rust: drop custom target finding patch

We shouldn't need to patch rustc to find the target but instead pass the
full path to the target spec. This should solve #138.

classes/cargo.bbclass

@@ -56,12 +56,14 @@ cargo_do_configure () {
 
 RUSTFLAGS ??= ""
 CARGO_BUILD_FLAGS = "-v --target ${HOST_SYS} --release"
+RUST_TARGET_PATH = "${STAGING_LIBDIR_NATIVE}/rustlib"
 
 # This is based on the content of CARGO_BUILD_FLAGS and generally will need to
 # change if CARGO_BUILD_FLAGS changes.
 CARGO_TARGET_SUBDIR="${HOST_SYS}/release"
 oe_cargo_build () {
 	export RUSTFLAGS="${RUSTFLAGS}"
+	export RUST_TARGET_PATH="${RUST_TARGET_PATH}"
 	bbnote "cargo = $(which cargo)"
 	bbnote "rustc = $(which rustc)"
 	bbnote "${CARGO} build ${CARGO_BUILD_FLAGS} $@"

recipes-devtools/rust/files/rust-1.15.1/0001-Target-add-default-target.json-path-libdir-rust-targ.patch

@@ -1,106 +0,0 @@
-From e9c6cf5d1a9bb7f50c5e98a660217062b510928b Mon Sep 17 00:00:00 2001
-From: Cody P Schafer <dev@codyps.com>
-Date: Tue, 18 Nov 2014 01:40:21 -0500
-Subject: [PATCH 1/3] Target: add default target.json path:
- $libdir/rust/targets
-
----
- src/librustc/session/config.rs  |  6 +++---
- src/librustc/session/mod.rs     |  8 ++++++--
- src/librustc_back/target/mod.rs | 12 ++++++++++--
- 3 files changed, 19 insertions(+), 7 deletions(-)
-
-diff --git a/src/librustc/session/config.rs b/src/librustc/session/config.rs
-index 5e3c8bc..15fd763 100644
---- a/src/librustc/session/config.rs
-+++ b/src/librustc/session/config.rs
-@@ -42,7 +42,7 @@ use std::hash::Hasher;
- use std::collections::hash_map::DefaultHasher;
- use std::collections::HashSet;
- use std::iter::FromIterator;
--use std::path::PathBuf;
-+use std::path::{Path, PathBuf};
- 
- pub struct Config {
-     pub target: Target,
-@@ -1001,8 +1001,8 @@ pub fn build_configuration(sess: &Session,
-     user_cfg
- }
- 
--pub fn build_target_config(opts: &Options, sp: &Handler) -> Config {
--    let target = match Target::search(&opts.target_triple) {
-+pub fn build_target_config(sysroot: &Path, opts: &Options, sp: &Handler) -> Config {
-+    let target = match Target::search(sysroot, &opts.target_triple[..]) {
-         Ok(t) => t,
-         Err(e) => {
-             sp.struct_fatal(&format!("Error loading target specification: {}", e))
-diff --git a/src/librustc/session/mod.rs b/src/librustc/session/mod.rs
-index 91765e6..29e5e5d 100644
---- a/src/librustc/session/mod.rs
-+++ b/src/librustc/session/mod.rs
-@@ -575,13 +575,17 @@ pub fn build_session_(sopts: config::Options,
-                       codemap: Rc<codemap::CodeMap>,
-                       cstore: Rc<for<'a> CrateStore<'a>>)
-                       -> Session {
--    let host = match Target::search(config::host_triple()) {
-+    let sysroot = match sopts.maybe_sysroot {
-+        Some(ref x) => PathBuf::from(x),
-+        None => filesearch::get_or_default_sysroot()
-+    };
-+    let host = match Target::search(&sysroot, config::host_triple()) {
-         Ok(t) => t,
-         Err(e) => {
-             panic!(span_diagnostic.fatal(&format!("Error loading host specification: {}", e)));
-     }
-     };
--    let target_cfg = config::build_target_config(&sopts, &span_diagnostic);
-+    let target_cfg = config::build_target_config(&sysroot, &sopts, &span_diagnostic);
-     let p_s = parse::ParseSess::with_span_handler(span_diagnostic, codemap);
-     let default_sysroot = match sopts.maybe_sysroot {
-         Some(_) => None,
-diff --git a/src/librustc_back/target/mod.rs b/src/librustc_back/target/mod.rs
-index 351d469..3282dbd 100644
---- a/src/librustc_back/target/mod.rs
-+++ b/src/librustc_back/target/mod.rs
-@@ -51,6 +51,7 @@ use std::io::prelude::*;
- use syntax::abi::{Abi, lookup as lookup_abi};
- 
- use PanicStrategy;
-+use std::path::Path;
- 
- mod android_base;
- mod apple_base;
-@@ -625,12 +626,13 @@ impl Target {
-     ///
-     /// The error string could come from any of the APIs called, including
-     /// filesystem access and JSON decoding.
--    pub fn search(target: &str) -> Result<Target, String> {
-+    pub fn search(sysroot: &Path, target: &str) -> Result<Target, String> {
-         use std::env;
-         use std::ffi::OsString;
-         use std::fs::File;
-         use std::path::{Path, PathBuf};
-         use serialize::json;
-+        use std::iter::IntoIterator;
- 
-         fn load_file(path: &Path) -> Result<Target, String> {
-             let mut f = File::open(path).map_err(|e| e.to_string())?;
-@@ -661,8 +663,14 @@ impl Target {
-                               .unwrap_or(OsString::new());
- 
-         // FIXME 16351: add a sane default search path?
-+        let mut default_path = sysroot.to_owned();
-+        default_path.push(env!("CFG_LIBDIR_RELATIVE"));
-+        default_path.push("rustlib");
- 
--        for dir in env::split_paths(&target_path) {
-+        let paths = env::split_paths(&target_path)
-+            .chain(Some(default_path).into_iter());
-+
-+        for dir in paths {
-             let p =  dir.join(&path);
-             if p.is_file() {
-                 return load_file(&p);
--- 
-2.10.1 (Apple Git-78)
-

recipes-devtools/rust/rust_1.15.1.bb

@@ -4,7 +4,6 @@ require rust-source-${PV}.inc
 EXTRA_OECONF = "--disable-rustbuild"
 
 SRC_URI += " \
-        file://rust-${PV}/0001-Target-add-default-target.json-path-libdir-rust-targ.patch \
         file://rust-${PV}/0003-std-thread_local-workaround-for-NULL-__dso_handle.patch \
         "