Replace libbacktrace with a submodule

While we're at it update the `backtrace` crate from crates.io. It turns out that
the submodule's configure script has gotten a lot more finnicky as of late so
also switch over to using the `cc` crate manually which allows to avoid some
hacks around the configure script as well

Author: alexcrichton

.gitmodules

@@ -53,3 +53,6 @@
 [submodule "src/tools/lld"]
 	path = src/tools/lld
 	url = https://github.com/rust-lang/lld.git
+[submodule "src/libbacktrace"]
+	path = src/libbacktrace
+	url = https://github.com/rust-lang-nursery/libbacktrace

src/Cargo.lock

@@ -105,7 +105,7 @@ name = "backtrace"
 version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace-sys 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-demangle 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -114,11 +114,12 @@ dependencies = [
 
 [[package]]
 name = "backtrace-sys"
-version = "0.1.16"
+version = "0.1.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2513,6 +2514,7 @@ dependencies = [
  "alloc_jemalloc 0.0.0",
  "alloc_system 0.0.0",
  "build_helper 0.1.0",
+ "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "compiler_builtins 0.0.0",
  "core 0.0.0",
  "libc 0.0.0",
@@ -3051,7 +3053,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum assert_cli 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5da59dbd8df54562665b925b427221ceda9b771408cb8a6cbd2125d3b001330b"
 "checksum atty 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "af80143d6f7608d746df1520709e5d141c96f240b0e62b0aa41bdfb53374d9d4"
 "checksum backtrace 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "ebbe525f66f42d207968308ee86bc2dd60aa5fab535b22e616323a173d097d8e"
-"checksum backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "44585761d6161b0f57afc49482ab6bd067e4edef48c12a152c237eb0203f7661"
+"checksum backtrace-sys 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)" = "5fd343a2466c4603f76f38de264bc0526cffc7fa38ba52fb9f13237eccc1ced2"
 "checksum bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "aad18937a628ec6abcd26d1489012cc0e18c21798210f491af69ded9b881106d"
 "checksum bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4efd02e230a02e18f92fc2735f44597385ed02ad8f831e7c1c1156ee5e1ab3a5"
 "checksum bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b3c30d3802dfb7281680d6285f2ccdaa8c2d8fee41f93805dba5c4cf50dc23cf"

src/libbacktrace

@@ -39,6 +39,7 @@ rustc_msan = { path = "../librustc_msan" }
 rustc_tsan = { path = "../librustc_tsan" }
 
 [build-dependencies]
+cc = "1.0"
 build_helper = { path = "../build_helper" }
 
 [features]

src/libstd/Cargo.toml

@@ -11,22 +11,22 @@
 #![deny(warnings)]
 
 extern crate build_helper;
+extern crate cc;
 
+use build_helper::native_lib_boilerplate;
 use std::env;
-use std::process::Command;
-use build_helper::{run, native_lib_boilerplate};
+use std::fs::File;
 
 fn main() {
     let target = env::var("TARGET").expect("TARGET was not set");
-    let host = env::var("HOST").expect("HOST was not set");
     if cfg!(feature = "backtrace") &&
         !target.contains("cloudabi") &&
         !target.contains("emscripten") &&
         !target.contains("fuchsia") &&
         !target.contains("msvc") &&
         !target.contains("wasm32")
     {
-        let _ = build_libbacktrace(&host, &target);
+        let _ = build_libbacktrace(&target);
     }
 
     if target.contains("linux") {
@@ -84,26 +84,55 @@ fn main() {
     }
 }
 
-fn build_libbacktrace(host: &str, target: &str) -> Result<(), ()> {
-    let native = native_lib_boilerplate("libbacktrace", "libbacktrace", "backtrace", ".libs")?;
-    let cflags = env::var("CFLAGS").unwrap_or_default() + " -fvisibility=hidden -O2";
+fn build_libbacktrace(target: &str) -> Result<(), ()> {
+    let native = native_lib_boilerplate("libbacktrace", "libbacktrace", "backtrace", "")?;
 
-    run(Command::new("sh")
-                .current_dir(&native.out_dir)
-                .arg(native.src_dir.join("configure").to_str().unwrap()
-                                   .replace("C:\\", "/c/")
-                                   .replace("\\", "/"))
-                .arg("--with-pic")
-                .arg("--disable-multilib")
-                .arg("--disable-shared")
-                .arg("--disable-host-shared")
-                .arg(format!("--host={}", build_helper::gnu_target(target)))
-                .arg(format!("--build={}", build_helper::gnu_target(host)))
-                .env("CFLAGS", cflags));
+    let mut build = cc::Build::new();
+    build
+        .flag("-fvisibility=hidden")
+        .include("../libbacktrace")
+        .include(&native.out_dir)
+        .out_dir(&native.out_dir)
+        .warnings(false)
+        .file("../libbacktrace/alloc.c")
+        .file("../libbacktrace/backtrace.c")
+        .file("../libbacktrace/dwarf.c")
+        .file("../libbacktrace/fileline.c")
+        .file("../libbacktrace/posix.c")
+        .file("../libbacktrace/read.c")
+        .file("../libbacktrace/sort.c")
+        .file("../libbacktrace/state.c");
 
-    run(Command::new(build_helper::make(host))
-                .current_dir(&native.out_dir)
-                .arg(format!("INCDIR={}", native.src_dir.display()))
-                .arg("-j").arg(env::var("NUM_JOBS").expect("NUM_JOBS was not set")));
+    if target.contains("darwin") {
+        build.file("../libbacktrace/macho.c");
+    } else if target.contains("windows") {
+        build.file("../libbacktrace/pecoff.c");
+    } else {
+        build.file("../libbacktrace/elf.c");
+
+        if target.contains("64") {
+            build.define("BACKTRACE_ELF_SIZE", "64");
+        } else {
+            build.define("BACKTRACE_ELF_SIZE", "32");
+        }
+    }
+
+    File::create(native.out_dir.join("backtrace-supported.h")).unwrap();
+    build.define("BACKTRACE_SUPPORTED", "1");
+    build.define("BACKTRACE_USES_MALLOC", "1");
+    build.define("BACKTRACE_SUPPORTS_THREADS", "0");
+    build.define("BACKTRACE_SUPPORTS_DATA", "0");
+
+    File::create(native.out_dir.join("config.h")).unwrap();
+    if !target.contains("apple-ios") &&
+       !target.contains("solaris") &&
+       !target.contains("redox") &&
+       !target.contains("android") {
+        build.define("HAVE_DL_ITERATE_PHDR", "1");
+    }
+    build.define("_GNU_SOURCE", "1");
+    build.define("_LARGE_FILES", "1");
+
+    build.compile("backtrace");
     Ok(())
 }

src/libstd/build.rs

@@ -98,6 +98,7 @@ static WHITELIST: &'static [Crate] = &[
     Crate("parking_lot"),
     Crate("parking_lot_core"),
     Crate("polonius-engine"),
+    Crate("pkg-config"),
     Crate("quick-error"),
     Crate("rand"),
     Crate("redox_syscall"),