Increase the minimum linux-gnu versions

This is implementing the MCP from rust-lang/compiler-team#493. It is
increasing the minimum requirements of a couple Tier 1 targets, and
others at lower tiers, so this should go through FCP sign-offs for both
`T-compiler` and `T-release`.

The new `linux-gnu` baseline is kernel 3.2 and glibc 2.17. We will also
take that kernel as the minimum floor for _all_ `*-linux-*` targets, so
it may be broadly assumed in the implementation of the standard library.
That does not preclude specific targets from having greater requirements
where it makes sense, like a new arch needing something newer, or a
platform like `linux-android` choosing a newer baseline.

README.md

@@ -233,7 +233,7 @@ Snapshot binaries are currently built and tested on several platforms:
 | Platform / Architecture                     | x86 | x86_64 |
 |---------------------------------------------|-----|--------|
 | Windows (7, 8, 10, ...)                     | ✓   | ✓      |
-| Linux (kernel 2.6.32, glibc 2.11 or later)  | ✓   | ✓      |
+| Linux (kernel 3.2, glibc 2.17 or later)     | ✓   | ✓      |
 | macOS (10.7 Lion or later)                  | (\*) | ✓      |
 
 (\*): Apple dropped support for running 32-bit binaries starting from macOS 10.15 and iOS 11.

src/ci/docker/README.md

@@ -219,44 +219,49 @@ For targets: `armv7-unknown-linux-gnueabihf`
 For targets: `aarch64-unknown-linux-gnu`
 
 - Path and misc options > Prefix directory = /x-tools/${CT\_TARGET}
+- Path and misc options > Use a mirror = ENABLE
+- Path and misc options > Base URL = https://ci-mirrors.rust-lang.org/rustc
 - Target options > Target Architecture = arm
 - Target options > Bitness = 64-bit
 - Operating System > Target OS = linux
-- Operating System > Linux kernel version = 4.2.6
+- Operating System > Linux kernel version = 4.1.49
+- Binary utilities > Version of binutils = 2.32
 - C-library > glibc version = 2.17 -- aarch64 support was introduced in this version
-- C compiler > gcc version = 5.2.0
+- C compiler > gcc version = 8.3.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
 ### `powerpc-linux-gnu.config`
 
 For targets: `powerpc-unknown-linux-gnu`
 
 - Path and misc options > Prefix directory = /x-tools/${CT\_TARGET}
-- Path and misc options > Patches origin = Bundled, then local
-- Path and misc options > Local patch directory = /tmp/patches
+- Path and misc options > Use a mirror = ENABLE
+- Path and misc options > Base URL = https://ci-mirrors.rust-lang.org/rustc
 - Target options > Target Architecture = powerpc
 - Target options > Emit assembly for CPU = powerpc -- pure 32-bit PowerPC
 - Operating System > Target OS = linux
-- Operating System > Linux kernel version = 2.6.32.68 -- ~RHEL6 kernel
-- C-library > glibc version = 2.11.1 -- ~SLE11-SP4 glibc
-- C compiler > gcc version = 5.2.0
+- Operating System > Linux kernel version = 3.2.101
+- Binary utilities > Version of binutils = 2.32
+- C-library > glibc version = 2.17 -- ~RHEL7 glibc
+- C compiler > gcc version = 8.3.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
 ### `powerpc64-linux-gnu.config`
 
 For targets: `powerpc64-unknown-linux-gnu`
 
 - Path and misc options > Prefix directory = /x-tools/${CT\_TARGET}
-- Path and misc options > Patches origin = Bundled, then local
-- Path and misc options > Local patch directory = /tmp/patches
+- Path and misc options > Use a mirror = ENABLE
+- Path and misc options > Base URL = https://ci-mirrors.rust-lang.org/rustc
 - Target options > Target Architecture = powerpc
 - Target options > Bitness = 64-bit
 - Target options > Emit assembly for CPU = power4 -- (+)
 - Target options > Tune for CPU = power6 -- (+)
 - Operating System > Target OS = linux
-- Operating System > Linux kernel version = 2.6.32.68 -- ~RHEL6 kernel
-- C-library > glibc version = 2.11.1 -- ~SLE11-SP4 glibc
-- C compiler > gcc version = 5.2.0
+- Operating System > Linux kernel version = 3.2.101
+- Binary utilities > Version of binutils = 2.32
+- C-library > glibc version = 2.17 -- ~RHEL7 glibc
+- C compiler > gcc version = 8.3.0
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
 (+) These CPU options match the configuration of the toolchains in RHEL6.
@@ -266,13 +271,14 @@ For targets: `powerpc64-unknown-linux-gnu`
 For targets: `s390x-unknown-linux-gnu`
 
