On Wed, Jul 19, 2017 at 04:12:37PM -0700, Kees Cook wrote: > On Wed, Jul 19, 2017 at 12:37 PM, Josh Poimboeuf <jpoim...@redhat.com> wrote: > > +#define ASM_UNREACHABLE > > \ > > + "999: .pushsection .discard.unreachable\n\t" \ > > + ".long 999b - .\n\t" \ > > + ".popsection\n\t" > > Will this end up running into the same bug fixed with > 3d1e236022cc1426b0834565995ddee2ca231cee and the __LINE__ macro? I > could tell under which conditions gcc would do this kind of merging...
I hope not, but objtool should complain about it if it does. We could involve the __LINE__ macro, or some other way to make the labels unique, but that might complicate the code a bit, so we can delay doing that unless necessary. -- Josh
