On Tue, 9 Jul, 2019, 11:16 PM Denis Kirjanov, wrote: > > > On Tuesday, July 9, 2019, Muni Sekhar wrote: > >> On Tue, Jul 9, 2019 at 10:56 PM Denis Kirjanov >> wrote: >> > >> > >> > >> > On Tuesday, July 9, 2019, Muni Sekhar wrote: >> >> >> >> Hi All, >> >> >> >> >> >> My Kernel is built with the following options: >> >> >> >> >> >> >> >> CONFIG_CC_STACKPROTECTOR=y >> >> >> >> CONFIG_CC_STACKPROTECTOR_STRONG=y >> >> >> >> >> >> >> >> >> >> >> >> We use out-of-tree kernel modules in our project and I need to measure >> the performance of it by using a bit older gcc version 4.8.5. >> >> >> >> >> >> >> >> I can build the modules with gcc above 5 version, but when I try to >> use gcc version 4.8.5 I’m getting the following error: >> >> >> >> >> >> >> >> Makefile:693: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: >> -fstack-protector-strong not supported by compiler >> >> >> >> >> >> >> >> So it looks like gcc 4.8.5 does not support >> CONFIG_CC_STACKPROTECTOR_STRONG option, but how to instruct gcc to ignore >> this one? >> >> >> >> >> >> >> >> In runtime, is it possible to instruct kernel to ignore >> “CONFIG_CC_STACKPROTECTOR_STRONG=y” (without building the kernel) by using >> sysctl or any other method? >> >> >> >> >> > >> > >> > Just disable it in your .config file >> >> I disabled in /lib/modules/$(uname -r)/build/.config, but still get >> that error. Does kernel needs to be recompiled? >> >> CONFIG_CC_STACKPROTECTOR=y >> # CONFIG_CC_STACKPROTECTOR_NONE is not set >> # CONFIG_CC_STACKPROTECTOR_REGULAR is not set >> # CONFIG_CC_STACKPROTECTOR_STRONG is not set >> >> > You have to disable it in your kernel source directory > and then run ‘make oldconfig’ > I got this error while building out of tree module in Ubuntu system. I'm directly using the Ubuntu distribution kernel , so where should I suppose to run the 'make old config'? Because I didn't have the kernel source code. > > >> > >> >> >> >> Any help is appreciated. >> >> >> >> >> >> >> >> -- >> >> Thanks, >> >> Sekhar >> > >> > >> > >> > -- >> > Regards / Mit besten Grüßen, >> > Denis >> > >> >> >> -- >> Thanks, >> Sekhar >> > > > -- > Regards / Mit besten Grüßen, > Denis > >