On Sat, Mar 22, 2008 at 10:02:22PM +0100, Matthias Klose wrote: > amd64 and i386 side note: the gcc-4.3 4.3.0-2 upload has a patch > reenabling the cld instruction when stringops are used; this patch is > neither in the gcc-4_3-branch or in the trunk. I discussed with doko a bit and have to propose another solution. This solution have a prequisite: gcc must not generate string ops without function calls. To understand this solution you have to understand async signal safety of functions. A signal handler must not call any unsafe function. On a Debian system this list is in signal(7). All the functions are in the libc and the libaio. The following proposal uses this and should fix any program which does not use unsafe functions in their signal handlers: - Add the cld patch to gcc-4.3, the option is disabled by default. - Build glibc (and maybe libaio) with -mcld. Alternative: - Patch an explicit cld to the beginning of each of the safe functions in glibc and libaio. Bastian -- The idea of male and female are universal constants. -- Kirk, "Metamorphosis", stardate 3219.8
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