346970aa440c678d2bb1279c329db4929282f761ada6fea9d81ceeecfd513613025c8e636487626fc36bd0b33559e045bb1b15 SHA512 f1bd2b226d90aae8a4657e6117b9a8451d4ce8129f79cc0fce0da7613a3b7800e690bc0ede8fec20a2f5f32c13fa8e22ac97d3838e0d36936793535a75d9c381
diff --git a/dev-lang/rust/files/0001-llvm-cmake-Add-additional-headers-only-if-they-exist.patch b/dev-lang/rust/files/0001-llvm-cmake-Add-additional-headers-only-if-they-exist.patch
new file mode 100644
index 00000000..b33311c0
--- /dev/null
+++ b/dev-lang/rust/files/0001-llvm-cmake-Add-additional-headers-only-if-they-exist.patch
@@ -0,0 +1,41 @@
+From 1f68002cb725c6a8fb5ca8425c1c86495a053f4f Mon Sep 17 00:00:00 2001
+From: Michal Gorny <mgorny@gentoo.org>
+Date: Thu, 4 Apr 2019 14:21:38 +0000
+Subject: [PATCH] [llvm] [cmake] Add additional headers only if they exist
+
+Modify the add_header_files_for_glob() function to only add files
+that do exist, rather than all matches of the glob.  This fixes CMake
+error when one of the include directories (which happen to include
+/usr/include) contain broken symlinks.
+
+Differential Revision: https://reviews.llvm.org/D59632
+
+llvm-svn: 357701
+---
+ llvm/cmake/modules/LLVMProcessSources.cmake | 10 +++++++++-
+ 1 file changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/cmake/modules/LLVMProcessSources.cmake b/cmake/modules/LLVMProcessSources.cmake
+index 7cbd2863500..d0be0e8b3ba 100644
+--- a/src/llvm-project/llvm/cmake/modules/LLVMProcessSources.cmake
++++ b/src/llvm-project/llvm/cmake/modules/LLVMProcessSources.cmake
+@@ -30,7 +30,15 @@ endmacro(add_td_sources)
+
+ function(add_header_files_for_glob hdrs_out glob)
+   file(GLOB hds ${glob})
+-  set(${hdrs_out} ${hds} PARENT_SCOPE)
++  set(filtered)
++  foreach(file ${hds})
++    # Explicit existence check is necessary to filter dangling symlinks
++    # out.  See https://bugs.gentoo.org/674662.
++    if(EXISTS ${file})
++      list(APPEND filtered ${file})
++    endif()
++  endforeach()
++  set(${hdrs_out} ${filtered} PARENT_SCOPE)
+ endfunction(add_header_files_for_glob)
+
+ function(find_all_header_files hdrs_out additional_headerdirs)
+--
+2.21.0
+
diff --git a/dev-lang/rust/files/1.30.1-clippy-sysroot.patch b/dev-lang/rust/files/1.30.1-clippy-sysroot.patch
deleted file mode 100644
index d38f8ba5..00000000
--- a/dev-lang/rust/files/1.30.1-clippy-sysroot.patch
+++ /dev/null
@@ -1,62 +0,0 @@
---- a/src/tools/clippy/src/driver.rs	2018-10-25 20:09:06.143109996 +0300
-+++ b/src/tools/clippy/src/driver.rs	2018-10-25 20:11:09.204106005 +0300
-@@ -29,54 +29,22 @@
-             exit(0);
-         }
- 
--        let sys_root = option_env!("SYSROOT")
--            .map(String::from)
--            .or_else(|| std::env::var("SYSROOT").ok())
--            .or_else(|| {
--                let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
--                let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
--                home.and_then(|home| toolchain.map(|toolchain| format!("{}/toolchains/{}", home, toolchain)))
--            })
--            .or_else(|| {
--                Command::new("rustc")
--                    .arg("--print")
--                    .arg("sysroot")
--                    .output()
--                    .ok()
--                    .and_then(|out| String::from_utf8(out.stdout).ok())
--                    .map(|s| s.trim().to_owned())
--            })
--            .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust");
--
-         // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
-         // We're invoking the compiler programmatically, so we ignore this/
--        let mut orig_args: Vec<String> = env::args().collect();
--        if orig_args.len() <= 1 {
-+        let mut args: Vec<String> = env::args().collect();
-+        if args.len() <= 1 {
-             std::process::exit(1);
-         }
--        if Path::new(&orig_args[1]).file_stem() == Some("rustc".as_ref()) {
-+        if Path::new(&args[1]).file_stem() == Some("rustc".as_ref()) {
-             // we still want to be able to invoke it normally though
--            orig_args.remove(1);
-+            args.remove(1);
-         }
--        // this conditional check for the --sysroot flag is there so users can call
--        // `clippy_driver` directly
--        // without having to pass --sysroot or anything
--        let mut args: Vec<String> = if orig_args.iter().any(|s| s == "--sysroot") {
--            orig_args.clone()
--        } else {
--            orig_args
--                .clone()
--                .into_iter()
--                .chain(Some("--sysroot".to_owned()))
--                .chain(Some(sys_root))
--                .collect()
--        };
- 
-         // this check ensures that dependencies are built but not linted and the final
-         // crate is
-         // linted but not built
-         let clippy_enabled = env::var("CLIPPY_TESTS").ok().map_or(false, |val| val == "true")
--            || orig_args.iter().any(|s| s == "--emit=dep-info,metadata");
-+            || args.iter().any(|s| s == "--emit=dep-info,metadata");
- 
-         if clippy_enabled {
-             args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-clippy""#.to_owned()]);
diff --git a/dev-lang/rust/files/1.34.0-doc-build-fix.patch b/dev-lang/rust/files/1.34.0-doc-build-fix.patch
new file mode 100644
index 00000000..52b8d6ea
--- /dev/null
+++ b/dev-lang/rust/files/1.34.0-doc-build-fix.patch
@@ -0,0 +1,442 @@
+From 9efc93c96dd6746460cef916d307b72ba21a7fd0 Mon Sep 17 00:00:00 2001
+From: Mark Rousskov <mark.simulacrum@gmail.com>
+Date: Sun, 3 Mar 2019 09:29:59 -0700
+Subject: [PATCH 1/2] Tools built by the bootstrap compiler must be built by it
+
+This avoids building compilers that we don't need -- most tools will work
+just fine with the downloaded compiler.
+---
+ src/bootstrap/doc.rs  |   6 ++-
+ src/bootstrap/test.rs |  10 ++--
+ src/bootstrap/tool.rs | 104 +++++++++++++++++++++++++++---------------
+ 3 files changed, 78 insertions(+), 42 deletions(-)
+
+diff --git a/src/bootstrap/doc.rs b/src/bootstrap/doc.rs
+index e0ad0422a6ce..621e3a95473e 100644
+--- a/src/bootstrap/doc.rs
++++ b/src/bootstrap/doc.rs
+@@ -883,7 +883,11 @@ impl Step for ErrorIndex {
+         builder.info(&format!("Documenting error index ({})", target));
+         let out = builder.doc_out(target);
+         t!(fs::create_dir_all(&out));
