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diff --git a/libc/ci/docker/wasm32-wasi/Dockerfile b/libc/ci/docker/wasm32-wasi/Dockerfile
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-# In the first container we want to assemble the `wasi-sysroot` by compiling it
-# from source. This requires a clang 8.0+ compiler with enough wasm support and
-# then we're just running a standard `make` inside of what we clone.
-FROM ubuntu:18.04 as wasi-sysroot
-
-RUN apt-get update && \
- apt-get install -y --no-install-recommends \
- ca-certificates \
- clang \
- cmake \
- curl \
- g++ \
- git \
- libc6-dev \
- libclang-dev \
- make \
- ssh \
- xz-utils
-
-# Fetch clang 8.0+ which is used to compile the wasi target and link our
-# programs together.
-RUN curl http://releases.llvm.org/8.0.0/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04.tar.xz | tar xJf -
-RUN mv /clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04 /wasmcc
-
-# Note that we're using `git reset --hard` to pin to a specific commit for
-# verification for now. The sysroot is currently in somewhat of a state of flux
-# and is expected to have breaking changes, so this is an attempt to mitigate
-# those breaking changes on `libc`'s own CI
-RUN git clone https://github.com/CraneStation/wasi-sysroot && \
- cd wasi-sysroot && \
- git reset --hard eee6ee7566e26f2535eb6088c8494a112ff423b9
-RUN make -C wasi-sysroot install -j $(nproc) WASM_CC=/wasmcc/bin/clang INSTALL_DIR=/wasi-sysroot
-
-# This is a small wrapper script which executes the actual clang binary in
-# `/wasmcc` and then is sure to pass the right `--sysroot` argument which we
-# just built above.
-COPY docker/wasm32-wasi/clang.sh /wasi-sysroot/bin/clang
-
-# In the second container we're going to build the `wasmtime` binary which is
-# used to execute wasi executables. This is a standard Rust project so we're
-# just checking out a known revision (which pairs with the sysroot one we
-# downlaoded above) and then we're building it with Cargo
-FROM ubuntu:18.04 as wasmtime
-
-RUN apt-get update && \
- apt-get install -y --no-install-recommends \
- ca-certificates \
- clang \
- cmake \
- curl \
- g++ \
- git \
- libclang-dev \
- make \
- ssh
-
-RUN curl -sSf https://sh.rustup.rs | sh -s -- -y
-ENV PATH=/root/.cargo/bin:$PATH
-
-RUN apt-get install -y --no-install-recommends python
-RUN git clone --recursive https://github.com/CraneStation/wasmtime wasmtime && \
- cd wasmtime && \
- git reset --hard a2647878977726935c3d04c05cabad9607ec7606
-RUN cargo build --release --manifest-path wasmtime/Cargo.toml
-
-# And finally in the last image we're going to assemble everything together.
-# We'll install things needed at runtime for now and then copy over the
-# sysroot/wasmtime artifacts into their final location.
-FROM ubuntu:18.04
-
-RUN apt-get update && \
- apt-get install -y --no-install-recommends \
- gcc \
- libc6-dev \
- libxml2 \
- ca-certificates
-
-# Copy over clang we downloaded to link executables ...
-COPY --from=wasi-sysroot /wasmcc /wasmcc/
-# ... and the sysroot we built to link executables against ...
-COPY --from=wasi-sysroot /wasi-sysroot/ /wasi-sysroot/
-# ... and finally wasmtime to actually execute binaries
-COPY --from=wasmtime /wasmtime/target/release/wasmtime /usr/bin/
-
-# Of note here is our clang wrapper which just executes a normal clang
-# executable with the right sysroot, and then we're sure to turn off the
-# crt-static feature to ensure that the CRT that we're specifying with `clang`
-# is used.
-ENV CARGO_TARGET_WASM32_WASI_RUNNER=wasmtime \
- CARGO_TARGET_WASM32_WASI_LINKER=/wasi-sysroot/bin/clang \
- CC_wasm32_wasi=/wasi-sysroot/bin/clang \
- PATH=$PATH:/rust/bin \
- RUSTFLAGS=-Ctarget-feature=-crt-static