rustbuild: Optimize build times slightly

As the entry point for building the Rust compiler, a good user experience hinges
on this compiling quickly to get to the meat of the problem. To that end use
`#[cfg]`-specific dependencies to avoid building Windows crates on Unix and drop
the `regex` crate for now which was easily replacable with some string
searching.

5 files changed, 32 insertions, 115 deletions

diff --git a/src/Cargo.lock b/src/Cargo.lock
index ecd94e5b7e9..a32ba02457e 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -7,14 +7,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "aho-corasick"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "alloc"
 version = "0.0.0"
 dependencies = [
@@ -56,7 +48,6 @@ dependencies = [
  "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "md5 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.1.73 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.1.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -99,7 +90,7 @@ dependencies = [
 name = "compiletest"
 version = "0.0.0"
 dependencies = [
- "env_logger 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "env_logger 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serialize 0.0.0",
 ]
@@ -110,11 +101,10 @@ version = "0.0.0"
 
 [[package]]
 name = "env_logger"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.1.73 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -222,14 +212,6 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "memchr"
-version = "0.1.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "num_cpus"
 version = "0.2.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -280,23 +262,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "regex"
-version = "0.1.73"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "aho-corasick 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "thread_local 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "regex-syntax"
-version = "0.3.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
 name = "rustbook"
 version = "0.0.0"
 
@@ -721,23 +686,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "thread-id"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "thread_local"
-version = "0.2.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "tidy"
 version = "0.1.0"
 
@@ -772,11 +720,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "utf8-ranges"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
 name = "winapi"
 version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -787,9 +730,8 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [metadata]
-"checksum aho-corasick 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2b3fb52b09c1710b961acb35390d514be82e4ac96a9969a8e38565a29b878dc9"
 "checksum cmake 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)" = "dfcf5bcece56ef953b8ea042509e9dcbdfe97820b7e20d86beb53df30ed94978"
-"checksum env_logger 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "82dcb9ceed3868a03b335657b85a159736c961900f7e7747d3b0b97b9ccb5ccb"
+"checksum env_logger 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "15abd780e45b3ea4f76b4e9a26ff4843258dd8a3eed2775a0e7368c2e7936c2f"
 "checksum filetime 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "5363ab8e4139b8568a6237db5248646e5a8a2f89bd5ccb02092182b11fd3e922"
 "checksum gcc 0.3.35 (git+https://github.com/alexcrichton/gcc-rs)" = "<none>"
 "checksum gcc 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)" = "91ecd03771effb0c968fd6950b37e89476a578aaf1c70297d8e92b6516ec3312"
@@ -800,17 +742,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "ab83497bf8bf4ed2a74259c1c802351fcd67a65baa86394b6ba73c36f4838054"
 "checksum matches 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "15305656809ce5a4805b1ff2946892810992197ce1270ff79baded852187942e"
 "checksum md5 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a5539a8dee9b4ae308c9c406a379838b435a8f2c84cf9fedc6d5a576be9888db"
-"checksum memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d8b629fb514376c675b98c1421e80b151d3817ac42d7c667717d282761418d20"
 "checksum num_cpus 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)" = "cee7e88156f3f9e19bdd598f8d6c9db7bf4078f99f8381f43a55b09648d1a6e3"
-"checksum regex 0.1.73 (registry+https://github.com/rust-lang/crates.io-index)" = "56b7ee9f764ecf412c6e2fff779bca4b22980517ae335a21aeaf4e32625a5df2"
-"checksum regex-syntax 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "31040aad7470ad9d8c46302dcffba337bb4289ca5da2e3cd6e37b64109a85199"
 "checksum rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)" = "6159e4e6e559c81bd706afe9c8fd68f547d3e851ce12e76b1de7914bab61691b"
-"checksum thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a9539db560102d1cef46b8b78ce737ff0bb64e7e18d35b2a5688f7d097d0ff03"
-"checksum thread_local 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "55dd963dbaeadc08aa7266bf7f91c3154a7805e32bb94b820b769d2ef3b4744d"
 "checksum toml 0.1.30 (registry+https://github.com/rust-lang/crates.io-index)" = "0590d72182e50e879c4da3b11c6488dae18fccb1ae0c7a3eda18e16795844796"
 "checksum unicode-bidi 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c1f7ceb96afdfeedee42bade65a0d585a6a0106f681b6749c8ff4daa8df30b3f"
 "checksum unicode-normalization 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "26643a2f83bac55f1976fb716c10234485f9202dcd65cfbdf9da49867b271172"
 "checksum url 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "afe9ec54bc4db14bc8744b7fed060d785ac756791450959b2248443319d5b119"
-"checksum utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
diff --git a/src/bootstrap/Cargo.toml b/src/bootstrap/Cargo.toml
index b19545590b9..c9669075438 100644
--- a/src/bootstrap/Cargo.toml
+++ b/src/bootstrap/Cargo.toml
@@ -27,9 +27,10 @@ num_cpus = "0.2"
 toml = "0.1"
 getopts = "0.2"
 rustc-serialize = "0.3"
-winapi = "0.2"
-kernel32-sys = "0.2"
 gcc = { git = "https://github.com/alexcrichton/gcc-rs" }
 libc = "0.2"
 md5 = "0.1"
-regex = "0.1.73"
+
+[target.'cfg(windows)'.dependencies]
+winapi = "0.2"
+kernel32-sys = "0.2"
diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs
index 465abf15750..8676f5cc4a1 100644
--- a/src/bootstrap/dist.rs
+++ b/src/bootstrap/dist.rs
@@ -25,7 +25,6 @@ use std::process::Command;
 
