On Fri, 26 May 2023 at 15:48, Stefan Kanthak <stefan.kant...@nexgo.de> wrote: > > "Jakub Jelinek" <ja...@redhat.com> wrote: > > [...] > > > And for -m32 it is also the last option that wins, but as with > > many other cases just last one from certain set of options. [...] > > The -mISA options are processed left to right after > > as well as BEFORE
No. You seem to be interpreting "after" to mean "later in the command line" but Jakub means *at a later time*. He used "left to right" to describe position in the command line, and "after" means "at a later time". Any -march options are processed first, from left to right. After that, there is a base arch in effect. Then, after that, the -mISA options are processed, and take effect relative to the base arch. What Jakub wrote is correct. If you try a bit harder to understand what has been said repeatedly, you might get it. > > > setting base from -march=. > > In other words: although -march= selects a (documented sub)set of > -mISA options, it does NEITHER reset any -mISA option set NOR any > -mno-ISA option reset BEFORE or AFTER itself, i.e. all -m[no-]ISA > options have precedence even if they preceed -march=. > > Just document that! That is not far from unreadable.
