Update libc crate to 0.2.66

This change updates the libc crate to version 0.2.66.

Import subrepo libc/:libc at 4f11029a68040c90acf771976b019c1ef273a8cd

17 files changed, 170 insertions, 59 deletions

diff --git a/libc/ci/azure-install-rust.yml b/libc/ci/azure-install-rust.yml
index eba0669..31b0714 100644
--- a/libc/ci/azure-install-rust.yml
+++ b/libc/ci/azure-install-rust.yml
@@ -6,10 +6,12 @@ steps:
         toolchain=nightly
       fi
       if command -v rustup; then
-        rustup update $toolchain
+        # Uncomment when rustup on Azure is updated
+        #rustup set profile minimal
+        rustup update --force $toolchain
         rustup default $toolchain
       else
-        curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain $toolchain
+        curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain $toolchain --profile=minimal
         echo "##vso[task.prependpath]$HOME/.cargo/bin"
       fi
     displayName: Install rust (unix)
@@ -17,7 +19,9 @@ steps:
   - script: |
       @echo on
       if not defined TOOLCHAIN set TOOLCHAIN=nightly
-      rustup update %TOOLCHAIN%-%TARGET%
+      :: Uncomment when rustup on Azure is updated
+      ::rustup set profile minimal
+      rustup update --no-self-update %TOOLCHAIN%-%TARGET%
       rustup default %TOOLCHAIN%-%TARGET%
     displayName: Install rust (windows)
     condition: eq( variables['Agent.OS'], 'Windows_NT' )
diff --git a/libc/ci/azure-master.yml b/libc/ci/azure-master.yml
new file mode 100644
index 0000000..d7bcb7c
--- /dev/null
+++ b/libc/ci/azure-master.yml
@@ -0,0 +1,22 @@
+variables:
+  - group: secrets
+resources:
+  repositories:
+    - repository: rustinfra
+      type: github
+      name: rust-lang/simpleinfra
+      endpoint: gnzlbg
+trigger: ["master"]
+pr: ["master"]
+
+jobs:
+  - job: StyleAndDocs
+    pool:
+      vmImage: ubuntu-16.04
+    steps:
+      - template: azure-install-rust.yml
+      - script: LIBC_CI=1 sh ci/dox.sh
+        displayName: Generate documentation
+      - template: azure-configs/static-websites.yml@rustinfra
+        parameters:
+          deploy_dir: target/doc
diff --git a/libc/ci/azure.yml b/libc/ci/azure.yml
index 4526361..da25a26 100644
--- a/libc/ci/azure.yml
+++ b/libc/ci/azure.yml
@@ -25,7 +25,7 @@ jobs:
           TARGET: x86_64-unknown-linux-gnu
 
   - job: DockerLinuxTier2
-    dependsOn: DockerLinuxTier1
+    #dependsOn: DockerLinuxTier1
     pool:
       vmImage: ubuntu-16.04
     steps:
@@ -46,8 +46,10 @@ jobs:
           TARGET: arm-unknown-linux-gnueabihf
         arm-unknown-linux-musleabihf:
           TARGET: arm-unknown-linux-musleabihf
-        asmjs-unknown-emscripten:
-          TARGET: asmjs-unknown-emscripten
+        # Disabled because currently broken, see:
+        # https://github.com/rust-lang/libc/issues/1591         
+        # asmjs-unknown-emscripten:
+        #  TARGET: asmjs-unknown-emscripten
         i686-linux-android:
           TARGET: i686-linux-android
         i686-unknown-linux-musl:
@@ -74,8 +76,10 @@ jobs:
         #  TARGET: wasm32-wasi
         sparc64-unknown-linux-gnu:
           TARGET: sparc64-unknown-linux-gnu
-        wasm32-unknown-emscripten:
-          TARGET: wasm32-unknown-emscripten
+        # Disabled because currently broken, see:
+        # https://github.com/rust-lang/libc/issues/1591         
+        # wasm32-unknown-emscripten:
+        #  TARGET: wasm32-unknown-emscripten
         x86_64-linux-android:
           TARGET: x86_64-linux-android
         x86_64-unknown-linux-gnux32:
@@ -122,10 +126,12 @@ jobs:
           ARCH: x86_64
         x86_64-pc-windows-msvc:
           TARGET: x86_64-pc-windows-msvc
-        i686-pc-windows-gnu:
-          TARGET: i686-pc-windows-gnu
-          ARCH_BITS: 32
-          ARCH: i686
+        # Disabled because broken:          
+        #  https://github.com/rust-lang/libc/issues/1592
+        #i686-pc-windows-gnu:
+        #  TARGET: i686-pc-windows-gnu
+        #  ARCH_BITS: 32
+        #  ARCH: i686
         i686-pc-windows-msvc:
           TARGET: i686-pc-windows-msvc
 