 - Path and misc options > Prefix directory = /x-tools/${CT\_TARGET}
-- Path and misc options > Patches origin = Bundled, then local
-- Path and misc options > Local patch directory = /tmp/patches
+- Path and misc options > Use a mirror = ENABLE
+- Path and misc options > Base URL = https://ci-mirrors.rust-lang.org/rustc
 - Target options > Target Architecture = s390
 - Target options > Bitness = 64-bit
 - Operating System > Target OS = linux
-- Operating System > Linux kernel version = 2.6.32.71 -- ~RHEL6 kernel
-- C-library > glibc version = 2.12.1 -- ~RHEL6 glibc
+- Operating System > Linux kernel version = 3.2.101
+- Binary utilities > Version of binutils = 2.32
+- C-library > glibc version = 2.17 -- ~RHEL7 glibc
 - C compiler > gcc version = 8.3.0
 - C compiler > gcc extra config = --with-arch=z10 -- LLVM's minimum support
 - C compiler > C++ = ENABLE -- to cross compile LLVM

src/ci/docker/host-x86_64/dist-aarch64-linux/Dockerfile

@@ -1,28 +1,10 @@
 FROM ubuntu:20.04
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
-        curl \
-        ca-certificates
-WORKDIR /tmp
-RUN curl -f https://curl.se/ca/cacert.pem -o cacert.pem
-
-FROM ubuntu:16.04
-
-# The ca-certificates in ubuntu-16 is too old, so update the certificates
-# with something more recent.
-COPY --from=0 /tmp/cacert.pem /tmp/cacert.pem
-ENV CURL_CA_BUNDLE /tmp/cacert.pem
 
 COPY scripts/cross-apt-packages.sh /scripts/
 RUN sh /scripts/cross-apt-packages.sh
 
-# Ubuntu 16.04 (this container) ships with make 4, but something in the
-# toolchains we build below chokes on that, so go back to make 3
-COPY scripts/make3.sh /scripts/
-RUN sh /scripts/make3.sh
-
-COPY scripts/crosstool-ng.sh /scripts/
-RUN sh /scripts/crosstool-ng.sh
+COPY scripts/crosstool-ng-1.24.sh /scripts/
+RUN sh /scripts/crosstool-ng-1.24.sh
 
 COPY scripts/rustbuild-setup.sh /scripts/
 RUN sh /scripts/rustbuild-setup.sh
@@ -37,14 +19,11 @@ USER root
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
-COPY scripts/cmake.sh /scripts/
-RUN /scripts/cmake.sh
-
-ENV PATH=$PATH:/x-tools/aarch64-unknown-linux-gnueabi/bin
+ENV PATH=$PATH:/x-tools/aarch64-unknown-linux-gnu/bin
 
-ENV CC_aarch64_unknown_linux_gnu=aarch64-unknown-linux-gnueabi-gcc \
-    AR_aarch64_unknown_linux_gnu=aarch64-unknown-linux-gnueabi-ar \
-    CXX_aarch64_unknown_linux_gnu=aarch64-unknown-linux-gnueabi-g++
+ENV CC_aarch64_unknown_linux_gnu=aarch64-unknown-linux-gnu-gcc \
+    AR_aarch64_unknown_linux_gnu=aarch64-unknown-linux-gnu-ar \
+    CXX_aarch64_unknown_linux_gnu=aarch64-unknown-linux-gnu-g++
 
 ENV HOSTS=aarch64-unknown-linux-gnu