+-        let mut index = builder.tool_cmd(Tool::ErrorIndex);
++        let compiler = builder.compiler(2, builder.config.build);
++        let mut index = tool::ErrorIndex::command(
++            builder,
++            compiler,
++        );
+         index.arg("html");
+         index.arg(out.join("error-index.html"));
+ 
+diff --git a/src/bootstrap/test.rs b/src/bootstrap/test.rs
+index 51412f79c3d0..5abf9d699784 100644
+--- a/src/bootstrap/test.rs
++++ b/src/bootstrap/test.rs
+@@ -414,7 +414,6 @@ impl Step for Miri {
+ 
+ #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+ pub struct CompiletestTest {
+-    stage: u32,
+     host: Interned<String>,
+ }
+ 
+@@ -427,16 +426,14 @@ impl Step for CompiletestTest {
+ 
+     fn make_run(run: RunConfig<'_>) {
+         run.builder.ensure(CompiletestTest {
+-            stage: run.builder.top_stage,
+             host: run.target,
+         });
+     }
+ 
+     /// Runs `cargo test` for compiletest.
+     fn run(self, builder: &Builder<'_>) {
+-        let stage = self.stage;
+         let host = self.host;
+-        let compiler = builder.compiler(stage, host);
++        let compiler = builder.compiler(0, host);
+ 
+         let mut cargo = tool::prepare_tool_cargo(builder,
+                                                  compiler,
+@@ -1426,7 +1423,10 @@ impl Step for ErrorIndex {
+         t!(fs::create_dir_all(&dir));
+         let output = dir.join("error-index.md");
+ 
+-        let mut tool = builder.tool_cmd(Tool::ErrorIndex);
++        let mut tool = tool::ErrorIndex::command(
++            builder,
++            builder.compiler(compiler.stage, builder.config.build),
++        );
+         tool.arg("markdown")
+             .arg(&output)
+             .env("CFG_BUILD", &builder.config.build)
+diff --git a/src/bootstrap/tool.rs b/src/bootstrap/tool.rs
+index fc1a17d54667..4f2aa0b795dc 100644
+--- a/src/bootstrap/tool.rs
++++ b/src/bootstrap/tool.rs
+@@ -250,9 +250,9 @@ pub fn prepare_tool_cargo(
+     cargo
+ }
+ 
+-macro_rules! tool {
++macro_rules! bootstrap_tool {
+     ($(
+-        $name:ident, $path:expr, $tool_name:expr, $mode:expr
++        $name:ident, $path:expr, $tool_name:expr
+         $(,llvm_tools = $llvm:expr)*
+         $(,is_external_tool = $external:expr)*
+         ;
+@@ -266,10 +266,7 @@ macro_rules! tool {
+ 
+         impl Tool {
+             pub fn get_mode(&self) -> Mode {
+-                let mode = match self {
+-                    $(Tool::$name => $mode,)+
+-                };
+-                mode
++                Mode::ToolBootstrap
+             }
+ 
+             /// Whether this tool requires LLVM to run
+@@ -282,27 +279,15 @@ macro_rules! tool {
+ 
+         impl<'a> Builder<'a> {
+             pub fn tool_exe(&self, tool: Tool) -> PathBuf {
+-                let stage = self.tool_default_stage(tool);
+                 match tool {
+                     $(Tool::$name =>
+                         self.ensure($name {
+-                            compiler: self.compiler(stage, self.config.build),
++                            compiler: self.compiler(0, self.config.build),
+                             target: self.config.build,
+                         }),
+                     )+
+                 }
+             }
+-
+-            pub fn tool_default_stage(&self, tool: Tool) -> u32 {
+-                // Compile the error-index in the same stage as rustdoc to avoid
+-                // recompiling rustdoc twice if we can. Otherwise compile
+-                // everything else in stage0 as there's no need to rebootstrap
+-                // everything.
+-                match tool {
+-                    Tool::ErrorIndex if self.top_stage >= 2 => self.top_stage,
+-                    _ => 0,
+-                }
+-            }
+         }
+ 
+         $(
+@@ -321,7 +306,8 @@ macro_rules! tool {
+ 
+             fn make_run(run: RunConfig<'_>) {
+                 run.builder.ensure($name {
+-                    compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
++                    // snapshot compiler
++                    compiler: run.builder.compiler(0, run.builder.config.build),
+                     target: run.target,
+                 });
+             }
+@@ -331,7 +317,7 @@ macro_rules! tool {
+                     compiler: self.compiler,
+                     target: self.target,
+                     tool: $tool_name,
+-                    mode: $mode,
++                    mode: Mode::ToolBootstrap,
+                     path: $path,
+                     is_optional_tool: false,
+                     source_type: if false $(|| $external)* {
+@@ -347,21 +333,67 @@ macro_rules! tool {
+     }
+ }
+ 
+-tool!(
+-    Rustbook, "src/tools/rustbook", "rustbook", Mode::ToolBootstrap;
+-    ErrorIndex, "src/tools/error_index_generator", "error_index_generator", Mode::ToolRustc;
+-    UnstableBookGen, "src/tools/unstable-book-gen", "unstable-book-gen", Mode::ToolBootstrap;
+-    Tidy, "src/tools/tidy", "tidy", Mode::ToolBootstrap;
+-    Linkchecker, "src/tools/linkchecker", "linkchecker", Mode::ToolBootstrap;
+-    CargoTest, "src/tools/cargotest", "cargotest", Mode::ToolBootstrap;
+-    Compiletest, "src/tools/compiletest", "compiletest", Mode::ToolBootstrap, llvm_tools = true;
+-    BuildManifest, "src/tools/build-manifest", "build-manifest", Mode::ToolBootstrap;
+-    RemoteTestClient, "src/tools/remote-test-client", "remote-test-client", Mode::ToolBootstrap;
+-    RustInstaller, "src/tools/rust-installer", "fabricate", Mode::ToolBootstrap,
+-        is_external_tool = true;
+-    RustdocTheme, "src/tools/rustdoc-themes", "rustdoc-themes", Mode::ToolBootstrap;
++bootstrap_tool!(
++    Rustbook, "src/tools/rustbook", "rustbook";
++    UnstableBookGen, "src/tools/unstable-book-gen", "unstable-book-gen";
++    Tidy, "src/tools/tidy", "tidy";
++    Linkchecker, "src/tools/linkchecker", "linkchecker";
++    CargoTest, "src/tools/cargotest", "cargotest";
++    Compiletest, "src/tools/compiletest", "compiletest", llvm_tools = true;
++    BuildManifest, "src/tools/build-manifest", "build-manifest";
++    RemoteTestClient, "src/tools/remote-test-client", "remote-test-client";
++    RustInstaller, "src/tools/rust-installer", "fabricate", is_external_tool = true;
++    RustdocTheme, "src/tools/rustdoc-themes", "rustdoc-themes";
+ );
+ 
++#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
