GCC BPF support (#327)

Merge libbpf/ci#164

Update kernel-build workflow and configs to run selftests/bpf with BPF
objects compiled with recent GCC BPF.

Signed-off-by: Ihor Solodrai <ihor.solodrai@pm.me>

.github/scripts/matrix.py

@@ -101,6 +101,9 @@ def tests(self) -> Dict[str, Any]:
         # if self.arch in [Arch.X86_64, Arch.AARCH64]:
         #     tests_list.append("sched_ext")
 
+        if self.arch == Arch.X86_64:
+            tests_list.append("test_progs-bpf_gcc")
+
         if not self.parallel_tests:
             tests_list = [test for test in tests_list if not test.endswith("parallel")]
 

.github/workflows/kernel-build.yml

@@ -46,6 +46,10 @@ jobs:
     timeout-minutes: 100
     env:
         ARTIFACTS_ARCHIVE: "vmlinux-${{ inputs.arch }}-${{ inputs.toolchain_full }}.tar.zst"
+
+        BUILD_BPF_GCC: ${{ inputs.arch == 'x86_64' && 'true' || '' }}
+        BPF_GCC_INSTALL_DIR: ${{ github.workspace }}/bpf-gcc
+
         BPF_NEXT_BASE_BRANCH: 'master'
         BPF_NEXT_FETCH_DEPTH: 64 # A bit of history is needed to facilitate incremental builds
         # BUILD_SCHED_EXT_SELFTESTS: ${{ inputs.arch == 'x86_64' || inputs.arch == 'aarch64' && 'true' || '' }}
@@ -106,11 +110,19 @@ jobs:
           kbuild-output: ${{ env.KBUILD_OUTPUT }}
           max-make-jobs: 32
           llvm-version: ${{ inputs.llvm-version }}
+
+      - if: ${{ env.BUILD_BPF_GCC }}
+        name: Build GCC for BPF selftests
+        uses: libbpf/ci/build-bpf-gcc@v3
+        with:
+          install-dir: ${{ env.BPF_GCC_INSTALL_DIR }}
+
       - name: Build selftests/bpf
         uses: libbpf/ci/build-selftests@v3
         env:
           MAX_MAKE_JOBS: 32
           RELEASE: ${{ inputs.release && '1' || '' }}
+          BPF_GCC: ${{ env.BUILD_BPF_GCC && env.BPF_GCC_INSTALL_DIR || '' }}
         with:
           arch: ${{ inputs.arch }}
           kernel-root: ${{ env.KERNEL_ROOT }}