• LPC2020NotesLLVMGNU

Notes on LLVM/GCC BoF Attendees: 75

• User poll: most use GCC or both GCC+LLVM
• Developer poll: most none or GCC
• Other tools poll: GNU toolchain mostly
• Other tools developer: ditto

Cooperation LLVM-GNU:

• Aspects: language standards, abi, interop, comms
• Popular: abi, interop
• interop how?
  • shared testsuite, toward gas compatibility (a "language standard" variant)
  • gnu binutils testsuite can be run against some llvm tools
  • glibc uses inline asm in clang-unfriendly way, has other gcc specifics too
  • clang/gcc incompatibilities are a bug that are actively worked on
• abi compat how?
  • c++ abi spec ambiguity has hit compatibility unnecessarily, generally filed, some unfixed, incl. widening 8- or 16-bit parameters, backward compatibility philosophy makes it hard to fix
• comm channels?
  • getting a kernel-specific toolchain-oriented mailing list started
  • as opposed to c-abi list?

  • https://lore.kernel.org/linux-api/

  • https://sourceware.org/mailman/listinfo/gnu-gabi

• in search of leaders for these initiatives