[v10] Remove Clang from CentOS 7 Docker buildbox

build.assets/Dockerfile-centos7

@@ -53,79 +53,6 @@ RUN git clone --depth=1 https://github.com/Yubico/libfido2.git -b 1.11.0 && \
     echo /usr/local/lib64 > /etc/ld.so.conf.d/libfido2.conf && \
     ldconfig
 
-FROM centos:7 AS centos-devtoolset
-
-# Install required dependencies.
-RUN yum groupinstall -y 'Development Tools' && \
-    yum install -y epel-release && \
-    yum update -y && \
-    yum -y install centos-release-scl-rh && \
-    yum install -y \
-        # required by libbpf, Clang
-        centos-release-scl \
-        # required by Clang/LLVM
-        cmake3 \
-        # required by libbpf and Clang
-        devtoolset-11-gcc* \
-        # required by libbpf
-        devtoolset-11-make \
-        # required by libbpf
-        elfutils-libelf-devel \
-        # required by libbpf
-        elfutils-libelf-devel-static \
-        git \
-        # required by libbpf, Clang
-        scl-utils \
-        # required by libbpf
-        zlib-devel \
-        # required by libbpf
-        zlib-static && \
-    yum clean all
-
-# Use just created devtool image with newer GCC and Cmake
-FROM centos-devtoolset as clang10
-
-# Compile Clang 10.0.1 from source. It is needed to create BPF files.
-# Centos 7 doesn't provide it as a package unfortunately.
-# LLVM_INCLUDE_BENCHMARKS must be off, otherwise compilation fails,
-# CLANG_BUILD_TOOLS must be on, it builds clang binary,
-# LLVM_BUILD_TOOLS must be on, it builds llvm-strip binary.
-# the rest is disabled to speedup the compilation.
-RUN git clone --branch llvmorg-10.0.1 --depth=1 https://github.com/llvm/llvm-project.git && \
-    cd llvm-project/ && \
-    mkdir build && cd build/ && \
-    scl enable devtoolset-11 'bash -c "cmake3 \
-        -DCLANG_BUILD_TOOLS=ON \
-        -DCLANG_ENABLE_ARCMT=OFF \
-        -DCLANG_ENABLE_STATIC_ANALYZER=OFF \
-        -DCMAKE_BUILD_TYPE=Release \
-        -DCMAKE_INSTALL_PREFIX=/opt/llvm \
-        -DLLVM_BUILD_TOOLS=ON \
-        -DLLVM_BUILD_UTILS=OFF \
-        -DLLVM_ENABLE_BINDINGS=OFF \
-        -DLLVM_ENABLE_PROJECTS=clang \
-        -DLLVM_INCLUDE_BENCHMARKS=OFF \
-        -DLLVM_INCLUDE_GO_TESTS=OFF \
-        -DLLVM_INCLUDE_TESTS=OFF \
-        -DLLVM_TOOL_LLI_BUILD=OFF \
-        -G \"Unix Makefiles\" ../llvm && \
-    make -j6 &&  \
-    make install"' && \
-    cd ../.. && \
-    rm -rf llvm-project
-
-# Use just created devtools image with never GCC
-FROM centos-devtoolset as libbpf
-
-# Install libbpf - compile with a newer GCC. The one installed by default is not able to compile it.
-# BUILD_STATIC_ONLY disables libbpf.so build as we don't need it.
-ARG LIBBPF_VERSION
-RUN mkdir -p /opt && cd /opt && \
-    curl -L https://github.com/gravitational/libbpf/archive/refs/tags/v${LIBBPF_VERSION}.tar.gz | tar xz && \
-    cd /opt/libbpf-${LIBBPF_VERSION}/src && \
-    scl enable devtoolset-11 "make && BUILD_STATIC_ONLY=y DESTDIR=/opt/libbpf make install"
-
-
 FROM centos:7 AS buildbox
 
 ENV LANGUAGE=en_US.UTF-8 \
@@ -143,10 +70,6 @@ RUN (groupadd ci --gid=$GID -o && useradd ci --uid=$UID --gid=$GID --create-home
 
 RUN yum groupinstall -y 'Development Tools' && \
     yum install -y \
-        # required by libbpf
-        elfutils-libelf-devel \
-        # required by libbpf
-        elfutils-libelf-devel-static \
         git \
         net-tools \
         # required by Teleport PAM support
@@ -156,10 +79,6 @@ RUN yum groupinstall -y 'Development Tools' && \
         # used by our Makefile
         which \
         zip \
-        # required by libbpf
-        zlib-devel \
-        # required by libbpf
-        zlib-static && \
     yum clean all
 
 # Install etcd.
@@ -243,13 +162,6 @@ RUN cd /usr/local/lib64 && \
 COPY pkgconfig/centos7/ /
 ENV PKG_CONFIG_PATH="/usr/local/lib64/pkgconfig"
 
-# Copy Clang into the final image.
-COPY --from=clang10 /opt/llvm /opt/llvm/
-ENV PATH=/opt/llvm/bin:${PATH}
-
-# Copy libbpf into the final image.
-COPY --from=libbpf /opt/libbpf/usr /usr
-
 USER ci
 VOLUME ["/go/src/github.com/gravitational/teleport"]
 EXPOSE 6600 2379 2380