++pub struct ErrorIndex {
++    pub compiler: Compiler,
++}
++
++impl ErrorIndex {
++    pub fn command(builder: &Builder<'_>, compiler: Compiler) -> Command {
++        let mut cmd = Command::new(builder.ensure(ErrorIndex {
++            compiler
++        }));
++        add_lib_path(
++            vec![PathBuf::from(&builder.sysroot_libdir(compiler, compiler.host))],
++            &mut cmd,
++        );
++        cmd
++    }
++}
++
++impl Step for ErrorIndex {
++    type Output = PathBuf;
++
++    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
++        run.path("src/tools/error_index_generator")
++    }
++
++    fn make_run(run: RunConfig<'_>) {
++        // Compile the error-index in the same stage as rustdoc to avoid
++        // recompiling rustdoc twice if we can.
++        let stage = if run.builder.top_stage >= 2 { run.builder.top_stage } else { 0 };
++        run.builder.ensure(ErrorIndex {
++            compiler: run.builder.compiler(stage, run.builder.config.build),
++        });
++    }
++
++    fn run(self, builder: &Builder<'_>) -> PathBuf {
++        builder.ensure(ToolBuild {
++            compiler: self.compiler,
++            target: self.compiler.host,
++            tool: "error_index_generator",
++            mode: Mode::ToolRustc,
++            path: "src/tools/error_index_generator",
++            is_optional_tool: false,
++            source_type: SourceType::InTree,
++            extra_features: Vec::new(),
++        }).expect("expected to build -- essential tool")
++    }
++}
++
+ #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
+ pub struct RemoteTestServer {
+     pub compiler: Compiler,
+@@ -625,7 +657,7 @@ impl<'a> Builder<'a> {
+     /// `host`.
+     pub fn tool_cmd(&self, tool: Tool) -> Command {
+         let mut cmd = Command::new(self.tool_exe(tool));
+-        let compiler = self.compiler(self.tool_default_stage(tool), self.config.build);
++        let compiler = self.compiler(0, self.config.build);
+         self.prepare_tool_cmd(compiler, tool, &mut cmd);
+         cmd
+     }
+@@ -637,7 +669,7 @@ impl<'a> Builder<'a> {
+     fn prepare_tool_cmd(&self, compiler: Compiler, tool: Tool, cmd: &mut Command) {
+         let host = &compiler.host;
+         let mut lib_paths: Vec<PathBuf> = vec![
+-            if compiler.stage == 0 && tool != Tool::ErrorIndex {
++            if compiler.stage == 0 {
+                 self.build.rustc_snapshot_libdir()
+             } else {
+                 PathBuf::from(&self.sysroot_libdir(compiler, compiler.host))
+
+From 03718ed67a7b8fd57fc27316ec57ac3bc0f13d06 Mon Sep 17 00:00:00 2001
+From: Mark Rousskov <mark.simulacrum@gmail.com>
+Date: Sun, 3 Mar 2019 09:50:56 -0700
+Subject: [PATCH 2/2] Permit getting stage 0 rustdoc
+
+This allows us to e.g. test compiletest, including doctests, in stage 0
+without building a fresh compiler and rustdoc.
+---
+ src/bootstrap/builder.rs | 15 +++++++--------
+ src/bootstrap/dist.rs    |  2 +-
+ src/bootstrap/doc.rs     |  8 ++++----
+ src/bootstrap/test.rs    |  8 ++++----
+ src/bootstrap/tool.rs    |  8 +++++---
+ 5 files changed, 21 insertions(+), 20 deletions(-)
+
+diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
+index 7e6c0a9f52aa..f8b7f25a7543 100644
+--- a/src/bootstrap/builder.rs
++++ b/src/bootstrap/builder.rs
+@@ -668,20 +668,19 @@ impl<'a> Builder<'a> {
+             .map(|entry| entry.path())
+     }
+ 
+-    pub fn rustdoc(&self, host: Interned<String>) -> PathBuf {
+-        self.ensure(tool::Rustdoc { host })
++    pub fn rustdoc(&self, compiler: Compiler) -> PathBuf {
++        self.ensure(tool::Rustdoc { compiler })
+     }
+ 
+-    pub fn rustdoc_cmd(&self, host: Interned<String>) -> Command {
++    pub fn rustdoc_cmd(&self, compiler: Compiler) -> Command {
+         let mut cmd = Command::new(&self.out.join("bootstrap/debug/rustdoc"));
+-        let compiler = self.compiler(self.top_stage, host);
+         cmd.env("RUSTC_STAGE", compiler.stage.to_string())
+             .env("RUSTC_SYSROOT", self.sysroot(compiler))
+             // Note that this is *not* the sysroot_libdir because rustdoc must be linked
+             // equivalently to rustc.
+             .env("RUSTDOC_LIBDIR", self.rustc_libdir(compiler))
+             .env("CFG_RELEASE_CHANNEL", &self.config.channel)
+-            .env("RUSTDOC_REAL", self.rustdoc(host))
++            .env("RUSTDOC_REAL", self.rustdoc(compiler))
+             .env("RUSTDOC_CRATE_VERSION", self.rust_version())
+             .env("RUSTC_BOOTSTRAP", "1");
+ 
+@@ -689,7 +688,7 @@ impl<'a> Builder<'a> {
+         cmd.env_remove("MAKEFLAGS");
+         cmd.env_remove("MFLAGS");
+ 
+-        if let Some(linker) = self.linker(host) {
++        if let Some(linker) = self.linker(compiler.host) {
+             cmd.env("RUSTC_TARGET_LINKER", linker);
+         }
+         cmd
+@@ -751,7 +750,7 @@ impl<'a> Builder<'a> {
+                 // This is the intended out directory for compiler documentation.
+                 my_out = self.compiler_doc_out(target);
+             }
+-            let rustdoc = self.rustdoc(compiler.host);
++            let rustdoc = self.rustdoc(compiler);
+             self.clear_if_dirty(&my_out, &rustdoc);
+         } else if cmd != "test" {
+             match mode {
+@@ -897,7 +896,7 @@ impl<'a> Builder<'a> {
+             .env(
+                 "RUSTDOC_REAL",
+                 if cmd == "doc" || cmd == "rustdoc" || (cmd == "test" && want_rustdoc) {
+-                    self.rustdoc(compiler.host)
++                    self.rustdoc(compiler)
+                 } else {
+                     PathBuf::from("/path/to/nowhere/rustdoc/not/required")
+                 },
+diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs
+index 2dae3f9135d8..3045cda125ee 100644
+--- a/src/bootstrap/dist.rs
++++ b/src/bootstrap/dist.rs
+@@ -479,7 +479,7 @@ impl Step for Rustc {
+             t!(fs::create_dir_all(image.join("bin")));
+             builder.cp_r(&src.join("bin"), &image.join("bin"));
+ 
+-            builder.install(&builder.rustdoc(compiler.host), &image.join("bin"), 0o755);
++            builder.install(&builder.rustdoc(compiler), &image.join("bin"), 0o755);
+ 
+             // Copy runtime DLLs needed by the compiler
+             if libdir != "bin" {
+diff --git a/src/bootstrap/doc.rs b/src/bootstrap/doc.rs
+index 621e3a95473e..ae329286486d 100644