@@ -136,7 +142,7 @@ jobs:
       - template: azure-install-rust.yml
       - script: sh ci/style.sh
         displayName: Check style
-      - script: sh ci/dox.sh
+      - script: LIBC_CI=1 sh ci/dox.sh
         displayName: Generate documentation
       - template: azure-configs/static-websites.yml@rustinfra
         parameters:
@@ -169,7 +175,7 @@ jobs:
       vmImage: ubuntu-16.04
     steps:
       - template: azure-install-rust.yml
-      - script: sh ./ci/build.sh
+      - script: LIBC_CI=1 sh ./ci/build.sh
         displayName: Execute build.sh
     strategy:
       matrix:
@@ -198,7 +204,7 @@ jobs:
       vmImage: macos-10.13
     steps:
       - template: azure-install-rust.yml
-      - script: sh ./ci/build.sh
+      - script: LIBC_CI=1 sh ./ci/build.sh
         displayName: Execute build.sh
     strategy:
       matrix:
diff --git a/libc/ci/build.sh b/libc/ci/build.sh
index e63b4f7..082f0dc 100644
--- a/libc/ci/build.sh
+++ b/libc/ci/build.sh
@@ -2,6 +2,8 @@
 
 # Checks that libc builds properly for all supported targets on a particular
 # Rust version:
+# The FILTER environment variable can be used to select which target(s) to build.
+# For example: set FILTER to vxworks to select the targets that has vxworks in name
 
 set -ex
 
@@ -13,7 +15,7 @@ RUST=${TOOLCHAIN}
 echo "Testing Rust ${RUST} on ${OS}"
 
 if [ "${TOOLCHAIN}" = "nightly" ] ; then
-    cargo +nightly install cargo-xbuild -Z install-upgrade
+    cargo +nightly install cargo-xbuild
     rustup component add rust-src
 fi
 
@@ -65,6 +67,13 @@ test_target() {
     cargo "+${RUST}" "${BUILD_CMD}" -vv $opt --no-default-features --target "${TARGET}" \
           --features extra_traits
 
+    # Test the 'const-extern-fn' feature on nightly
+    if [ "${RUST}" = "nightly" ]; then
+        cargo "+${RUST}" "${BUILD_CMD}" -vv $opt --no-default-features --target "${TARGET}" \
+          --features const-extern-fn
+    fi
+
+
     # Also test that it builds with `extra_traits` and default features:
     if [ "$NO_STD" != "1" ]; then
         cargo "+${RUST}" "${BUILD_CMD}" -vv $opt --target "${TARGET}" \
@@ -90,7 +99,6 @@ mips-unknown-linux-musl \
 mips64-unknown-linux-gnuabi64 \
 mips64el-unknown-linux-gnuabi64 \
 mipsel-unknown-linux-gnu \
-mipsel-unknown-linux-gnu \
 mipsel-unknown-linux-musl \
 powerpc-unknown-linux-gnu \
 powerpc64-unknown-linux-gnu \
@@ -176,7 +184,9 @@ case "${OS}" in
 esac
 
 for TARGET in $TARGETS; do
-    test_target build "$TARGET"
+    if echo "$TARGET"|grep -q "$FILTER";then
+        test_target build "$TARGET"
+    fi
 done
 
