On Fri, Jan 29, 2021 at 06:54:08PM +0200, Nikolay Borisov wrote: > > > On 29.01.21 г. 18:49 ч., Josh Poimboeuf wrote: > > Agreed, stable is a good idea. I think Nikolay saw it with GCC 9. > > > Yes I did, with the default Ubuntu compiler as well as the default gcc-10 > compiler: > > # gcc -v -Q -O2 --help=target | grep protection > > gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04) > COLLECT_GCC_OPTIONS='-v' '-Q' '-O2' '--help=target' '-mtune=generic' > '-march=x86-64' > /usr/lib/gcc/x86_64-linux-gnu/9/cc1 -v -imultiarch x86_64-linux-gnu > help-dummy -dumpbase help-dummy -mtune=generic -march=x86-64 -auxbase > help-dummy -O2 -version --help=target -fasynchronous-unwind-tables > -fstack-protector-strong -Wformat -Wformat-security -fstack-clash-protection > -fcf-protection -o /tmp/ccSecttk.s > GNU C17 (Ubuntu 9.3.0-17ubuntu1~20.04) version 9.3.0 (x86_64-linux-gnu) > compiled by GNU C version 9.3.0, GMP version 6.2.0, MPFR version 4.0.2, > MPC version 1.1.0, isl version isl-0.22.1-GMP > > > It has -fcf-protection turned on by default it seems.
Yup, explains why I didn't see it: gcc version 10.2.1 20201125 (Red Hat 10.2.1-9) (GCC) COLLECT_GCC_OPTIONS='-v' '-Q' '-O2' '--help=target' '-mtune=generic' '-march=x86-64' /usr/libexec/gcc/x86_64-redhat-linux/10/cc1 -v help-dummy -dumpbase help-dummy -mtune=generic -march=x86-64 -auxbase help-dummy -O2 -version --help=target -o /tmp/cclBz55H.s -- Josh
