On Fri, Apr 20, 2018 at 7:38 AM, Arnd Bergmann <arnd@xxxxxxxx> wrote: > On Fri, Apr 20, 2018 at 3:53 PM, Jeffrey Walton <noloader@xxxxxxxxx> wrote: >>> +#if !defined(__x86_64__) || !defined(__ilp32__) >>> #include <asm-generic/msgbuf.h> >>> +#else >> >> I understand there's some progress having Clang compile the kernel. >> Clang treats __ILP32__ and friends differently than GCC. I believe >> ILP32 shows up just about everywhere there are 32-bit ints, longs and >> pointers. You might find it on Aarch64 or you might find it on MIPS64 >> when using Clang. >> >> I think that means this may be a little suspicious: >> >> > +#if !defined(__x86_64__) || !defined(__ilp32__) >> >> I kind of felt LLVM was wandering away from the x32 ABI, but the LLVM >> devs insisted they were within their purview. Also see >> https://lists.llvm.org/pipermail/cfe-dev/2015-December/046300.html. >> >> Sorry about the top-post. I just wanted to pick out that one piece. > > It seems I made a typo and it needs to be __ILP32__ rather than > __ilp32__ (corrected that locally, will resend once we have resolved > this). > > Aside from that, the #if check seems to be correct to me: this > is an x86-specific header, so it won't ever be seen on other > architectures. On x86-32, __x86_64__ isn't set, so we don't care > about whether __ilp32__ is set or not, and on x86-64 (lp64), > __ilp32__ is never set, so we still get the asm-generic header. > Glibc has correct header files for system calls. I have a very old program to check if Linux kernel header files are correct for user space: https://github.com/hjl-tools/linux-header It needs update to check uapi. -- H.J.