 # FIXME: https://github.com/rust-lang/rust/issues/58564
@@ -204,10 +214,13 @@ i686-unknown-netbsd \
 i686-unknown-openbsd \
 mips-unknown-linux-uclibc \
 mipsel-unknown-linux-uclibc \
+mips64-unknown-linux-muslabi64 \
+mips64el-unknown-linux-muslabi64 \
 nvptx64-nvidia-cuda \
 powerpc-unknown-linux-gnuspe \
 powerpc-unknown-netbsd \
 powerpc64-unknown-freebsd \
+riscv64gc-unknown-linux-gnu \
 riscv32imac-unknown-none-elf \
 riscv32imc-unknown-none-elf \
 sparc64-unknown-netbsd \
@@ -224,7 +237,7 @@ x86_64-unknown-haiku \
 x86_64-unknown-hermit \
 x86_64-unknown-l4re-uclibc \
 x86_64-unknown-openbsd \
-armv7-wrs-vxworks \
+armv7-wrs-vxworks-eabihf \
 aarch64-wrs-vxworks \
 i686-wrs-vxworks \
 x86_64-wrs-vxworks \
@@ -235,7 +248,9 @@ powerpc64-wrs-vxworks \
 
 if [ "${RUST}" = "nightly" ] && [ "${OS}" = "linux" ]; then
     for TARGET in $RUST_LINUX_NO_CORE_TARGETS; do
-        test_target xbuild "$TARGET" 1
+        if echo "$TARGET"|grep -q "$FILTER";then
+            test_target xbuild "$TARGET" 1
+        fi
     done
 
     # Nintendo switch
diff --git a/libc/ci/docker/asmjs-unknown-emscripten/Dockerfile b/libc/ci/docker/asmjs-unknown-emscripten/Dockerfile
index 6c08340..64f73aa 100644
--- a/libc/ci/docker/asmjs-unknown-emscripten/Dockerfile
+++ b/libc/ci/docker/asmjs-unknown-emscripten/Dockerfile
@@ -7,6 +7,7 @@ RUN apt-get update && \
     gcc \
     git \
     libc6-dev \
+    libxml2 \
     python \
     xz-utils
 
diff --git a/libc/ci/docker/mips-unknown-linux-musl/Dockerfile b/libc/ci/docker/mips-unknown-linux-musl/Dockerfile
index aee73be..a1ec7ff 100644
--- a/libc/ci/docker/mips-unknown-linux-musl/Dockerfile
+++ b/libc/ci/docker/mips-unknown-linux-musl/Dockerfile
@@ -2,16 +2,23 @@ FROM ubuntu:19.04
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         gcc libc6-dev qemu-user ca-certificates qemu-system-mips curl \
-        bzip2
+        xz-utils patch
 
 RUN mkdir /toolchain
 
-# Note that this originally came from:
-# https://downloads.openwrt.org/snapshots/trunk/ar71xx/generic/OpenWrt-SDK-ar71xx-generic_gcc-5.3.0_musl-1.1.15.Linux-x86_64.tar.bz2
-RUN curl --retry 5 -L https://s3-us-west-1.amazonaws.com/rust-lang-ci2/libc/OpenWrt-SDK-ar71xx-generic_gcc-5.3.0_musl-1.1.15.Linux-x86_64.tar.bz2 | \
-    tar xjf - -C /toolchain --strip-components=1
+# Linux kernel version: 4.14.151
+# See build_dir/target-mips_24kc_musl/linux-ar71xx_generic/linux-4.14.151
+# Musl version: 1.1.24
+# See staging_dir/toolchain-mips_24kc_gcc-7.4.0_musl/info.mk
+RUN curl --retry 5 -L https://downloads.openwrt.org/releases/19.07.0-rc1/targets/ar71xx/generic/openwrt-sdk-19.07.0-rc1-ar71xx-generic_gcc-7.4.0_musl.Linux-x86_64.tar.xz | \
+    tar xJf - -C /toolchain --strip-components=1
 