+--- a/src/bootstrap/doc.rs
++++ b/src/bootstrap/doc.rs
+@@ -335,7 +335,7 @@ fn invoke_rustdoc(
+     let footer = builder.src.join("src/doc/footer.inc");
+     let version_info = out.join("version_info.html");
+ 
+-    let mut cmd = builder.rustdoc_cmd(compiler.host);
++    let mut cmd = builder.rustdoc_cmd(compiler);
+ 
+     let out = out.join("book");
+ 
+@@ -415,7 +415,7 @@ impl Step for Standalone {
+             }
+ 
+             let html = out.join(filename).with_extension("html");
+-            let rustdoc = builder.rustdoc(compiler.host);
++            let rustdoc = builder.rustdoc(compiler);
+             if up_to_date(&path, &html) &&
+                up_to_date(&footer, &html) &&
+                up_to_date(&favicon, &html) &&
+@@ -425,7 +425,7 @@ impl Step for Standalone {
+                 continue
+             }
+ 
+-            let mut cmd = builder.rustdoc_cmd(compiler.host);
++            let mut cmd = builder.rustdoc_cmd(compiler);
+             cmd.arg("--html-after-content").arg(&footer)
+                .arg("--html-before-content").arg(&version_info)
+                .arg("--html-in-header").arg(&favicon)
+@@ -824,7 +824,7 @@ impl Step for Rustdoc {
+         builder.ensure(Rustc { stage, target });
+ 
+         // Build rustdoc.
+-        builder.ensure(tool::Rustdoc { host: compiler.host });
++        builder.ensure(tool::Rustdoc { compiler: compiler });
+ 
+         // Symlink compiler docs to the output directory of rustdoc documentation.
+         let out_dir = builder.stage_out(compiler, Mode::ToolRustc)
+diff --git a/src/bootstrap/test.rs b/src/bootstrap/test.rs
+index 5abf9d699784..6b9960c355c5 100644
+--- a/src/bootstrap/test.rs
++++ b/src/bootstrap/test.rs
+@@ -177,7 +177,7 @@ impl Step for Cargotest {
+             cmd.arg(&builder.initial_cargo)
+                 .arg(&out_dir)
+                 .env("RUSTC", builder.rustc(compiler))
+-                .env("RUSTDOC", builder.rustdoc(compiler.host)),
++                .env("RUSTDOC", builder.rustdoc(compiler)),
+         );
+     }
+ }
+@@ -560,7 +560,7 @@ impl Step for RustdocTheme {
+                 builder.sysroot_libdir(self.compiler, self.compiler.host),
+             )
+             .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
+-            .env("RUSTDOC_REAL", builder.rustdoc(self.compiler.host))
++            .env("RUSTDOC_REAL", builder.rustdoc(self.compiler))
+             .env("RUSTDOC_CRATE_VERSION", builder.rust_version())
+             .env("RUSTC_BOOTSTRAP", "1");
+         if let Some(linker) = builder.linker(self.compiler.host) {
+@@ -995,7 +995,7 @@ impl Step for Compiletest {
+             || (mode == "ui" && is_rustdoc_ui)
+         {
+             cmd.arg("--rustdoc-path")
+-                .arg(builder.rustdoc(compiler.host));
++                .arg(builder.rustdoc(compiler));
+         }
+ 
+         cmd.arg("--src-base")
+@@ -1451,7 +1451,7 @@ fn markdown_test(builder: &Builder<'_>, compiler: Compiler, markdown: &Path) ->
+     }
+ 
+     builder.info(&format!("doc tests for: {}", markdown.display()));
+-    let mut cmd = builder.rustdoc_cmd(compiler.host);
++    let mut cmd = builder.rustdoc_cmd(compiler);
+     builder.add_rust_test_threads(&mut cmd);
+     cmd.arg("--test");
+     cmd.arg(markdown);
+diff --git a/src/bootstrap/tool.rs b/src/bootstrap/tool.rs
+index 4f2aa0b795dc..5fb83caac06c 100644
+--- a/src/bootstrap/tool.rs
++++ b/src/bootstrap/tool.rs
+@@ -430,7 +430,9 @@ impl Step for RemoteTestServer {
+ 
+ #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
+ pub struct Rustdoc {
+-    pub host: Interned<String>,
++    /// This should only ever be 0 or 2.
++    /// We sometimes want to reference the "bootstrap" rustdoc, which is why this option is here.
++    pub compiler: Compiler,
+ }
+ 
+ impl Step for Rustdoc {
+@@ -444,12 +446,12 @@ impl Step for Rustdoc {
+ 
+     fn make_run(run: RunConfig<'_>) {
+         run.builder.ensure(Rustdoc {
+-            host: run.host,
++            compiler: run.builder.compiler(run.builder.top_stage, run.host),
+         });
+     }
+ 
+     fn run(self, builder: &Builder<'_>) -> PathBuf {
+-        let target_compiler = builder.compiler(builder.top_stage, self.host);
++        let target_compiler = self.compiler;
+         if target_compiler.stage == 0 {
+             if !target_compiler.is_snapshot(builder) {
+                 panic!("rustdoc in stage 0 must be snapshot rustdoc");
diff --git a/dev-lang/rust/files/1.34.0-libressl.patch b/dev-lang/rust/files/1.34.0-libressl.patch
new file mode 100644
index 00000000..d5705f88
--- /dev/null
+++ b/dev-lang/rust/files/1.34.0-libressl.patch
@@ -0,0 +1,29 @@
+diff --git a/vendor/openssl-sys/.cargo-checksum.json b/vendor/openssl-sys/.cargo-checksum.json
+index b5c539431..9428e81b1 100644
+--- a/vendor/openssl-sys/.cargo-checksum.json
++++ b/vendor/openssl-sys/.cargo-checksum.json
+@@ -1 +1 @@
+-{"files":{"Cargo.toml":"b09af0445220130b1b1c45791a316435f7400cf2fab3abe9c419f4f8028cfb9c","LICENSE-MIT":"378f5840b258e2779c39418f3f2d7b2ba96f1c7917dd6be0713f88305dbda397","README.md":"96a414be6e7e061a21a9e39a61449039f6791225264032641dd044a1a9b88111","build/cfgs.rs":"fae5176c2b149d190c9611b58c5882312b5c0e483d1a404cfdf850473314a58f","build/main.rs":"c8bc352b94d05afeaeb96300341a695c70c3b62c46793a5c035aaf42e22b69d1","src/aes.rs":"660efd70f809cb2f5dbbf527be8f9592911776bab7dafa1fc4cc72dd9a576b67","src/asn1.rs":"4f12d2f4c2a493888db669d1ecfd55df40861a78cae65957f801ed91dc2cae30","src/bio.rs":"5c6f394a78f258af3babb68330fa3571610476c4c3ba3404359db928f2f706ee","src/bn.rs":"c71b9c79f704a94a889d27bf75e7e5b1f9f10b0df0aeb485aef509cf05d7467f","src/cms.rs":"29aa053b67b47515fd15812aa0a90ff35dd9fa347da2beeba96d6deafeb9d945","src/conf.rs":"511e008c18039f54d856d70b80009426fc7f4ce34fe4304e2c58ebf465031de0","src/crypto.rs":"f6e8a116940755b2b53e3d0d49d1b451fc6e4269831fd1cfcee9d6ed404cf487","src/dh.rs":"520b282b92fa372a75bc16696dc3ee7a9a5752e517a18862182a3e9f5a976d28","src/dsa.rs":"3c294c5c45235497396ac803b723b3a0cb5bd3609f5dec18338b5b014c2adeb9","src/dtls1.rs":"45e1dbf94a42d587fd948d553dc30187aa6aa2b5b82d554cf725ff36df768aa0","src/ec.rs":"b22d27b01a70652384866b3d0d01d2f7a0421b2ba2db9268ed379fef4b1ac034","src/err.rs":"81230711e081277e0b6dae4ff21266052d075688c758c2b0720001849ef9192d","src/evp.rs":"13a8a71154545d7c478e156edb21beb219824937aba6b29c6bc6ef895c735a3d","src/hmac.rs":"fa3976