On Wed, Mar 05, 2008 at 09:38:13PM +0100, Michael Matz wrote: > Hi, > > On Wed, 5 Mar 2008, Aurelien Jarno wrote: > > > > So I think gcc at least needs an *option* to revert to the old behavior, > > > and there's a good argument to make it the default for now, at least for > > > x86/x86-64 on Linux. > > > > And for other kernels. I tested OpenBSD 4.1, FreeBSD 6.3, NetBSD 4.0, > > they have the same behaviour as Linux, that is they don't clear DF > > before calling the signal handler. > > Sigh. We could perhaps insert a cld for all functions which can be > recognized as possible signal handlers and call other unknown or string > functions. But it's probably even faster to emit cld in front of the > inline copies of mem functions again :-(
Yes, if there are four kernels that get it "wrong", that effectively means that the ABI document doesn't describe reality and gcc has to adjust.
