add BPF GCC support for BPF CI

build-selftests/action.yml

@@ -7,6 +7,9 @@ inputs:
   toolchain:
     description: 'what toolchain to use'
     default: 'gcc'
+  bpf-toolchain:
+    description: 'what bpf toolchain to use'
+    default: 'clang'
   kbuild-output:
     description: 'relative or absolute path to use for storing build artifacts'
     required: true
@@ -29,6 +32,6 @@ runs:
       run: |
         kbuild_output="$(realpath ${{ inputs.kbuild-output }})"
         export LLVM_VERSION=${{ inputs.llvm-version }}
-        ${GITHUB_ACTION_PATH}/build_selftests.sh "${{ inputs.arch }}" "${{ inputs.kernel }}" "${{ inputs.toolchain }}" "${kbuild_output}"
+        ${GITHUB_ACTION_PATH}/build_selftests.sh "${{ inputs.arch }}" "${{ inputs.kernel }}" "${{ inputs.toolchain }}" "${kbuild_output}" "${{ inputs.bpf-toolchain }}"
       env:
         MAX_MAKE_JOBS: ${{ inputs.max-make-jobs }}

build-selftests/build_selftests.sh

@@ -10,9 +10,11 @@ TARGET_ARCH="$1"
 KERNEL="$2"
 TOOLCHAIN="$3"
 export KBUILD_OUTPUT="$4"
+BPF_TOOLCHAIN="$5"
 
 ARCH="$(platform_to_kernel_arch ${TARGET_ARCH})"
 CROSS_COMPILE=""
+BPF_GCC_BIN="$(pwd)/install_bpf_gcc/bin/bpf-unknown-none-gcc"
 
 if [[ "${TARGET_ARCH}" != "$(uname -m)" ]]
 then
@@ -51,6 +53,12 @@ MAKE_OPTS=$(cat <<EOF
 	VMLINUX_H=${VMLINUX_H}
 EOF
 )
+
+if [[ "${BPF_TOOLCHAIN}" == 'gcc' ]]
+then
+	MAKE_OPTS="${MAKE_OPTS} BPF_GCC=${BPF_GCC_BIN}"
+fi
+
 SELF_OPTS=$(cat <<EOF
 	-C ${REPO_ROOT}/${REPO_PATH}/tools/testing/selftests/bpf
 EOF

setup-build-env/action.yml

@@ -16,6 +16,9 @@ inputs:
   arch:
     description: 'arch'
     required: true
+  bpf-toolchain:
+    description: 'bpf-toolchain to build'
+    required: true
 runs:
   using: "composite"
   steps:
@@ -24,13 +27,19 @@ runs:
       run: |
         echo "::group::Setup"
         sudo apt-get update
-        sudo apt-get install -y cmake flex bison build-essential libssl-dev ncurses-dev xz-utils bc rsync libguestfs-tools qemu-kvm qemu-utils linux-image-generic zstd binutils-dev elfutils libcap-dev libelf-dev libdw-dev python3-docutils
+        sudo apt-get install -y cmake flex bison build-essential libssl-dev ncurses-dev xz-utils bc rsync libguestfs-tools qemu-kvm qemu-utils linux-image-generic zstd binutils-dev elfutils libcap-dev libelf-dev libdw-dev python3-docutils texinfo
         echo "::endgroup::"
     - name: Install clang
       shell: bash
       run: |
         export LLVM_VERSION=${{ inputs.llvm-version }}
         ${GITHUB_ACTION_PATH}/install_clang.sh
+    - name: Install bpf-gcc
+      if: inputs.bpf-toolchain == 'gcc'
+      shell: bash
+      run: |
+        export BPF_TOOLCHAIN=${{ inputs.bpf-toolchain }}
+        ${GITHUB_ACTION_PATH}/install_bpf_gcc.sh
     - name: Install pahole
       shell: bash
       run: |

setup-build-env/install_bpf_gcc.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+set -eu
+
+source $(cd $(dirname $0) && pwd)/../helpers.sh
+
+LOGFILE=build-gnu-bpf.log
+INSTALLDIR=$(pwd)/install_bpf_gcc/
+
+mkdir -p build_bpf_gcc
+cd build_bpf_gcc
+
+foldable start install_bpf_gcc "Installing BPF GCC"
+BINUTILS_TARBALL=`wget https://snapshots.sourceware.org/binutils/trunk/latest/src/sha512.sum -O - -o /dev/null | grep -E 'binutils-[0-9a-f.-]+.tar.xz' | sed -e 's/.*\(binutils-[^<]*\).*/\1/'`
+GCC_TARBALL=`wget https://gcc.gnu.org/pub/gcc/snapshots/LATEST-15 -O - -o /dev/null | grep -E 'gcc-15-[0-9]+.tar.xz' | sed -e 's/.*\(gcc-15-[^<]*\).*/\1/'`
+
+BINUTILS_URL="https://snapshots.sourceware.org/binutils/trunk/latest/src/$BINUTILS_TARBALL"
+GCC_URL="https://gcc.gnu.org/pub/gcc/snapshots/LATEST-15/$GCC_TARBALL"
+
+BINUTILS_BASENAME=$(basename $BINUTILS_TARBALL .tar.xz)
+GCC_BASENAME=$(basename $GCC_TARBALL .tar.xz)
+
+test -f $BINUTILS_TARBALL || {
+  echo -n "Fetching $BINUTILS_URL... ";
+  wget -o /dev/null $BINUTILS_URL || { echo -e "\nerror: could not fetch $BINUTILS_URL"; exit 1; };
+  echo done;
+}
+
+test -f $GCC_TARBALL || {
+  echo -n "Fetching $GCC_URL... ";
+  wget -o /dev/null $GCC_URL || { echo -e "\nerror: could not fetch $GCC_URL"; exit 1; };
+  echo done;
+}
+
+if [ ! -f  "${INSTALLDIR}/${BINUTILS_BASENAME}.built" ]; then
+  echo -n "Building and installing $BINUTILS_TARBALL... ";
+  (tar xJf $BINUTILS_TARBALL;
+  cd ${BINUTILS_BASENAME};
+   mkdir build-bpf;
+   cd build-bpf && ../configure --target=bpf-unknown-none --prefix=$INSTALLDIR && make -j $(nproc) && make install && touch ${INSTALLDIR}/${BINUTILS_BASENAME}.built;
+   ) >> $LOGFILE 2>&1 || { echo -e "\nerror: building $BINUTILS_TARBALL"; exit 1; }
+  echo done
+fi
+
+if [ ! -f  "${INSTALLDIR}/${GCC_BASENAME}.built" ]; then
+  echo -n "Building and installing $GCC_TARBALL... ";
+  (tar xJf $GCC_TARBALL;
+   cd ${GCC_BASENAME};
+   ./contrib/download_prerequisites
+   mkdir build-bpf;
+   cd build-bpf && ../configure --target=bpf-unknown-none --prefix=$INSTALLDIR && make -j $(nproc) && make install && touch ${INSTALLDIR}/${GCC_BASENAME}.built;
+   ) >> $LOGFILE 2>&1 || { echo -e "\nerror: building $GCC_TARBALL"; exit 1; }
+  echo done
+fi
+foldable end install_bpf_gcc