d94a1383f300bdec228270afb8b47c97bb019d727c7d59ba783be3c42e","src/lib.rs":"17b5a1faa0fe3ab777c8cb0039a3dffd8922b211bf1330c2cd0c3e02f624353c","src/macros.rs":"a7c95174fd4cfeb42f730c7c0744194009520249888dbf43968571219fd6dfa1","src/obj_mac.rs":"9c20609db7115c9edb99185375426169cb5b7caee839d892b556e92285e65309","src/object.rs":"7539eb2164c3fe2162a339ef5b45f1c835010a1522307803815779a01825eed7","src/ocsp.rs":"1db59566d2f072f7ae981f0c07e1604fcdf60e66845afe0689d588f8e4272115","src/ossl_typ.rs":"619177f939328597e4bcf9c41fdf4d0aa9207d779c6e0dafddbe2eab9b1a6a98","src/pem.rs":"3ae1c53dbc126a04c188575294111cc04c215c2f3e031192d5cc05952f011ddf","src/pkcs12.rs":"93aab2820008ad90dc346a7dcc02f9201d94bff0bb7d1d71031c097850287c50","src/pkcs7.rs":"5370c8d4bfbf1502fa33aff635cb730e7c87814580f1df9bdb1412a492377813","src/rand.rs":"469601b4fbb56d4dbf5cf5d7bb8483e3bde411edea18601e7d1ed6ef27180fd3","src/rsa.rs":"a0bf64f1f8ff9f6e5dbed6c38d8fa2d3d1c5dfcfe6dd3ff79f7737b072ce4681","src/safestack.rs":"6c39e28565d34efad707d77561d4caa99e3f028fcac3a2ef6fd403a78de1190c","src/sha.rs":"05044d221d8d205010a4e3760c0b5c0e2e923e165db0d65f9a8c9bcedaad9961","src/srtp.rs":"306047f3f31828fe7d15de154b375f071ae07012a94c0b5c909f5fe57962a11b","src/ssl.rs":"e69d3b9b8f2f8ae1ed3905a4dbe064ad1b7c1eaf21d7eabb86ecdb5b41e2120a","src/ssl3.rs":"9336c816e00847d552dea22587d4ac72ff3cbd469fa5ff750423a19ea11e68eb","src/stack.rs":"1a509907283e5a2bf88cf193ce607f49ce7d2d95547c2ce2abc0fd4567aad334","src/tls1.rs":"fd85a1683064def0a9e07d803b90102229adc1d58fa19cf4e56976f0dd7425b9","src/x509.rs":"839be2feb74755ab7df66a024ad27dfa70ce4f7889229d9152ba999f3a54b914","src/x509_vfy.rs":"5609f6300ab37a4d4755c81f7af1e6bb93a2f1a6f333c6e42f1e73ebf83ddc05","src/x509v3.rs":"66fd646ea4caf5ce81e3c881e88d85462519c4e97a7f82e82ca8ac52ea830ad2"},"package":"1bb974e77de925ef426b6bc82fce15fd45bdcbeb5728bffcfc7cdeeb7ce1c2d6"}
+\ No newline at end of file
++{"files":{"Cargo.toml":"b09af0445220130b1b1c45791a316435f7400cf2fab3abe9c419f4f8028cfb9c","LICENSE-MIT":"378f5840b258e2779c39418f3f2d7b2ba96f1c7917dd6be0713f88305dbda397","README.md":"96a414be6e7e061a21a9e39a61449039f6791225264032641dd044a1a9b88111","build/cfgs.rs":"fae5176c2b149d190c9611b58c5882312b5c0e483d1a404cfdf850473314a58f","build/main.rs":"45da6667bd8b1a35354ee1636df0b55f9d13d4ae45dd1fef5cf17c615c372bfd","src/aes.rs":"660efd70f809cb2f5dbbf527be8f9592911776bab7dafa1fc4cc72dd9a576b67","src/asn1.rs":"4f12d2f4c2a493888db669d1ecfd55df40861a78cae65957f801ed91dc2cae30","src/bio.rs":"5c6f394a78f258af3babb68330fa3571610476c4c3ba3404359db928f2f706ee","src/bn.rs":"c71b9c79f704a94a889d27bf75e7e5b1f9f10b0df0aeb485aef509cf05d7467f","src/cms.rs":"29aa053b67b47515fd15812aa0a90ff35dd9fa347da2beeba96d6deafeb9d945","src/conf.rs":"511e008c18039f54d856d70b80009426fc7f4ce34fe4304e2c58ebf465031de0","src/crypto.rs":"f6e8a116940755b2b53e3d0d49d1b451fc6e4269831fd1cfcee9d6ed404cf487","src/dh.rs":"520b282b92fa372a75bc16696dc3ee7a9a5752e517a18862182a3e9f5a976d28","src/dsa.rs":"3c294c5c45235497396ac803b723b3a0cb5bd3609f5dec18338b5b014c2adeb9","src/dtls1.rs":"45e1dbf94a42d587fd948d553dc30187aa6aa2b5b82d554cf725ff36df768aa0","src/ec.rs":"b22d27b01a70652384866b3d0d01d2f7a0421b2ba2db9268ed379fef4b1ac034","src/err.rs":"81230711e081277e0b6dae4ff21266052d075688c758c2b0720001849ef9192d","src/evp.rs":"13a8a71154545d7c478e156edb21beb219824937aba6b29c6bc6ef895c735a3d","src/hmac.rs":"fa3976d94a1383f300bdec228270afb8b47c97bb019d727c7d59ba783be3c42e","src/lib.rs":"17b5a1faa0fe3ab777c8cb0039a3dffd8922b211bf1330c2cd0c3e02f624353c","src/macros.rs":"a7c95174fd4cfeb42f730c7c0744194009520249888dbf43968571219fd6dfa1","src/obj_mac.rs":"9c20609db7115c9edb99185375426169cb5b7caee839d892b556e92285e65309","src/object.rs":"7539eb2164c3fe2162a339ef5b45f1c835010a1522307803815779a01825eed7","src/ocsp.rs":"1db59566d2f072f7ae981f0c07e1604fcdf60e66845afe0689d588f8e4272115","src/ossl_typ.rs":"619177f939328597e4bcf9c41fdf4d0aa9207d779c6e0dafddbe2eab9b1a6a98","src/pem.rs":"3ae1c53dbc126a04c188575294111cc04c215c2f3e031192d5cc05952f011ddf","src/pkcs12.rs":"93aab2820008ad90dc346a7dcc02f9201d94bff0bb7d1d71031c097850287c50","src/pkcs7.rs":"5370c8d4bfbf1502fa33aff635cb730e7c87814580f1df9bdb1412a492377813","src/rand.rs":"469601b4fbb56d4dbf5cf5d7bb8483e3bde411edea18601e7d1ed6ef27180fd3","src/rsa.rs":"a0bf64f1f8ff9f6e5dbed6c38d8fa2d3d1c5dfcfe6dd3ff79f7737b072ce4681","src/safestack.rs":"6c39e28565d34efad707d77561d4caa99e3f028fcac3a2ef6fd403a78de1190c","src/sha.rs":"05044d221d8d205010a4e3760c0b5c0e2e923e165db0d65f9a8c9bcedaad9961","src/srtp.rs":"306047f3f31828fe7d15de154b375f071ae07012a94c0b5c909f5fe57962a11b","src/ssl.rs":"e69d3b9b8f2f8ae1ed3905a4dbe064ad1b7c1eaf21d7eabb86ecdb5b41e2120a","src/ssl3.rs":"9336c816e00847d552dea22587d4ac72ff3cbd469fa5ff750423a19ea11e68eb","src/stack.rs":"1a509907283e5a2bf88cf193ce607f49ce7d2d95547c2ce2abc0fd4567aad334","src/tls1.rs":"fd85a1683064def0a9e07d803b90102229adc1d58fa19cf4e56976f0dd7425b9","src/x509.rs":"839be2feb74755ab7df66a024ad27dfa70ce4f7889229d9152ba999f3a54b914","src/x509_vfy.rs":"5609f6300ab37a4d4755c81f7af1e6bb93a2f1a6f333c6e42f1e73ebf83ddc05","src/x509v3.rs":"66fd646ea4caf5ce81e3c881e88d85462519c4e97a7f82e82ca8ac52ea830ad2"},"package":"1bb974e77de925ef426b6bc82fce15fd45bdcbeb5728bffcfc7cdeeb7ce1c2d6"}
+diff --git a/vendor/openssl-sys/build/main.rs b/vendor/openssl-sys/build/main.rs
+index 69def400e..08cc96eb9 100644
+--- a/vendor/openssl-sys/build/main.rs
++++ b/vendor/openssl-sys/build/main.rs
+@@ -505,6 +505,7 @@ See rust-openssl README for more information:
+             (8, 1) => ('8', '1'),
+             (8, _) => ('8', 'x'),
+             (9, 0) => ('9', '0'),
++            (9, _) => ('9', 'x'),
+             _ => version_error(),
+         };
+ 
+@@ -545,7 +546,7 @@ fn version_error() -> ! {
+         "
+ 
+ This crate is only compatible with OpenSSL 1.0.1 through 1.1.1, or LibreSSL 2.5
+-through 2.9.0, but a different version of OpenSSL was found. The build is now aborting
++through 2.9.x, but a different version of OpenSSL was found. The build is now aborting
+ due to this version mismatch.
+ 
+ "
diff --git a/dev-lang/rust/rust-1.31.1-r1337.ebuild b/dev-lang/rust/rust-1.34.2-r1337.ebuild
index ef29b1c8..da018ddd 100644
--- a/dev-lang/rust/rust-1.31.1-r1337.ebuild
+++ b/dev-lang/rust/rust-1.34.2-r1337.ebuild
@@ -1,9 +1,9 @@
-# Copyright 1999-2018 Gentoo Authors
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
 
