On Tue, Oct 28, 2014 at 03:54:05PM +0000, Christian Weisgerber wrote: > On 2014-10-28, Stuart Henderson <st...@openbsd.org> wrote: > > > m4: /usr/obj/ports/bison-3.0.2/bison-3.0.2/data/location.cc at line 332: > > regular expression error in ^(.)[ ]*(::)?([^][:]|:[^:])*: invalid > > character class. > > That's a regex problem. Our regex(3) doesn't like [^][:]. That's > meant to be a single character class: match any char but ']', '[', > or ':'. The issue is that the sequence [: is special and starts a > standard character class name, e.g. [:alpha:]. > > I don't know if that particular RE or our regex engine should be > considered at fault, but reordering the characters from [^][:] to > [^]:[] fixes this particular instance.
gnu-m4 basically uses the old emacs-regexp engines. And since that code is an extension of basic m4, we can't properly say "hey, that's non standard" since that's non standard anyway. One improvement I did was adding THIS error message, which wasn't really present. Which should enable one to track down AND patch the (hopefully few) issues... there might be remaining problems, I haven't had time to look closer. As far as regexp goes, there's some twiddle function that does fudge the regexp to conform MORE to gnu emacs regexp engine... It does not go much farther than handle the ( / \( conundrum... Apart from having a full equivalent to gnu emacs regexp in our m4, the less crazy way to fix things is to patch those issues locally. I want to chime in again that, yes, I know this blocks the bison update. I don't think there's anything impossible in tracking down the few compatibility issues with our m4 and fixing them... it's slightly annoying but definitely do-able. I spent (literally) years getting our m4 to the point where it's a *good* m4 (because the old FSF saw was that, basically all other m4s were shit with weird limitations---which was true--- but is no longer the case... we got autoconf to work, we got bison to work... only the recent update broke things, but I'm sure we're 99% of the way there... just need someone with a bit of time on their hands to look at it.
