linux-and-clang

.travis.yml

@@ -230,7 +230,10 @@ install:
           travis_retry curl -fo /usr/local/bin/sccache https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror/2018-04-02-sccache-x86_64-apple-darwin &&
             chmod +x /usr/local/bin/sccache &&
           travis_retry curl -fo /usr/local/bin/stamp https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror/2017-03-17-stamp-x86_64-apple-darwin &&
-            chmod +x /usr/local/bin/stamp
+            chmod +x /usr/local/bin/stamp &&
+          travis_retry curl -O http://releases.llvm.org/6.0.0/clang+llvm-6.0.0-x86_64-apple-darwin.tar.xz | tar xJf - &&
+            export CC=`pwd`/clang+llvm-6.0.0-x86_64-apple-darwin/bin/clang &&
+            export CXX=`pwd`/clang+llvm-6.0.0-x86_64-apple-darwin/bin/clang++
           ;;
     esac
 

src/ci/docker/dist-x86_64-linux/Dockerfile

@@ -29,7 +29,7 @@ ENV PATH=/rustroot/bin:$PATH
 ENV LD_LIBRARY_PATH=/rustroot/lib64:/rustroot/lib
 ENV PKG_CONFIG_PATH=/rustroot/lib/pkgconfig
 WORKDIR /tmp
-COPY dist-x86_64-linux/shared.sh dist-x86_64-linux/build-binutils.sh /tmp/
+COPY dist-x86_64-linux/shared.sh /tmp/
 
 # We need a build of openssl which supports SNI to download artifacts from
 # static.rust-lang.org. This'll be used to link into libcurl below (and used
@@ -51,26 +51,33 @@ RUN ./build-curl.sh
 # immediately segfault in Rust, so we need to install our own binutils.
 #
 # See https://github.com/rust-lang/rust/issues/20440 for more info
+COPY dist-x86_64-linux/build-binutils.sh /tmp/
 RUN ./build-binutils.sh
 
-# Need a newer version of gcc than centos has to compile LLVM nowadays
+# libssh2 (a dependency of Cargo) requires cmake 2.8.11 or higher but CentOS
+# only has 2.6.4, so build our own
+COPY dist-x86_64-linux/build-cmake.sh /tmp/
+RUN ./build-cmake.sh
+
+# Build a version of gcc capable of building LLVM 6
 COPY dist-x86_64-linux/build-gcc.sh /tmp/
 RUN ./build-gcc.sh
 
 # CentOS 5.5 has Python 2.4 by default, but LLVM needs 2.7+
 COPY dist-x86_64-linux/build-python.sh /tmp/
 RUN ./build-python.sh
 
+# Now build LLVM+Clang 6, afterwards configuring further compilations to use the
+# clang/clang++ compilers.
+COPY dist-x86_64-linux/build-clang.sh /tmp/
+RUN ./build-clang.sh
+ENV CC=clang CXX=clang++
+
 # Apparently CentOS 5.5 desn't have `git` in yum, but we're gonna need it for
 # cloning, so download and build it here.
 COPY dist-x86_64-linux/build-git.sh /tmp/
 RUN ./build-git.sh
 
-# libssh2 (a dependency of Cargo) requires cmake 2.8.11 or higher but CentOS
-# only has 2.6.4, so build our own
-COPY dist-x86_64-linux/build-cmake.sh /tmp/
-RUN ./build-cmake.sh
-
 # for sanitizers, we need kernel headers files newer than the ones CentOS ships
 # with so we install newer ones here
 COPY dist-x86_64-linux/build-headers.sh /tmp/
@@ -85,8 +92,9 @@ ENV RUST_CONFIGURE_ARGS \
       --enable-full-tools \
       --enable-sanitizers \
       --enable-profiler \
-      --enable-compiler-docs
-ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS
+      --enable-compiler-docs \
+      --set target.x86_64-unknown-linux-gnu.linker=clang
+ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS -v
 
 # This is the only builder which will create source tarballs
 ENV DIST_SRC 1

src/ci/docker/dist-x86_64-linux/build-clang.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+# Copyright 2017 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.
+
+set -ex
+
+source shared.sh
+
+LLVM=6.0.0
+
+mkdir clang
+cd clang
+
+curl https://releases.llvm.org/$LLVM/llvm-$LLVM.src.tar.xz | \
+  xz -d | \
+  tar xf -
+
+cd llvm-$LLVM.src
+
+mkdir -p tools/clang
+
+curl https://releases.llvm.org/$LLVM/cfe-$LLVM.src.tar.xz | \
+  xz -d | \
+  tar xf - -C tools/clang --strip-components=1
+
+mkdir ../clang-build
+cd ../clang-build
+
+# For whatever reason the default set of include paths for clang is different
+# than that of gcc. As a result we need to manually include our sysroot's
+# include path, /rustroot/include, to clang's default include path.
+#
+# Alsow there's this weird oddity with gcc where there's an 'include-fixed'
+# directory that it generates. It turns out [1] that Centos 5's headers are so
+# old that they're incompatible with modern C semantics. While gcc automatically
+# fixes that clang doesn't account for this. Tell clang to manually include the
+# fixed headers so we can successfully compile code later on.
+#
+# [1]: https://sourceware.org/ml/crossgcc/2008-11/msg00028.html
+INC="/rustroot/include"
+INC="$INC:/rustroot/lib/gcc/x86_64-unknown-linux-gnu/4.8.5/include-fixed"
+INC="$INC:/usr/include"
+
+hide_output \
+    cmake ../llvm-$LLVM.src \
+      -DCMAKE_C_COMPILER=/rustroot/bin/gcc \
+      -DCMAKE_CXX_COMPILER=/rustroot/bin/g++ \
+      -DCMAKE_BUILD_TYPE=Release \
+      -DCMAKE_INSTALL_PREFIX=/rustroot \
+      -DLLVM_TARGETS_TO_BUILD=X86 \
+      -DC_INCLUDE_DIRS="$INC"
+
+hide_output make -j10
+hide_output make install
+
+cd ../..
+rm -rf clang

src/ci/docker/dist-x86_64-linux/build-gcc.sh

@@ -42,7 +42,6 @@ hide_output ../gcc-$GCC/configure \
     --enable-languages=c,c++
 hide_output make -j10
 hide_output make install
-ln -nsf gcc /rustroot/bin/cc
 
 cd ..
 rm -rf gcc-build