-PYTHON_COMPAT=( python2_7 python3_{5,6} pypy )
+PYTHON_COMPAT=( python2_7 python3_{5,6,7} pypy )
 
 inherit check-reqs eapi7-ver estack flag-o-matic llvm multiprocessing multilib-build python-any-r1 rust-toolchain toolchain-funcs
 
@@ -14,13 +14,14 @@ if [[ ${PV} = *beta* ]]; then
 	SLOT="beta/${PV}"
 	SRC="${BETA_SNAPSHOT}/rustc-beta-src.tar.xz"
 else
-	SLOT="stable/1.31"
+	ABI_VER="$(ver_cut 1-2)"
+	SLOT="stable/${ABI_VER}"
 	MY_P="rustc-${PV}"
 	SRC="${MY_P}-src.tar.xz"
 	KEYWORDS="~amd64"
 fi
 
-RUST_STAGE0_VERSION="1.$(($(ver_cut 2) - 1)).1"
+RUST_STAGE0_VERSION="1.$(($(ver_cut 2) - 1)).0"
 
 DESCRIPTION="Systems programming language from Mozilla"
 HOMEPAGE="https://www.rust-lang.org/"
@@ -29,23 +30,42 @@ SRC_URI="https://static.rust-lang.org/dist/${SRC} -> rustc-${PV}-src.tar.xz
 		$(rust_arch_uri x86_64-unknown-linux-gnu rust-${RUST_STAGE0_VERSION})"
 
