Rollup merge of rust-lang#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#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!

Author: frewsxcv

.travis.yml

@@ -33,7 +33,6 @@ matrix:
     - env: IMAGE=x86_64-gnu-aux
     - env: IMAGE=x86_64-gnu-debug
     - env: IMAGE=x86_64-gnu-nopt
-    - env: IMAGE=x86_64-gnu-make
     - env: IMAGE=x86_64-gnu-llvm-3.7 ALLOW_PR=1 RUST_BACKTRACE=1
     - env: IMAGE=x86_64-gnu-distcheck
     - env: IMAGE=x86_64-gnu-incremental
@@ -57,13 +56,6 @@ matrix:
       os: osx
       osx_image: xcode8.2
       install: *osx_install_sccache
-    - env: >
-        RUST_CHECK_TARGET=check
-        RUST_CONFIGURE_ARGS=--build=x86_64-apple-darwin --disable-rustbuild
-        SRC=.
-      os: osx
-      osx_image: xcode8.2
-      install: *osx_install_sccache
     - env: >
         RUST_CHECK_TARGET=dist
         RUST_CONFIGURE_ARGS="--target=aarch64-apple-ios,armv7-apple-ios,armv7s-apple-ios,i386-apple-ios,x86_64-apple-ios --enable-extended"

CONTRIBUTING.md

@@ -93,11 +93,6 @@ system internals, try asking in [`#rust-internals`][pound-rust-internals].
 
 [bootstrap]: https://github.com/rust-lang/rust/tree/master/src/bootstrap/
 
-> **Note**: the build system was recently rewritten from a jungle of makefiles
-> to the current incarnation you'll see in `src/bootstrap`. If you experience
-> bugs you can temporarily revert back to the makefiles with
-> `--disable-rustbuild` passed to `./configure`.
-
 ### Configuration
 
 Before you can start building the compiler you need to configure the build for

Makefile.in

@@ -15,11 +15,6 @@ environment:
     SCRIPT: python x.py test --host i686-pc-windows-msvc --target i686-pc-windows-msvc && python x.py dist
     DEPLOY: 1
 
-  # MSVC makefiles
-  - MSYS_BITS: 64
-    RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-msvc --disable-rustbuild
-    RUST_CHECK_TARGET: check
-
   # MSVC cargotest
   - MSYS_BITS: 64
     NO_VENDOR: 1
@@ -58,13 +53,6 @@ environment:
     MINGW_DIR: mingw32
     DEPLOY: 1
 
-  - MSYS_BITS: 32
-    RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu --disable-rustbuild
-    RUST_CHECK_TARGET: check
-    MINGW_URL: https://s3.amazonaws.com/rust-lang-ci
-    MINGW_ARCHIVE: i686-4.9.2-release-win32-dwarf-rt_v4-rev4.7z
-    MINGW_DIR: mingw32
-
   - MSYS_BITS: 64
     SCRIPT: python x.py test && python x.py dist
     RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu --enable-extended