This is not a bug in clang. It isn't a case of "the asm constraints we need are not implemented" it is a case of the code not being valid. The error printed by clang is correct. See this post for more details: https://code.google.com/p/nativeclient/issues/detail?id=4201#c5
Or the description of the K constraint here: https://gcc.gnu.org/onlinedocs/gcc/Simple-Constraints.html#Simple-Constraints I think a simple (albeit not quite elegant) fix would be to just use X instead of K. --Jeremy > On Oct 10, 2015, at 13:48, Andrea Canciani <ranm...@gmail.com> wrote: > > It looks like the latest XCode cannot build pixman: > > $ clang --version > Apple LLVM version 7.0.0 (clang-700.0.72) > Target: x86_64-apple-darwin14.5.0 > Thread model: posix > > pixman-mmx.c:100:20: error: constraint 'K' expects an integer constant > expression > : "y" (__A), "K" (__N) > ^~~ > Reported here: > https://github.com/Homebrew/homebrew/issues/41056 > > It looks like the test performed in configure.ac does not match the code with > sufficient accuracy. > In particular, the constant is hardcoded in the configure.ac test, while in > the code it is only available after inlining. > > The attached hack gets the code to compile on modern clang, but I believe > first of all we should improve the configure.ac detection code so that pixman > can actually build both on old and on new clang versions (possibly with mmx > disabled, if the asm constraints we need are not implemented). > > Andrea > <pixman-mmx.c.diff>_______________________________________________ > Pixman mailing list > Pixman@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/pixman
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_______________________________________________ Pixman mailing list Pixman@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/pixman