 ALL_LLVM_TARGETS=( AArch64 AMDGPU ARM BPF Hexagon Lanai Mips MSP430
-	NVPTX PowerPC Sparc SystemZ X86 XCore )
+	NVPTX PowerPC Sparc SystemZ WebAssembly X86 XCore )
 ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
 LLVM_TARGET_USEDEPS=${ALL_LLVM_TARGETS[@]/%/?}
 
 LICENSE="|| ( MIT Apache-2.0 ) BSD-1 BSD-2 BSD-4 UoI-NCSA"
 
-IUSE="clippy cpu_flags_x86_sse2 debug doc +jemalloc libressl rls rustfmt system-llvm wasm ${ALL_LLVM_TARGETS[*]}"
+IUSE="clippy cpu_flags_x86_sse2 debug doc libressl rls rustfmt system-llvm wasm ${ALL_LLVM_TARGETS[*]}"
+
+# Please keep the LLVM dependency block separate. Since LLVM is slotted,
+# we need to *really* make sure we're not pulling one than more slot
+# simultaneously.
+
+# How to use it:
+# 1. List all the working slots (with min versions) in ||, newest first.
+# 2. Update the := to specify *max* version, e.g. < 9.
+# 3. Specify LLVM_MAX_SLOT, e.g. 8.
+LLVM_DEPEND="
+	|| (
+		sys-devel/llvm:8[llvm_targets_WebAssembly?]
+	)
+	<sys-devel/llvm-9:=
+"
+LLVM_MAX_SLOT=8
 
 COMMON_DEPEND="
-		jemalloc? ( dev-libs/jemalloc )
-		sys-libs/zlib
-		!libressl? ( dev-libs/openssl:0= )
-		libressl? ( dev-libs/libressl:0= )
-		net-libs/libssh2
-		net-libs/http-parser:=
-		net-misc/curl[ssl]
-		system-llvm? ( >=sys-devel/llvm-6:= )"
+	sys-libs/zlib
+	!libressl? ( dev-libs/openssl:0= )
+	libressl? ( dev-libs/libressl:0= )
+	net-libs/libssh2
+	net-libs/http-parser:=
+	net-misc/curl[ssl]
+	system-llvm? (
+		${LLVM_DEPEND}
+	)
+"
+
 DEPEND="${COMMON_DEPEND}
 	${PYTHON_DEPS}
 	|| (
@@ -57,11 +77,17 @@ RDEPEND="${COMMON_DEPEND}
 	!dev-util/cargo
 	rustfmt? ( !dev-util/rustfmt )"
 REQUIRED_USE="|| ( ${ALL_LLVM_TARGETS[*]} )
-				x86? ( cpu_flags_x86_sse2 )"
+	wasm? ( llvm_targets_WebAssembly )
+	x86? ( cpu_flags_x86_sse2 )
+"
 