-ENV PATH=$PATH:/rust/bin:/toolchain/staging_dir/toolchain-mips_34kc_gcc-5.3.0_musl-1.1.15/bin \
-    CC_mips_unknown_linux_musl=mips-openwrt-linux-gcc \
-    CARGO_TARGET_MIPS_UNKNOWN_LINUX_MUSL_LINKER=mips-openwrt-linux-gcc \
-    CARGO_TARGET_MIPS_UNKNOWN_LINUX_MUSL_RUNNER="qemu-mips -L /toolchain/staging_dir/toolchain-mips_34kc_gcc-5.3.0_musl-1.1.15"
+# See https://lkml.org/lkml/2014/3/14/269
+COPY sysinfo_guard.patch /toolchain
+RUN patch /toolchain/staging_dir/toolchain-mips_24kc_gcc-7.4.0_musl/include/linux/kernel.h </toolchain/sysinfo_guard.patch
+
+ENV PATH=$PATH:/rust/bin:/toolchain/staging_dir/toolchain-mips_24kc_gcc-7.4.0_musl/bin \
+    STAGING_DIR=/toolchain/staging_dir \
+    CC_mips_unknown_linux_musl=mips-openwrt-linux-musl-gcc \
+    CARGO_TARGET_MIPS_UNKNOWN_LINUX_MUSL_LINKER=mips-openwrt-linux-musl-gcc \
+    CARGO_TARGET_MIPS_UNKNOWN_LINUX_MUSL_RUNNER="qemu-mips -L /toolchain/staging_dir/toolchain-mips_24kc_gcc-7.4.0_musl"
diff --git a/libc/ci/docker/mips64-unknown-linux-muslabi64/Dockerfile b/libc/ci/docker/mips64-unknown-linux-muslabi64/Dockerfile
new file mode 100644
index 0000000..8f63ade
--- /dev/null
+++ b/libc/ci/docker/mips64-unknown-linux-muslabi64/Dockerfile
@@ -0,0 +1,15 @@
+FROM ubuntu:19.04
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  gcc make libc6-dev git curl ca-certificates \
+  gcc-mips64-linux-gnuabi64 qemu-user
+
+COPY install-musl.sh /
+RUN sh /install-musl.sh mips64
+
+# FIXME: shouldn't need the `-lgcc` here, shouldn't that be in libstd?
+ENV PATH=$PATH:/musl-mips64/bin:/rust/bin \
+    CC_mips64_unknown_linux_muslabi64=musl-gcc \
+    RUSTFLAGS='-Clink-args=-lgcc' \
+    CARGO_TARGET_MIPS64_UNKNOWN_LINUX_MUSLABI64_LINKER=musl-gcc \
+    CARGO_TARGET_MIPS64_UNKNOWN_LINUX_MUSLABI64_RUNNER="qemu-mips64 -L /musl-mips64"
diff --git a/libc/ci/docker/mips64el-unknown-linux-muslabi64/Dockerfile b/libc/ci/docker/mips64el-unknown-linux-muslabi64/Dockerfile
new file mode 100644
index 0000000..c42c2ba
--- /dev/null
+++ b/libc/ci/docker/mips64el-unknown-linux-muslabi64/Dockerfile
@@ -0,0 +1,15 @@
+FROM ubuntu:19.04
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  gcc make libc6-dev git curl ca-certificates \
+  gcc-mips64el-linux-gnuabi64 qemu-user
+
+COPY install-musl.sh /
+RUN sh /install-musl.sh mips64el
+
+# FIXME: shouldn't need the `-lgcc` here, shouldn't that be in libstd?
+ENV PATH=$PATH:/musl-mips64el/bin:/rust/bin \
+    CC_mips64el_unknown_linux_muslabi64=musl-gcc \
+    RUSTFLAGS='-Clink-args=-lgcc' \
+    CARGO_TARGET_MIPS64EL_UNKNOWN_LINUX_MUSLABI64_LINKER=musl-gcc \
+    CARGO_TARGET_MIPS64EL_UNKNOWN_LINUX_MUSLABI64_RUNNER="qemu-mips64el -L /musl-mips64el"
diff --git a/libc/ci/docker/mipsel-unknown-linux-musl/Dockerfile b/libc/ci/docker/mipsel-unknown-linux-musl/Dockerfile
index 03e8357..87399ec 100644
--- a/libc/ci/docker/mipsel-unknown-linux-musl/Dockerfile
+++ b/libc/ci/docker/mipsel-unknown-linux-musl/Dockerfile
@@ -1,17 +1,24 @@
 FROM ubuntu:19.04
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
-        gcc libc6-dev qemu-user ca-certificates qemu-system-mips curl \
-        bzip2
+        gcc libc6-dev qemu-user ca-certificates qemu-system-mipsel curl \
+        xz-utils patch
 
