On Wed, 16 Nov 2005, Richard Henderson wrote: > On Wed, Nov 16, 2005 at 10:02:23PM +0100, Peter S. Mazinger wrote: > > On Wed, 16 Nov 2005, Richard Henderson wrote: > > > > > On Wed, Nov 16, 2005 at 08:40:11PM +0100, Peter S. Mazinger wrote: > > > > On Wed, 16 Nov 2005, Richard Henderson wrote: > > > > > > > > > On Tue, Nov 15, 2005 at 09:01:21PM +0100, Peter S. Mazinger wrote: > > > > > > I meant exactly this, gcc supports -fno-stack-protector (although > > > > > > gcc > > > > > > defaults to no-ssp), so -fno-stack-protector-all should be there too > > > > > > > > > > Why? What option would it perform? > > > > > > > > to have the possibility to override an earlier one, as it is done w/ > > > > many > > > > fno* options. Why should this one not have it's counterpart. > > > > > > There are three states we can be in: > > > > > > (0) no stack protection -fno-stack-protector > > > (1) heuristic stack protection -fstack-protector > > > (2) all stack protection -fstack-protector-all > > > > > > All of these three states have corresponding switches. You can > > > use any of them at any time. > > > > True for default configs. Let's consider though other distros like > > ubuntu/adamantix/gentoo that can default to "(2) all stack protection" > > but sometimes, due to problems (mainly c++) -all has to be disabled. > > -fno-stack-protector would disable all the protection, that is not what > > would be needed. > > Use -fstack-protector to return to state (1).
you missed the example earlier, or the behaviour of these 2 flags are not like they were earlier. what happens w/ -fstack-protector-all -fstack-protector (in this order) ? do we have (2) or (1) If the order is relevant then (1) will apply. so now it does -fstack-protector #define __SSP__ 1 ; #undef __SSP_ALL__ -fstack-protector-all #define __SSP_ALL__ 2 ; #undef __SSP__ and the last wins. I think this is not quite correct, because -all is a superset of -fstack-protector, so it also should define __SSP__ 1 Peter -- Peter S. Mazinger <ps dot m at gmx dot net> ID: 0xA5F059F2 Key fingerprint = 92A4 31E1 56BC 3D5A 2D08 BB6E C389 975E A5F0 59F2
