Re: [PATCH net-next v3 1/7] overflow: add DEFINE_FLEX() for on-stack allocs

On 8/16/23 18:35, kernel test robot wrote:

Hi Przemek,

kernel test robot noticed the following build errors:

[auto build test ERROR on 479b322ee6feaff612285a0e7f22c022e8cd84eb]

url:    https://github.com/intel-lab-lkp/linux/commits/Przemek-Kitszel/overflow-add-DEFINE_FLEX-for-on-stack-allocs/20230816-221402
base:   479b322ee6feaff612285a0e7f22c022e8cd84eb
patch link:    https://lore.kernel.org/r/20230816140623.452869-2-przemyslaw.kitszel%40intel.com
patch subject: [PATCH net-next v3 1/7] overflow: add DEFINE_FLEX() for on-stack allocs
config: x86_64-rhel-8.3-rust (https://download.01.org/0day-ci/archive/20230817/202308170000.YqabIR9D-lkp@intel.com/config)

Rust folks, could you please tell me if this is something I should fix, or I just uncovered some existing bug in "unstable" thing?

Perhaps it is worth to mention, diff of v3 vs v2 is:
move dummy implementation of __has_builtin() macro to the top of compiler_types.h, just before `#ifndef ASSEMBLY`

Przemek

compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce: (https://download.01.org/0day-ci/archive/20230817/202308170000.YqabIR9D-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot [off-list ref]
| Closes: https://lore.kernel.org/oe-kbuild-all/202308170000.YqabIR9D-lkp@intel.com/ (local)

All errors (new ones prefixed by >>):

quoted

quoted

thread 'main' panicked at '"ftrace_branch_data_union_(anonymous_at_include/linux/compiler_types_h_144_2)" is not a valid Ident', /opt/cross/rustc-1.68.2-bindgen-0.56.0/cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.24/src/fallback.rs:693:9

    stack backtrace:
       0: rust_begin_unwind
                 at /rustc/9eb3afe9ebe9c7d2b84b71002d44f4a0edac95e0/library/std/src/panicking.rs:575:5
       1: core::panicking::panic_fmt
                 at /rustc/9eb3afe9ebe9c7d2b84b71002d44f4a0edac95e0/library/core/src/panicking.rs:64:14
       2: proc_macro2::fallback::Ident::_new
       3: proc_macro2::Ident::new
       4: bindgen::ir::context::BindgenContext::rust_ident
       5: <bindgen::ir::comp::CompInfo as bindgen::codegen::CodeGenerator>::codegen
       6: <bindgen::ir::ty::Type as bindgen::codegen::CodeGenerator>::codegen
       7: <bindgen::ir::item::Item as bindgen::codegen::CodeGenerator>::codegen
       8: <bindgen::ir::comp::CompInfo as bindgen::codegen::CodeGenerator>::codegen
       9: <bindgen::ir::ty::Type as bindgen::codegen::CodeGenerator>::codegen
      10: <bindgen::ir::item::Item as bindgen::codegen::CodeGenerator>::codegen
      11: <bindgen::ir::module::Module as bindgen::codegen::CodeGenerator>::codegen
      12: <bindgen::ir::item::Item as bindgen::codegen::CodeGenerator>::codegen
      13: bindgen::ir::context::BindgenContext::gen
      14: bindgen::Builder::generate
      15: bindgen::main
    note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
    make[3]: *** [rust/Makefile:316: rust/uapi/uapi_generated.rs] Error 1
    make[3]: *** Deleting file 'rust/uapi/uapi_generated.rs'

quoted

quoted

thread 'main' panicked at '"ftrace_branch_data_union_(anonymous_at_include/linux/compiler_types_h_144_2)" is not a valid Ident', /opt/cross/rustc-1.68.2-bindgen-0.56.0/cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.24/src/fallback.rs:693:9

    stack backtrace:
       0: rust_begin_unwind
                 at /rustc/9eb3afe9ebe9c7d2b84b71002d44f4a0edac95e0/library/std/src/panicking.rs:575:5
       1: core::panicking::panic_fmt
                 at /rustc/9eb3afe9ebe9c7d2b84b71002d44f4a0edac95e0/library/core/src/panicking.rs:64:14
       2: proc_macro2::fallback::Ident::_new
       3: proc_macro2::Ident::new
       4: bindgen::ir::context::BindgenContext::rust_ident
       5: <bindgen::ir::comp::CompInfo as bindgen::codegen::CodeGenerator>::codegen
       6: <bindgen::ir::ty::Type as bindgen::codegen::CodeGenerator>::codegen
       7: <bindgen::ir::item::Item as bindgen::codegen::CodeGenerator>::codegen
       8: <bindgen::ir::comp::CompInfo as bindgen::codegen::CodeGenerator>::codegen
       9: <bindgen::ir::ty::Type as bindgen::codegen::CodeGenerator>::codegen
      10: <bindgen::ir::item::Item as bindgen::codegen::CodeGenerator>::codegen
      11: <bindgen::ir::module::Module as bindgen::codegen::CodeGenerator>::codegen
      12: <bindgen::ir::item::Item as bindgen::codegen::CodeGenerator>::codegen
      13: bindgen::ir::context::BindgenContext::gen
      14: bindgen::Builder::generate
      15: bindgen::main
    note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
    make[3]: *** [rust/Makefile:310: rust/bindings/bindings_generated.rs] Error 1
    make[3]: *** Deleting file 'rust/bindings/bindings_generated.rs'
    make[3]: Target 'rust/' not remade because of errors.
    make[2]: *** [Makefile:1293: prepare] Error 2
    make[1]: *** [Makefile:234: __sub-make] Error 2
    make[1]: Target 'prepare' not remade because of errors.
    make: *** [Makefile:234: __sub-make] Error 2
    make: Target 'prepare' not remade because of errors.