Rollup merge of #39431 - alexcrichton:no-more-makefiles, r=brson

Delete the makefile build system

This PR deletes the makefile build system in favor of the rustbuild build system. The beta has now been branched so 1.16 will continue to be buildable from the makefiles, but going forward 1.17 will only be buildable with rustbuild.

Rustbuild has been the default build system [since 1.15.0](rust-lang/rust#37817) and the makefiles were [proposed for deletion](https://internals.rust-lang.org/t/proposal-for-promoting-rustbuild-to-official-status/4368) at this time back in November of last year.

And now with the deletion of these makefiles we can start getting those sweet sweet improvements of using crates.io crates in the compiler!

src/build.rs

@@ -21,7 +21,6 @@ use std::process::Command;
 use build_helper::{run, rerun_if_changed_anything_in_dir, up_to_date};
 
 fn main() {
-    println!("cargo:rustc-cfg=cargobuild");
     println!("cargo:rerun-if-changed=build.rs");
 
     let target = env::var("TARGET").expect("TARGET was not set");

src/lib.rs

@@ -464,9 +464,6 @@ mod panicking;
 mod rand;
 mod memchr;
 
-// This module just defines per-platform native library dependencies
-mod rtdeps;
-
 // The runtime entry point and a few unstable public functions used by the
 // compiler
 pub mod rt;

src/panicking.rs

@@ -311,12 +311,12 @@ impl<'a> Location<'a> {
 }
 
 fn default_hook(info: &PanicInfo) {
-    #[cfg(any(not(cargobuild), feature = "backtrace"))]
+    #[cfg(feature = "backtrace")]
     use sys_common::backtrace;
 
     // If this is a double panic, make sure that we print a backtrace
     // for this panic. Otherwise only print it if logging is enabled.
-    #[cfg(any(not(cargobuild), feature = "backtrace"))]
+    #[cfg(feature = "backtrace")]
     let log_backtrace = {
         let panics = update_panic_count(0);
 
@@ -341,7 +341,7 @@ fn default_hook(info: &PanicInfo) {
         let _ = writeln!(err, "thread '{}' panicked at '{}', {}:{}",
                          name, msg, file, line);
 
-        #[cfg(any(not(cargobuild), feature = "backtrace"))]
+        #[cfg(feature = "backtrace")]
         {
             use sync::atomic::{AtomicBool, Ordering};
 

src/sys/unix/args.rs

@@ -189,11 +189,6 @@ mod imp {
             fn objc_msgSend_ul(obj: NsId, sel: Sel, ...) -> NsId;
         }
 
-        #[link(name = "Foundation", kind = "framework")]
-        #[link(name = "objc")]
-        #[cfg(not(cargobuild))]
-        extern {}
-
         type Sel = *const libc::c_void;
         type NsId = *const libc::c_void;
 

src/sys/unix/mod.rs

@@ -33,7 +33,7 @@ pub mod weak;
 
 pub mod args;
 pub mod android;
-#[cfg(any(not(cargobuild), feature = "backtrace"))]
+#[cfg(feature = "backtrace")]
 pub mod backtrace;
 pub mod condvar;
 pub mod env;

src/sys/unix/rand.rs

@@ -257,10 +257,6 @@ mod imp {
     #[allow(non_upper_case_globals)]
     const kSecRandomDefault: *const SecRandom = ptr::null();
 
-    #[link(name = "Security", kind = "framework")]
-    #[cfg(not(cargobuild))]
-    extern {}
-
     extern {
         fn SecRandomCopyBytes(rnd: *const SecRandom,
                               count: size_t, bytes: *mut u8) -> c_int;

src/sys/windows/c.rs

@@ -833,13 +833,6 @@ pub struct CONSOLE_READCONSOLE_CONTROL {
 }
 pub type PCONSOLE_READCONSOLE_CONTROL = *mut CONSOLE_READCONSOLE_CONTROL;
 
-#[link(name = "ws2_32")]
-#[link(name = "userenv")]
-#[link(name = "shell32")]
-#[link(name = "advapi32")]
-#[cfg(not(cargobuild))]
-extern {}
-
 extern "system" {
     pub fn WSAStartup(wVersionRequested: WORD,
                       lpWSAData: LPWSADATA) -> c_int;

src/sys_common/gnu/libbacktrace.rs

@@ -39,9 +39,6 @@ pub fn print(w: &mut Write, idx: isize, addr: *mut libc::c_void,
                       msg: *const libc::c_char,
                       errnum: libc::c_int);
     enum backtrace_state {}
-    #[link(name = "backtrace", kind = "static")]
-    #[cfg(all(not(test), not(cargobuild)))]
-    extern {}
 
     extern {
         fn backtrace_create_state(filename: *const libc::c_char,

src/sys_common/mod.rs

@@ -29,7 +29,7 @@ use sync::Once;
 use sys;
 
 pub mod at_exit_imp;
-#[cfg(any(not(cargobuild), feature = "backtrace"))]
+#[cfg(feature = "backtrace")]
 pub mod backtrace;
 pub mod condvar;
 pub mod io;
@@ -50,7 +50,7 @@ pub use sys::net;
 #[cfg(not(target_os = "redox"))]
 pub mod net;
 
-#[cfg(any(not(cargobuild), feature = "backtrace"))]
+#[cfg(feature = "backtrace")]
 #[cfg(any(all(unix, not(any(target_os = "macos", target_os = "ios", target_os = "emscripten"))),
           all(windows, target_env = "gnu")))]
 pub mod gnu;