From: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> > On Thu, May 9, 2019 at 4:11 PM Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote: > > BTW, is this a speedup when doing CC/LD FLAGS etc checks unconditionally? > > Yes. > cc-option is somewhat costly because it invoked the compiler to > check if the given flag is supported. > > So, I want to get rid of as many cc-option calls as possible. > > > > Asking in general - do you have any numbers :-)? > > Removing a couple of cc-options does not make > a measurable difference in general use-cases. > > But, this might be more beneficial for chrome OS > because $(CC) is a wrapper and invoking it is much more expensive. Android does too, which we plan on removing as we recently measured the performance cost of 5% for having a Python wrapper to aid in bisection. Anyways, I checked these options with clang 4 and gcc 4.6.4 in godbolt. Tested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> -- Thanks, ~Nick Desaulniers
