Auto merge of rust-lang#43972 - TobiasSchaffner:std_clean, r=alexcric…

…hton

 Add the libstd-modifications needed for the L4Re target

This commit adds the needed modifications to compile the std crate for the L4 Runtime environment (L4Re).

A target for the L4Re was introduced in commit: c151220

In many aspects implementations for linux also apply for the L4Re microkernel.

Some uncommon characteristics had to be resolved:
 * L4Re has no network funktionality
 * L4Re has a maximum stacksize of 1Mb for threads
 * L4Re has no uid or gid

Co-authored-by: Sebastian Humenda <sebastian.humenda@tu-dresden.de>

src/libstd/os/mod.rs

@@ -27,7 +27,7 @@ pub use sys::unix_ext as unix;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use sys::windows_ext as windows;
 
-#[cfg(any(dox, target_os = "linux"))]
+#[cfg(any(dox, target_os = "linux", target_os = "l4re"))]
 #[doc(cfg(target_os = "linux"))]
 pub mod linux;
 

src/libstd/os/raw.rs

@@ -21,6 +21,7 @@ use fmt;
                                        target_arch = "s390x")),
           all(target_os = "android", any(target_arch = "aarch64",
                                          target_arch = "arm")),
+          all(target_os = "l4re", target_arch = "x86_64"),
           all(target_os = "fuchsia", target_arch = "aarch64")))]
 #[stable(feature = "raw_os", since = "1.1.0")] pub type c_char = u8;
 #[cfg(not(any(all(target_os = "linux", any(target_arch = "aarch64",
@@ -30,6 +31,7 @@ use fmt;
                                            target_arch = "s390x")),
               all(target_os = "android", any(target_arch = "aarch64",
                                              target_arch = "arm")),
+              all(target_os = "l4re", target_arch = "x86_64"),
               all(target_os = "fuchsia", target_arch = "aarch64"))))]
 #[stable(feature = "raw_os", since = "1.1.0")] pub type c_char = i8;
 #[stable(feature = "raw_os", since = "1.1.0")] pub type c_schar = i8;

src/libstd/sys/redox/thread.rs

@@ -16,6 +16,8 @@ use sys_common::thread::start_thread;
 use sys::{cvt, syscall};
 use time::Duration;
 
+pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
+
 pub struct Thread {
     id: usize,
 }

src/libstd/sys/unix/args.rs

@@ -65,6 +65,7 @@ impl DoubleEndedIterator for Args {
           target_os = "solaris",
           target_os = "emscripten",
           target_os = "haiku",
+          target_os = "l4re",
           target_os = "fuchsia"))]
 mod imp {
     use os::unix::prelude::*;

src/libstd/sys/unix/condvar.rs

@@ -38,10 +38,16 @@ impl Condvar {
         Condvar { inner: UnsafeCell::new(libc::PTHREAD_COND_INITIALIZER) }
     }
 
-    #[cfg(any(target_os = "macos", target_os = "ios", target_os = "android"))]
+    #[cfg(any(target_os = "macos",
+              target_os = "ios",
+              target_os = "l4re",
+              target_os = "android"))]
     pub unsafe fn init(&mut self) {}
 
-    #[cfg(not(any(target_os = "macos", target_os = "ios", target_os = "android")))]
+    #[cfg(not(any(target_os = "macos",
+                  target_os = "ios",
+                  target_os = "l4re",
+                  target_os = "android")))]
     pub unsafe fn init(&mut self) {
         use mem;
         let mut attr: libc::pthread_condattr_t = mem::uninitialized();

src/libstd/sys/unix/env.rs

@@ -182,3 +182,14 @@ pub mod os {
     pub const EXE_SUFFIX: &'static str = "";
     pub const EXE_EXTENSION: &'static str = "";
 }
+
+#[cfg(target_os = "l4re")]
+pub mod os {
+    pub const FAMILY: &'static str = "unix";
+    pub const OS: &'static str = "l4re";
+    pub const DLL_PREFIX: &'static str = "lib";
+    pub const DLL_SUFFIX: &'static str = ".so";
+    pub const DLL_EXTENSION: &'static str = "so";
+    pub const EXE_SUFFIX: &'static str = "";
+    pub const EXE_EXTENSION: &'static str = "";
+}

src/libstd/sys/unix/fd.rs

@@ -144,6 +144,7 @@ impl FileDesc {
                   target_os = "solaris",
                   target_os = "emscripten",
                   target_os = "fuchsia",
+                  target_os = "l4re",
                   target_os = "haiku")))]
     pub fn set_cloexec(&self) -> io::Result<()> {
         unsafe {
@@ -155,6 +156,7 @@ impl FileDesc {
               target_os = "solaris",
               target_os = "emscripten",
               target_os = "fuchsia",
+              target_os = "l4re",
               target_os = "haiku"))]
     pub fn set_cloexec(&self) -> io::Result<()> {
         unsafe {

src/libstd/sys/unix/fs.rs

@@ -23,19 +23,21 @@ use sys::time::SystemTime;
 use sys::{cvt, cvt_r};
 use sys_common::{AsInner, FromInner};
 
-#[cfg(any(target_os = "linux", target_os = "emscripten"))]
+#[cfg(any(target_os = "linux", target_os = "emscripten", target_os = "l4re"))]
 use libc::{stat64, fstat64, lstat64, off64_t, ftruncate64, lseek64, dirent64, readdir64_r, open64};
 #[cfg(target_os = "android")]
 use libc::{stat as stat64, fstat as fstat64, lstat as lstat64, lseek64,
            dirent as dirent64, open as open64};
 #[cfg(not(any(target_os = "linux",
               target_os = "emscripten",
+              target_os = "l4re",
               target_os = "android")))]
 use libc::{stat as stat64, fstat as fstat64, lstat as lstat64, off_t as off64_t,
            ftruncate as ftruncate64, lseek as lseek64, dirent as dirent64, open as open64};
 #[cfg(not(any(target_os = "linux",
               target_os = "emscripten",
               target_os = "solaris",
+              target_os = "l4re",
               target_os = "fuchsia")))]
 use libc::{readdir_r as readdir64_r};
 
@@ -316,6 +318,7 @@ impl DirEntry {
               target_os = "android",
               target_os = "solaris",
               target_os = "haiku",
+              target_os = "l4re",
               target_os = "fuchsia"))]
     pub fn ino(&self) -> u64 {
         self.entry.d_ino as u64
@@ -346,6 +349,7 @@ impl DirEntry {
     #[cfg(any(target_os = "android",
               target_os = "linux",
               target_os = "emscripten",
+              target_os = "l4re",
               target_os = "haiku"))]
     fn name_bytes(&self) -> &[u8] {
         unsafe {