<disclaimer>For anyone following along, frontend flags are not guaranteed to be stable (as in, they may be removed in a later version of Swift), nor are they guaranteed to produce correct or working code. Jiho’s use is exactly the correct one—to check for a difference of behavior in the Swift compiler itself—but please do not use these in production code.</disclaimer>
Jordan > On Jan 13, 2017, at 13:50, Slava Pestov via swift-dev <swift-dev@swift.org> > wrote: > > Hi Jiho, > > Some low-level frontend flags are not exposed to the driver. > > To pass frontend flags directly via the driver, use -Xfrontend, eg > > swiftc -Xfrontend -assume-single-threaded mytest.swift > > This is different from -frontend — -frontend skips the driver entirely, > -Xfrontend runs the driver but passes the next argument to each frontend > invocation. > > Slava > >> On Jan 13, 2017, at 1:01 PM, Jiho Choi via swift-dev <swift-dev@swift.org> >> wrote: >> >> Hi, >> >> I want to try -assume-single-threaded option to measure the overhead of >> atomic operations for reference counting. However, it seems that the option >> works as intended with the frontend but not with the driver. In other >> words, I tried two commands below, and only the first command replaced >> atomic operations. >> >> swiftc -frontend -emit-sil -assume-single-threaded mytest.swift >> swiftc -emit-sil -assume-single-threaded mytest.swift >> >> Is the option disabled for the driver for some reason? >> >> Thanks, >> Jiho >> _______________________________________________ >> swift-dev mailing list >> swift-dev@swift.org >> https://lists.swift.org/mailman/listinfo/swift-dev > > _______________________________________________ > swift-dev mailing list > swift-dev@swift.org > https://lists.swift.org/mailman/listinfo/swift-dev _______________________________________________ swift-dev mailing list swift-dev@swift.org https://lists.swift.org/mailman/listinfo/swift-dev
