ubuntu_bpf failed to build on F-ibm-5.15

[Po-Hsu Lin]

Test build failed with:
  In file included from progs/test_ksyms_btf_null_check.c:4:
  /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/tools/include/vmlinux.h:5:15: error: attribute 'preserve_access_index' is not supported by '#pragma clang attribute'
  #pragma clang attribute push (__attribute__((preserve_access_index)), apply_to = record)
                ^
  /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/tools/include/vmlinux.h:132008:15: error: '#pragma clang attribute pop' with no matching '#pragma clang attribute push'
  #pragma clang attribute pop
                ^
  2 errors generated.

We are using clang-9 for this, we might need to use clang-10 instead.

[Po-Hsu Lin (cypressyew)]

With clang-10 and llvm-10, test build failed with:
  Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'
  Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'
  Warning: Kernel ABI header at 'tools/include/uapi/linux/if_link.h' differs from latest version at 'include/uapi/linux/if_link.h'
  fatal error: error in backend: line 27: Invalid usage of the XADD return value
  Stack dump:
  0. Program arguments: clang-10 -g -D__TARGET_ARCH_x86 -mlittle-endian -I/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/tools/include -I/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf -I/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/include/uapi -I/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/usr/include -idirafter /usr/local/include -idirafter /usr/lib/llvm-10/lib/clang/10.0.0/include -idirafter /usr/include/x86_64-linux-gnu -idirafter /usr/include -Wno-compare-distinct-pointer-types -DENABLE_ATOMICS_TESTS -O2 -target bpf -c progs/atomics.c -o /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/atomics.o -mcpu=v3
  1. <eof> parser at end of file
  2. Code generation
  3. Running pass 'Function Pass Manager' on module 'progs/atomics.c'.
  4. Running pass 'BPF PreEmit Checking' on function '@add'
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZN4llvm3sys15PrintStackTraceERNS_11raw_ostreamE+0x1f)[0x7fa525c8a4ff]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZN4llvm3sys17RunSignalHandlersEv+0x50)[0x7fa525c887b0]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZN4llvm3sys15CleanupOnSignalEm+0xdd)[0x7fa525c89c4d]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(+0x8d6cea)[0x7fa525bdfcea]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(+0x8d6c8b)[0x7fa525bdfc8b]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(+0x97c3fe)[0x7fa525c853fe]
  clang-10[0x4125b2]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZN4llvm18report_fatal_errorERKNS_5TwineEb+0x104)[0x7fa525be99b4]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZN4llvm18report_fatal_errorENS_9StringRefEb+0x0)[0x7fa525be9a80]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(+0x21874ed)[0x7fa5274904ed]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZN4llvm19MachineFunctionPass13runOnFunctionERNS_8FunctionE+0x118)[0x7fa525f255e8]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZN4llvm13FPPassManager13runOnFunctionERNS_8FunctionE+0x466)[0x7fa525d8fd76]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZN4llvm13FPPassManager11runOnModuleERNS_6ModuleE+0x33)[0x7fa525d8fff3]
  /lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZN4llvm6legacy15PassManagerImpl3runERNS_6ModuleE+0x3c0)[0x7fa525d904a0]
  /lib/x86_64-linux-gnu/libclang-cpp.so.10(_ZN5clang17EmitBackendOutputERNS_17DiagnosticsEngineERKNS_19HeaderSearchOptionsERKNS_14CodeGenOptionsERKNS_13TargetOptionsERKNS_11LangOptionsERKN4llvm10DataLayoutEPNSE_6ModuleENS_13BackendActionESt10unique_ptrINSE_17raw_pwrite_streamESt14default_deleteISM_EE+0x3173)[0x7fa52ad85433]
  /lib/x86_64-linux-gnu/libclang-cpp.so.10(+0x1667e1c)[0x7fa52b004e1c]
  /lib/x86_64-linux-gnu/libclang-cpp.so.10(_ZN5clan...

[Po-Hsu Lin (cypressyew)]

Test show it will need clang-13 and llvm-13 from proposed pocket. As we're not using -proposed for SRU, this might be debatable if we should enable it.