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diff --git a/src/ci/docker/host-x86_64/dist-i686-linux/Dockerfile b/src/ci/docker/host-x86_64/dist-i686-linux/Dockerfile
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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++
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+ENV HOSTS=i686-unknown-linux-gnu
+
+ENV RUST_CONFIGURE_ARGS \
+      --enable-full-tools \
+      --enable-sanitizers \
+      --enable-profiler \
+      --set target.i686-unknown-linux-gnu.linker=clang \
+      --build=i686-unknown-linux-gnu \
+      --set llvm.ninja=false \
+      --set rust.jemalloc
+ENV SCRIPT python3 ../x.py dist --build $HOSTS --host $HOSTS --target $HOSTS
+ENV CARGO_TARGET_I686_UNKNOWN_LINUX_GNU_LINKER=clang
+
+# This was added when we switched from gcc to clang. It's not clear why this is
+# needed unfortunately, but without this the stage1 bootstrap segfaults
+# somewhere inside of a build script. The build ends up just hanging instead of
+# actually killing the process that segfaulted, but if the process is run
+# manually in a debugger the segfault is immediately seen as well as the
+# misaligned stack access.
+#
+# Added in #50200 there's some more logs there
+ENV CFLAGS -mstackrealign
+
+# 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
+
+# There was a bad interaction between "old" 32-bit binaries on current 64-bit
+# kernels with selinux enabled, where ASLR mmap would sometimes choose a low
+# address and then block it for being below `vm.mmap_min_addr` -> `EACCES`.
+# This is probably a kernel bug, but setting `ulimit -Hs` works around it.
+# See also `src/ci/run.sh` where this takes effect.
+ENV SET_HARD_RLIMIT_STACK 1
+
+ENV DIST_REQUIRE_ALL_TOOLS 1