 RUN mkdir /toolchain
 
-# Note that this originally came from:
-# https://downloads.openwrt.org/snapshots/trunk/malta/generic/OpenWrt-Toolchain-malta-le_gcc-5.3.0_musl-1.1.15.Linux-x86_64.tar.bz2
-RUN curl --retry 5 -L https://s3-us-west-1.amazonaws.com/rust-lang-ci2/libc/OpenWrt-Toolchain-malta-le_gcc-5.3.0_musl-1.1.15.Linux-x86_64.tar.bz2 | \
-      tar xjf - -C /toolchain --strip-components=2
+# Linux kernel version: 4.14.151
+# See build_dir/target-mipsel_mips32_musl/linux-brcm47xx_generic/linux-4.14.151
+# Musl version: 1.1.24
+# See staging_dir/toolchain-mipsel_mips32_gcc-7.4.0_musl/info.mk
+RUN curl --retry 5 -L https://downloads.openwrt.org/releases/19.07.0-rc1/targets/brcm47xx/generic/openwrt-sdk-19.07.0-rc1-brcm47xx-generic_gcc-7.4.0_musl.Linux-x86_64.tar.xz | \
+    tar xJf - -C /toolchain --strip-components=1
 
-ENV PATH=$PATH:/rust/bin:/toolchain/bin \
-    CC_mipsel_unknown_linux_musl=mipsel-openwrt-linux-gcc \
-    CARGO_TARGET_MIPSEL_UNKNOWN_LINUX_MUSL_LINKER=mipsel-openwrt-linux-gcc \
-    CARGO_TARGET_MIPSEL_UNKNOWN_LINUX_MUSL_RUNNER="qemu-mipsel -L /toolchain"
+# See https://lkml.org/lkml/2014/3/14/269
+COPY sysinfo_guard.patch /toolchain
+RUN patch /toolchain/staging_dir/toolchain-mipsel_mips32_gcc-7.4.0_musl/include/linux/kernel.h </toolchain/sysinfo_guard.patch
+
+ENV PATH=$PATH:/rust/bin:/toolchain/staging_dir/toolchain-mipsel_mips32_gcc-7.4.0_musl/bin \
+    STAGING_DIR=/toolchain/staging_dir \
+    CC_mipsel_unknown_linux_musl=mipsel-openwrt-linux-musl-gcc \
+    CARGO_TARGET_MIPSEL_UNKNOWN_LINUX_MUSL_LINKER=mipsel-openwrt-linux-musl-gcc \
+    CARGO_TARGET_MIPSEL_UNKNOWN_LINUX_MUSL_RUNNER="qemu-mipsel -L /toolchain/staging_dir/toolchain-mipsel_mips32_gcc-7.4.0_musl"
diff --git a/libc/ci/docker/wasm32-unknown-emscripten/Dockerfile b/libc/ci/docker/wasm32-unknown-emscripten/Dockerfile
index c0ce825..4de9e74 100644
--- a/libc/ci/docker/wasm32-unknown-emscripten/Dockerfile
+++ b/libc/ci/docker/wasm32-unknown-emscripten/Dockerfile
@@ -10,6 +10,7 @@ RUN apt-get update && \
     gcc \
     git \
     libc6-dev \
+    libxml2 \
     python \
     cmake \
     sudo \
diff --git a/libc/ci/dox.sh b/libc/ci/dox.sh
index febe18b..271b54b 100644
--- a/libc/ci/dox.sh
+++ b/libc/ci/dox.sh
@@ -19,13 +19,13 @@ if ! rustc --version | grep -E "nightly" ; then
 fi
 
