Andrew Pinski <pins...@gmail.com> writes: > On Fri, Jul 15, 2016 at 6:46 PM, Patrick Palka <patr...@parcs.ath.cx> wrote: >> The build step that invokes "ranlib libbackend.a" (which immediately >> follows the invocation of "ar rc libbackend.a ...") takes over 7 seconds >> on my machine and causes the entire 450MB archive to be rewritten. By >> instead making the build system use ar rcs -- so that the archive and >> its index are built at once -- the time it takes for the compiler to get >> rebuilt gets reduced by 25%, from 27s to 20s (in a --disable-bootstrap >> tree after touching a random source file). This is a pretty significant >> reduction in compile time and disk io. >> >> Is this a good idea? > > Yes and no. Do we know if all ar support rcs now?
It is easy to find out: run a configure check. Andreas. -- Andreas Schwab, sch...@linux-m68k.org GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different."
