On Sat, Jan 25, 2025 at 11:09 PM Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > > On Fri, 24 Jan 2025 at 16:22, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > > > > Linus, please merge the MM updates for the 6.14 development cycle, > > This does not build at all for me. > > I get > > ./arch/x86/include/asm/current.h:49:9: error: call to undeclared > function '__typeof_unqual__'; ISO C99 and later do not support > implicit function declarations [-Wimplicit-function-declaration] > > when running the Rust 'bindgen', and what seems to be going on is that > my version of *gcc* does support __typeof_unqual__, so I end up with > > CONFIG_CC_HAS_TYPEOF_UNQUAL=y > > in my kernel config, but I think that 'bindgen' that generates the > Rust bindings is based on LLVM, and clearly does not understand __typeof_unqual__ is available in Clang 19.1.0 in all C modes as an extension [1] and as reported in [2], bindgen 0,70.1 seems to parse __typeof_unqual__ okay. [1] https://releases.llvm.org/19.1.0/tools/clang/docs/ReleaseNotes.html [2] https://lore.kernel.org/lkml/9fa81826-8fa6-47e4-a0a2-4916e5d042a7@stanley.mountain/ Maybe configure could detect bindgen version and disable CC_HAS_TYPEOF_UNQUAL [3] if it is too old? [3] https://lore.kernel.org/lkml/20241208204708.3742696-3-ubizjak@xxxxxxxxx/ Uros.