 rustup component add rust-src
-cargo +nightly install cargo-xbuild -Z install-upgrade
+cargo +nightly install cargo-xbuild
 
 # List all targets that do currently build successfully:
 # shellcheck disable=SC1003
 grep '[\d|\w|-]* \\' ci/build.sh > targets
 sed -i.bak 's/ \\//g' targets
-grep '^[_a-zA-Z0-9-]*$' targets > tmp && mv tmp targets
+grep '^[_a-zA-Z0-9-]*$' targets | sort > tmp && mv tmp targets
 
 # Create a markdown list of supported platforms in $PLATFORM_SUPPORT
 rm $PLATFORM_SUPPORT || true
diff --git a/libc/ci/emscripten.sh b/libc/ci/emscripten.sh
index db31323..acec4ca 100644
--- a/libc/ci/emscripten.sh
+++ b/libc/ci/emscripten.sh
@@ -28,21 +28,18 @@ exit 1
   set -x
 }
 
-cd /
-curl --retry 5 -L https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-portable.tar.gz | \
-    tar -xz
-
+git clone https://github.com/emscripten-core/emsdk.git /emsdk-portable
 cd /emsdk-portable
-./emsdk update
-hide_output ./emsdk install sdk-1.38.15-64bit
-./emsdk activate sdk-1.38.15-64bit
+# TODO: switch to an upstream install once
+# https://github.com/rust-lang/rust/pull/63649 lands
+hide_output ./emsdk install 1.38.42
+./emsdk activate 1.38.42
 
 # Compile and cache libc
 # shellcheck disable=SC1091
 source ./emsdk_env.sh
 echo "main(){}" > a.c
 HOME=/emsdk-portable/ emcc a.c
-HOME=/emsdk-portable/ emcc -s BINARYEN=1 a.c
 rm -f a.*
 
 # Make emsdk usable by any user
@@ -53,4 +50,3 @@ chmod a+rxw -R /emsdk-portable
 cd /
 curl --retry 5 -L https://nodejs.org/dist/v12.3.1/node-v12.3.1-linux-x64.tar.xz | \
     tar -xJ
-
diff --git a/libc/ci/install-musl.sh b/libc/ci/install-musl.sh
index ab98c4f..88cb4f0 100644
--- a/libc/ci/install-musl.sh
+++ b/libc/ci/install-musl.sh
@@ -5,7 +5,7 @@
 
 set -ex
 
-MUSL_VERSION=1.1.22
+MUSL_VERSION=1.1.24
 MUSL="musl-${MUSL_VERSION}"
 
 # Download, configure, build, and install musl:
@@ -46,6 +46,20 @@ case ${1} in
         ./configure --prefix="/musl-${musl_arch}"
         make install -j4
         ;;
+    mips64)
+        musl_arch=mips64
+        kernel_arch=mips
+        CC=mips64-linux-gnuabi64-gcc CFLAGS="-march=mips64r2 -mabi=64" \
+          ./configure --prefix="/musl-${musl_arch}" --enable-wrapper=yes
+        make install -j4
+        ;;
+    mips64el)
+        musl_arch=mips64el
+        kernel_arch=mips
+        CC=mips64el-linux-gnuabi64-gcc CFLAGS="-march=mips64r2 -mabi=64" \
+          ./configure --prefix="/musl-${musl_arch}" --enable-wrapper=yes
+        make install -j4
+        ;;
     *)
         echo "Unknown target arch: \"${1}\""
         exit 1
diff --git a/libc/ci/run.sh b/libc/ci/run.sh
index 6f2ca11..b435122 100755
--- a/libc/ci/run.sh
+++ b/libc/ci/run.sh
@@ -5,6 +5,8 @@
 
 set -ex
 
+MIRRORS_URL="https://ci-mirrors.rust-lang.org/libc"
+
 TARGET="${1}"
 