-S="${WORKDIR}/${MY_P}-src"
+PATCHES=(
+	"${FILESDIR}"/0001-llvm-cmake-Add-additional-headers-only-if-they-exist.patch
+	"${FILESDIR}"/1.34.0-doc-build-fix.patch
+	"${FILESDIR}"/1.34.0-libressl.patch # bug 684224
+)
 
-PATCHES=( "${FILESDIR}"/1.30.1-clippy-sysroot.patch )
+S="${WORKDIR}/${MY_P}-src"
 
 toml_usex() {
 	usex "$1" true false
@@ -69,11 +95,9 @@ toml_usex() {
 
 pre_build_checks() {
 	CHECKREQS_DISK_BUILD="7G"
-	CHECKREQS_MEMORY="4G"
 	eshopts_push -s extglob
 	if is-flagq '-g?(gdb)?([1-9])'; then
 		CHECKREQS_DISK_BUILD="10G"
-		CHECKREQS_MEMORY="16G"
 	fi
 	eshopts_pop
 	check-reqs_pkg_setup
@@ -86,9 +110,7 @@ pkg_pretend() {
 pkg_setup() {
 	pre_build_checks
 	python-any-r1_pkg_setup
-	if use system-llvm; then
-		llvm_pkg_setup
-	fi
+	use system-llvm && llvm_pkg_setup
 }
 
 src_prepare() {
@@ -98,6 +120,12 @@ src_prepare() {
 
 	"${WORKDIR}/${rust_stage0}"/install.sh --disable-ldconfig --destdir="${rust_stage0_root}" --prefix=/ || die
 
+	# ugly hack for https://bugs.gentoo.org/679806
+	if use ppc64; then
+		sed -i 's/getentropy/gEtEnTrOpY/g' "${rust_stage0_root}"/bin/cargo || die
+		export OPENSSL_ppccap=0
+	fi
+
 	default
 }
 
@@ -134,6 +162,7 @@ src_configure() {
 		release-debuginfo = $(toml_usex debug)
 		assertions = $(toml_usex debug)
 		targets = "${LLVM_TARGETS// /;}"
+		experimental-targets = ""
 		link-shared = $(toml_usex system-llvm)
 		[build]
 		build = "${rust_target}"
@@ -157,7 +186,6 @@ src_configure() {
 		optimize = $(toml_usex !debug)
 		debuginfo = $(toml_usex debug)
 		debug-assertions = $(toml_usex debug)
-		use-jemalloc = $(toml_usex jemalloc)
 		default-linker = "$(tc-getCC)"
 		channel = "stable"
 		rpath = false
@@ -181,7 +209,7 @@ src_configure() {
 		EOF
 		if use system-llvm; then
 			cat <<- EOF >> "${S}"/config.toml
-				llvm-config = "$(get_llvm_prefix)/bin/llvm-config"
+				llvm-config = "$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
 			EOF
 		fi
 	done
@@ -196,14 +224,14 @@ src_configure() {
 
 src_compile() {
 	env $(cat "${S}"/config.env)\
-		"${EPYTHON}" ./x.py build --config="${S}"/config.toml -j$(makeopts_jobs) \
+		"${EPYTHON}" ./x.py build -v --config="${S}"/config.toml -j$(makeopts_jobs) \
 		--exclude src/tools/miri || die # https://github.com/rust-lang/rust/issues/52305
 }
 
 src_install() {
 	local rust_target abi_libdir
 
-	env DESTDIR="${D}" "${EPYTHON}" ./x.py install || die
+	env DESTDIR="${D}" "${EPYTHON}" ./x.py install -v || die
 
 	# Copy shared library versions of standard libraries for all targets
 	# into the system's abi-dependent lib directories because the rust
@@ -214,9 +242,9 @@ src_install() {
 		fi
 		abi_libdir=$(get_abi_LIBDIR ${v##*.})
 		rust_target=$(rust_abi $(get_abi_CHOST ${v##*.}))
-		mkdir -p "${D}/usr/${abi_libdir}"
-		cp "${D}/usr/$(get_libdir)/${P}/rustlib/${rust_target}/lib"/*.so \
-		   "${D}/usr/${abi_libdir}" || die
+		mkdir -p "${ED}/usr/${abi_libdir}"
+		cp "${ED}/usr/$(get_libdir)/${P}/rustlib/${rust_target}/lib"/*.so \
+		   "${ED}/usr/${abi_libdir}" || die
 	done
 
 	dodoc COPYRIGHT
@@ -224,8 +252,35 @@ src_install() {
 	# FIXME:
 	# Really not sure if that env is needed, specailly LDPATH
 	cat <<-EOF > "${T}"/50${P}
-		LDPATH="/usr/$(get_libdir)/${P}"
-		MANPATH="/usr/share/${P}/man"
+		LDPATH="${EPREFIX}/usr/$(get_libdir)/${P}"
+		MANPATH="${EPREFIX}/usr/share/${P}/man"
 	EOF
 	doenvd "${T}"/50${P}
 }
+
+pkg_postinst() {
+	eselect rust update --if-unset
+
+	elog "Rust installs a helper script for calling GDB and LLDB,"
+	elog "for your convenience it is installed under /usr/bin/rust-{gdb,lldb}-${PV}."
+
+	ewarn "cargo is now installed from dev-lang/rust{,-bin} instead of dev-util/cargo."
+	ewarn "This might have resulted in a dangling symlink for /usr/bin/cargo on some"
+	ewarn "systems. This can be resolved by calling 'sudo eselect rust set ${P}'."
+
+	if has_version app-editors/emacs || has_version app-editors/emacs-vcs; then
+		elog "install app-emacs/rust-mode to get emacs support for rust."
+	fi
+
+	if has_version app-editors/gvim || has_version app-editors/vim; then
+		elog "install app-vim/rust-vim to get vim support for rust."
+	fi
+
+	if has_version 'app-shells/zsh'; then
+		elog "install app-shells/rust-zshcomp to get zsh completion for rust."
+	fi
+}
+
+pkg_postrm() {
+	eselect rust unset --if-invalid
+}