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+# We document platform support for minimum glibc 2.17 and kernel 3.2.
+# CentOS 7 has headers for kernel 3.10, but that's fine as long as we don't
+# actually use newer APIs in rustc or std without a fallback. It's more
+# important that we match glibc for ELF symbol versioning.
+FROM centos:7
+
+WORKDIR /build
+
+RUN yum upgrade -y && \
+    yum install -y epel-release && \
+    yum install -y \
+      automake \
+      bzip2 \
+      file \
+      cmake3 \
+      gcc \
+      gcc-c++ \
+      git \
+      glibc-devel.i686 \
+      glibc-devel.x86_64 \
+      libedit-devel \
+      libstdc++-devel.i686 \
+      libstdc++-devel.x86_64 \
+      make \
+      ncurses-devel \
+      openssl-devel \
+      patch \
+      perl \
+      pkgconfig \
+      python3 \
+      unzip \
+      wget \
+      xz \
+      zlib-devel.i686 \
+      zlib-devel.x86_64
+
+RUN mkdir -p /rustroot/bin && ln -s /usr/bin/cmake3 /rustroot/bin/cmake
+
+ENV PATH=/rustroot/bin:$PATH
+ENV LD_LIBRARY_PATH=/rustroot/lib64:/rustroot/lib32:/rustroot/lib
+ENV PKG_CONFIG_PATH=/rustroot/lib/pkgconfig
+WORKDIR /tmp
+RUN mkdir /home/user
+COPY host-x86_64/dist-x86_64-linux/shared.sh /tmp/
+
+# Need at least GCC 5.1 to compile LLVM nowadays
+COPY host-x86_64/dist-x86_64-linux/build-gcc.sh /tmp/
+RUN ./build-gcc.sh && yum remove -y gcc gcc-c++
+
+# Now build LLVM+Clang, afterwards configuring further compilations to use the
+# clang/clang++ compilers.
+COPY host-x86_64/dist-x86_64-linux/build-clang.sh /tmp/
+RUN ./build-clang.sh
+ENV CC=clang CXX=clang++
+
+# rustc-perf version from 2022-07-22
+ENV PERF_COMMIT 3c253134664fdcba862c539d37f0de18557a9a4c
+RUN curl -LS -o perf.zip https://github.com/rust-lang/rustc-perf/archive/$PERF_COMMIT.zip && \
+    unzip perf.zip && \
+    mv rustc-perf-$PERF_COMMIT rustc-perf && \
+    rm perf.zip
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+ENV PGO_HOST=x86_64-unknown-linux-gnu
+
+ENV HOSTS=x86_64-unknown-linux-gnu
+
+ENV RUST_CONFIGURE_ARGS \
+      --enable-full-tools \
+      --enable-sanitizers \
+      --enable-profiler \
+      --enable-compiler-docs \
+      --set target.x86_64-unknown-linux-gnu.linker=clang \
+      --set target.x86_64-unknown-linux-gnu.ar=/rustroot/bin/llvm-ar \
+      --set target.x86_64-unknown-linux-gnu.ranlib=/rustroot/bin/llvm-ranlib \
+      --set llvm.thin-lto=true \
+      --set llvm.ninja=false \
+      --set rust.jemalloc \
+      --set rust.use-lld=true
+ENV SCRIPT ../src/ci/pgo.sh python3 ../x.py dist \
+    --host $HOSTS --target $HOSTS \
+    --include-default-paths \
+    build-manifest
+ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=clang
+
+# This is the only builder which will create source tarballs
+ENV DIST_SRC 1
+
+# When we build cargo in this container, we don't want it to use the system
+# libcurl, instead it should compile its own.
+ENV LIBCURL_NO_PKG_CONFIG 1
+
+ENV DIST_REQUIRE_ALL_TOOLS 1