Date: Tue, 22 Jan 2008 10:33:27 +0100 From: Marius Strobl <marius@alchemy.franken.de> To: Andrew Reilly <andrew@areilly.bpc-users.org> Cc: Joseph Koshy <jkoshy@freebsd.org>, freebsd-stable@freebsd.org, freebsd-ports@freebsd.org Subject: Re: 7-STABLE regression that breaks lang/drscheme is src/contrib/gcc/gthr-posix.h 1.1.1.8.2.1 Message-ID: <20080122093327.GB38360@alchemy.franken.de> In-Reply-To: <20080122094405.230a0856@duncan.reilly.home> References: <20080122094405.230a0856@duncan.reilly.home>
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On Tue, Jan 22, 2008 at 09:44:05AM +1100, Andrew Reilly wrote: > Hello again, > > [to recap: drscheme, (which is an IDE that runs under the "mred" > runtime, built from ports/lang/drscheme (or actually manually > from a personal copy of that Makefile that builds the current > release: 372, rather than ver 370 in ports)) worked beautifully > on my system until I updated to 7-STABLE after 4 Jan. I track > -STABLE every week or two. After that, it segfaults before > printing or displaying anything, and running under gdb has found > that it stops in the garbage collector initialization. I > haven't raised a PR for this yet because I still think that the > problem is probably the drscheme FreeBSD configuration that has > bit-rotted a little, now that FreeBSD has changed slightly. > Still investigating... I've cc'd Joseph Koshy, because this > seems to be somehow related to PR ports/118808.] > > I've done the binary search through CVS, and established that > the precise file and revision that is causing me (or rather, > drscheme) grief: src/contrib/gcc/gthr-posix.h 1.1.1.8.2.1 marius > at 5 Jan 22:58.51. Csupping back to 5 Jan 22:50 is enough to > make everyting happy again. > > Unfortunately, I'm at a loss to explain how this change could be > causing an existing binary to run or not, because it changes the > compiler. Well, presumably it changes the installed libc.so and > libstdc++.so, both of which are linked in at run-time (c++ is used > in mred/drscheme for the wxWidgets GUI). Indeed, the most recent > time that I backed this revision of gthr-posix.h out (regressed > to 5 Jan 22:50), drscheme started to work as soon as the system > libraries had been installed, before I had rebooted. The __gthread_active_p(), which returns false positives prior to the current version of gthr-posix.h, isn't only used in libstdc++ but also in headers that are installed beneath /usr/include/c++. So the code in those headers compiled into an existing binary which was built prior to the gthr-posix.h fix still might erroneously determine that it's running in a threaded environment while f.e. libstdc++ does not, causing the problems you see. Did you try a mred built on a stock 7-STABLE? > > Since there hasn't been any other wailing about incompatability > since this change, my guess is that mred was somehow working > around the previous FreeBSD behaviour: it has quite a bit of > low-level platform-specific configuration, since it is a > language runtime. The ideal solution will be to figure out how > to tweak it's FreeBSD compatability to suit the new operation. > If anyone can offer a hint as to which area I should be looking > at for configuration knobs, I'd be really grateful. > Marius
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