Add support for i686-unknown-linux-musl

mk/cfg/i686-unknown-linux-musl.mk

@@ -0,0 +1,28 @@
+# i686-unknown-linux-musl configuration
+CC_i686-unknown-linux-musl=$(CFG_MUSL_ROOT)/bin/musl-gcc
+CXX_i686-unknown-linux-musl=notaprogram
+CPP_i686-unknown-linux-musl=$(CFG_MUSL_ROOT)/bin/musl-gcc -E
+AR_i686-unknown-linux-musl=$(AR)
+CFG_INSTALL_ONLY_RLIB_i686-unknown-linux-musl = 1
+CFG_LIB_NAME_i686-unknown-linux-musl=lib$(1).so
+CFG_STATIC_LIB_NAME_i686-unknown-linux-musl=lib$(1).a
+CFG_LIB_GLOB_i686-unknown-linux-musl=lib$(1)-*.so
+CFG_JEMALLOC_CFLAGS_i686-unknown-linux-musl := -m32 -Wl,-melf_i386
+CFG_GCCISH_CFLAGS_i686-unknown-linux-musl := -Wall -Werror -g -fPIC -m32 -Wl,-melf_i386
+CFG_GCCISH_CXXFLAGS_i686-unknown-linux-musl :=
+CFG_GCCISH_LINK_FLAGS_i686-unknown-linux-musl :=
+CFG_GCCISH_DEF_FLAG_i686-unknown-linux-musl :=
+CFG_LLC_FLAGS_i686-unknown-linux-musl :=
+CFG_INSTALL_NAME_i686-unknown-linux-musl =
+CFG_EXE_SUFFIX_i686-unknown-linux-musl =
+CFG_WINDOWSY_i686-unknown-linux-musl :=
+CFG_UNIXY_i686-unknown-linux-musl := 1
+CFG_LDPATH_i686-unknown-linux-musl :=
+CFG_RUN_i686-unknown-linux-musl=$(2)
+CFG_RUN_TARG_i686-unknown-linux-musl=$(call CFG_RUN_i686-unknown-linux-musl,,$(2))
+CFG_GNU_TRIPLE_i686-unknown-linux-musl := i686-unknown-linux-musl
+CFG_THIRD_PARTY_OBJECTS_i686-unknown-linux-musl := crt1.o crti.o crtn.o
+CFG_INSTALLED_OBJECTS_i686-unknown-linux-musl := crt1.o crti.o crtn.o
+
+NATIVE_DEPS_libc_T_i686-unknown-linux-musl += libc.a
+NATIVE_DEPS_std_T_i686-unknown-linux-musl += libunwind.a crt1.o crti.o crtn.o

mk/main.mk

@@ -361,6 +361,9 @@ export CFG_DISABLE_UNSTABLE_FEATURES
 export RUSTC_BOOTSTRAP_KEY:=$(CFG_BOOTSTRAP_KEY)
 endif
 export CFG_BOOTSTRAP_KEY
+ifdef CFG_MUSL_ROOT
+export CFG_MUSL_ROOT
+endif
 
 ######################################################################
 # Per-stage targets and runner

src/librustc_back/target/i686_unknown_linux_musl.rs

@@ -0,0 +1,46 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// See x86_64_unknown_linux_musl for explanation of arguments
+
+use target::Target;
+
+pub fn target() -> Target {
+    let mut base = super::linux_base::opts();
+    base.cpu = "pentium4".to_string();
+    base.pre_link_args.push("-m32".to_string());
+    base.pre_link_args.push("-Wl,-melf_i386".to_string());
+
+    base.pre_link_args.push("-nostdlib".to_string());
+    base.pre_link_args.push("-static".to_string());
+    base.pre_link_args.push("-Wl,--eh-frame-hdr".to_string());
+
+    base.pre_link_args.push("-Wl,-(".to_string());
+    base.post_link_args.push("-Wl,-)".to_string());
+
+    base.pre_link_objects_exe.push("crt1.o".to_string());
+    base.pre_link_objects_exe.push("crti.o".to_string());
+    base.post_link_objects.push("crtn.o".to_string());
+
+    base.dynamic_linking = false;
+    base.has_rpath = false;
+    base.position_independent_executables = false;
+
+    Target {
+        llvm_target: "i686-unknown-linux-musl".to_string(),
+        target_endian: "little".to_string(),
+        target_pointer_width: "32".to_string(),
+        arch: "x86".to_string(),
+        target_os: "linux".to_string(),
+        target_env: "musl".to_string(),
+        target_vendor: "unknown".to_string(),
+        options: base,
+    }
+}

src/librustc_back/target/mod.rs

@@ -431,6 +431,7 @@ impl Target {
             armv7_unknown_linux_gnueabihf,
             aarch64_unknown_linux_gnu,
             x86_64_unknown_linux_musl,
+            i686_unknown_linux_musl,
             mips_unknown_linux_musl,
             mipsel_unknown_linux_musl,
 

src/libstd/sys/unix/thread.rs

@@ -168,7 +168,7 @@ impl Drop for Thread {
     }
 }
 
-#[cfg(all(not(target_os = "linux"),
+#[cfg(all(not(all(target_os = "linux", not(target_env = "musl"))),
           not(target_os = "macos"),
           not(target_os = "bitrig"),
           not(all(target_os = "netbsd", not(target_vendor = "rumprun"))),
@@ -181,7 +181,7 @@ pub mod guard {
 }
 
 
-#[cfg(any(target_os = "linux",
+#[cfg(any(all(target_os = "linux", not(target_env = "musl")),
           target_os = "macos",
           target_os = "bitrig",
           all(target_os = "netbsd", not(target_vendor = "rumprun")),