On Fri, Mar 02, 2012 at 03:11:21PM +1100, Bruce Evans wrote: > >If we could add the returns_twice attribute to setjmp() then the > >compiler makes sure all registers are dead before calling it and > >jmp_buf wouldn't have to be that big. > > I think compilers already do stuff like that automatically. They have > to for setjmp() to work. Since there was no way to declare such > attributes 20 years ago, compilers had to know that setjmp() was > special and make it work when it only has a Standard C declaration > (and some magic in its inmplementation).
It is an existing bug in FreeBSD that the *kernel* doesn't have such attribution. Since it is using -ffreestanding, interference is incorrect. LLVM recently moved the attribution logic from the LLVM librarie into the C frontend where it belongs, but this does have the negative side effect that it no longer magically fixes up issues for -ffreestanding. Joerg _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