 use {Build, Compiler};
 use util::{cp_r, libdir, is_dylib, cp_filtered, copy};
-use regex::{RegexSet, quote};
 
 pub fn package_vers(build: &Build) -> &str {
     match &build.config.channel[..] {
@@ -315,49 +314,31 @@ pub fn rust_src(build: &Build) {
         "mk"
     ];
 
-    // Exclude paths matching these wildcard expressions
-    let excludes = [
-        // exclude-vcs
-        "CVS", "RCS", "SCCS", ".git", ".gitignore", ".gitmodules", ".gitattributes", ".cvsignore",
-        ".svn", ".arch-ids", "{arch}", "=RELEASE-ID", "=meta-update", "=update", ".bzr",
-        ".bzrignore", ".bzrtags", ".hg", ".hgignore", ".hgrags", "_darcs",
-        // extensions
-        "*~", "*.pyc",
-        // misc
-        "llvm/test/*/*.ll",
-        "llvm/test/*/*.td",
-        "llvm/test/*/*.s",
-        "llvm/test/*/*/*.ll",
-        "llvm/test/*/*/*.td",
-        "llvm/test/*/*/*.s"
-    ];
-
-    // Construct a set of regexes for efficiently testing whether paths match one of the above
-    // expressions.
-    let regex_set = t!(RegexSet::new(
-        // This converts a wildcard expression to a regex
-        excludes.iter().map(|&s| {
-            // Prefix ensures that matching starts on a path separator boundary
-            r"^(.*[\\/])?".to_owned() + (
-                // Escape the expression to produce a regex matching exactly that string
-                &quote(s)
-                // Replace slashes with a pattern matching either forward or backslash
-                .replace(r"/", r"[\\/]")
-                // Replace wildcards with a pattern matching a single path segment, ie. containing
-                // no slashes.
-                .replace(r"\*", r"[^\\/]*")
-            // Suffix anchors to the end of the path
-            ) + "$"
-        })
-    ));
-
-    // Create a filter which skips files which match the regex set or contain invalid unicode
     let filter_fn = move |path: &Path| {
-        if let Some(path) = path.to_str() {
-            !regex_set.is_match(path)
-        } else {
-            false
+        let spath = match path.to_str() {
+            Some(path) => path,
+            None => return false,
+        };
+        if spath.ends_with("~") || spath.ends_with(".pyc") {
+            return false
         }
+        if spath.contains("llvm/test") || spath.contains("llvm\\test") {
+            if spath.ends_with(".ll") ||
+               spath.ends_with(".td") ||
+               spath.ends_with(".s") {
+                return false
+            }
+        }
+
+        let excludes = [
+            "CVS", "RCS", "SCCS", ".git", ".gitignore", ".gitmodules",
+            ".gitattributes", ".cvsignore", ".svn", ".arch-ids", "{arch}",
+            "=RELEASE-ID", "=meta-update", "=update", ".bzr", ".bzrignore",
+            ".bzrtags", ".hg", ".hgignore", ".hgrags", "_darcs",
+        ];
+        !path.iter()
+             .map(|s| s.to_str().unwrap())
+             .any(|s| excludes.contains(&s))
     };
 
     // Copy the directories using our filter
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index 9ffc433cd78..12938b8326e 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -26,7 +26,6 @@ extern crate md5;
 extern crate num_cpus;
 extern crate rustc_serialize;
 extern crate toml;
-extern crate regex;
 
 use std::collections::HashMap;
 use std::env;
diff --git a/src/tools/compiletest/Cargo.toml b/src/tools/compiletest/Cargo.toml
index 573ee388866..e05d57365f8 100644
--- a/src/tools/compiletest/Cargo.toml
+++ b/src/tools/compiletest/Cargo.toml
@@ -12,5 +12,5 @@ opt-level = 2
 
 [dependencies]
 log = "0.3"
-env_logger = "0.3"
-serialize = { path = "../../libserialize" }
\ No newline at end of file
+env_logger = { version = "0.3.5", default-features = false }
+serialize = { path = "../../libserialize" }