 # If we're going to run tests inside of a qemu image, then we don't need any of
@@ -21,21 +23,21 @@ if [ "$QEMU" != "" ]; then
     # image is .gz : download and uncompress it
     qemufile="$(echo "${QEMU%.gz}" | sed 's/\//__/g')"
     if [ ! -f "${tmpdir}/${qemufile}" ]; then
-      curl --retry 5 "https://s3-us-west-1.amazonaws.com/rust-lang-ci2/libc/${QEMU}" | \
+      curl --retry 5 "${MIRRORS_URL}/${QEMU}" | \
           gunzip -d > "${tmpdir}/${qemufile}"
     fi
   elif [ -z "${QEMU#*.xz}" ]; then
     # image is .xz : download and uncompress it
     qemufile="$(echo "${QEMU%.xz}" | sed 's/\//__/g')"
     if [ ! -f "${tmpdir}/${qemufile}" ]; then
-      curl --retry 5 "https://s3-us-west-1.amazonaws.com/rust-lang-ci2/libc/${QEMU}" | \
+      curl --retry 5 "${MIRRORS_URL}/${QEMU}" | \
           unxz > "${tmpdir}/${qemufile}"
     fi
   else
     # plain qcow2 image: just download it
     qemufile="$(echo "${QEMU}" | sed 's/\//__/g')"
     if [ ! -f "${tmpdir}/${qemufile}" ]; then
-      curl --retry 5 "https://s3-us-west-1.amazonaws.com/rust-lang-ci2/libc/${QEMU}" \
+      curl --retry 5 "${MIRRORS_URL}/${QEMU}" | \
         > "${tmpdir}/${qemufile}"
     fi
   fi
diff --git a/libc/ci/semver.sh b/libc/ci/semver.sh
index 3412501..7e6ea66 100644
--- a/libc/ci/semver.sh
+++ b/libc/ci/semver.sh
@@ -13,7 +13,7 @@ if ! rustc --version | grep -E "nightly" ; then
     exit 1
 fi
 
-cargo +nightly install semverver -Z install-upgrade
+cargo +nightly install semverver
 
 TARGETS=
 case "${OS}" in
diff --git a/libc/ci/style.rs b/libc/ci/style.rs
index 70fc0a0..dcb3536 100644
--- a/libc/ci/style.rs
+++ b/libc/ci/style.rs
@@ -17,7 +17,6 @@
 //! * No trailing whitespace
 //! * No tabs
 //! * 80-character lines
-//! * `extern` instead of `extern "C"`
 //! * Specific module layout:
 //!     1. use directives
 //!     2. typedefs
@@ -126,9 +125,6 @@ fn check_style(file: &str, path: &Path, err: &mut Errors) {
         if line.len() > 80 {
             err.error(path, i, "line longer than 80 chars");
         }
-        if line.contains("extern \"C\"") {
-            err.error(path, i, "use `extern` instead of `extern \"C\"");
-        }
         if line.contains("#[cfg(") && !line.contains(" if ")
             && !(line.contains("target_endian") ||
                  line.contains("target_arch"))
diff --git a/libc/ci/sysinfo_guard.patch b/libc/ci/sysinfo_guard.patch
new file mode 100644
index 0000000..69fb795
--- /dev/null
+++ b/libc/ci/sysinfo_guard.patch
@@ -0,0 +1,10 @@
+@@ -2,7 +2,9 @@
+ #ifndef _LINUX_KERNEL_H
+ #define _LINUX_KERNEL_H
+ 
++#ifdef __GLIBC__
+ #include <linux/sysinfo.h>
++#endif
+ 
+ /*
+  * 'kernel.h' contains some often-used function prototypes etc