Move gcc later in the build order.

Building openssl and curl first lets us use TLS for all later
downloads. The curl/openssl included with our Centos:5 base
has compatibility problems with many modern websites.

This slows the cycle time since we update openssl and curl
more often than gcc, which was previously first since it's
one of the slowest packages to build.

slaves/dist/Dockerfile

@@ -27,13 +27,6 @@ RUN mkdir /buildslave && chown rustbuild:rustbuild /buildslave
 RUN mkdir /home/rustbuild
 RUN chown rustbuild:rustbuild /home/rustbuild
 
-# Install gcc 4.7 which has C++11 support which is required by LLVM
-#
-# After we're done building we erase the binutils/gcc installs from CentOS to
-# ensure that we always use the ones that we just built.
-COPY dist/build_gcc.sh /build/
-RUN /bin/bash build_gcc.sh && rm -rf /build
-
 # 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
 # later as well), so build a copy of OpenSSL with dynamic libraries into our
@@ -50,6 +43,13 @@ RUN /bin/bash build_openssl.sh && rm -rf /build
 COPY dist/build_curl.sh /build/
 RUN /bin/bash build_curl.sh
 
+# Install gcc 4.7 which has C++11 support which is required by LLVM
+#
+# After we're done building we erase the binutils/gcc installs from CentOS to
+# ensure that we always use the ones that we just built.
+COPY dist/build_gcc.sh /build/
+RUN /bin/bash build_gcc.sh && rm -rf /build
+
 # binutils < 2.22 has a bug where the 32-bit executables it generates
 # immediately segfault in Rust, so we need to install our own binutils.
 #

slaves/dist/build_gcc.sh

@@ -6,7 +6,7 @@ VERSION=4.7.4
 SHA256=92e61c6dc3a0a449e62d72a38185fda550168a86702dea07125ebd3ec3996282
 
 yum install -y wget
-curl http://ftp.gnu.org/gnu/gcc/gcc-$VERSION/gcc-$VERSION.tar.bz2 | \
+curl https://ftp.gnu.org/gnu/gcc/gcc-$VERSION/gcc-$VERSION.tar.bz2 | \
   tee >(sha256sum > gcc-$VERSION.tar.bz2.sha256) | tar xjf -
 test $SHA256 = $(cut -d ' ' -f 1 gcc-$VERSION.tar.bz2.sha256) || exit 1