You need an additional flag for the stdlib. —debug-swift-stdlib Sent from my iPhone
> On Aug 6, 2017, at 1:50 PM, David Zarzycki <zarzy...@icloud.com> wrote: > > >> On Aug 6, 2017, at 16:16, Michael Gottesman <mgottes...@apple.com> wrote: >> >> >>> On Aug 6, 2017, at 11:11 AM, David Zarzycki via swift-dev >>> <swift-dev@swift.org> wrote: >>> >>> Hello, >>> >>> Unless I’m missing a build-script flag, it seems to me that compiling the >>> Swift stdlib with the unoptimized debug swift compiler takes about 15 >>> minutes on a fast machine. >> >> I am assuming that you mean a debug swift compiler building an optimized >> stdlib? > > Hi Michael, > > I’m building the debug swift compiler via ./utils/build-script -r > —debug-swift. I assume, perhaps wrongly, that implies a debug stdlib. > >> >>> Other than forcing the type checker to be optimized, what if any tricks can >>> I use to building the stdlib faster with the debug compiler? Is there a way >>> to tell Clang to enable the inliner and only the inliner during -O0 builds? >>> I have an anecdotal experiment[1] that suggests that this would yield >>> appreciably faster Swift stdlib builds with the debug compiler (and >>> selfishly speaking, I can tolerate the minor impact on debugging that >>> inlining does to otherwise unoptimized code). >> >> Are building LLVM in release + Swift in debug? I.e.: >> >> —release-debuginfo --debug-swift --force-optimized-typechecker > > Yes, with the exception that I cannot use —force-optimized-typechecker > because I’m hacking on the type checker. Otherwise, this is what I’m doing to > make debug builds go as fast as possible: > > ./utils/build-script \ > --llvm-targets-to-build X86 \ > --skip-ios --skip-tvos --skip-watchos \ > --skip-build-benchmarks true \ > --build-swift-static-stdlib false \ > --build-swift-static-sdk-overlay false \ > --build-swift-dynamic-sdk-overlay false \ > --build-swift-stdlib-unittest-extra false \ > --extra-cmake-options \\-DCMAKE_CXX_FLAGS=-Werror=switch \ > -r \ > --debug-swift \ > "$@" > > >> >>> >>> Thanks! >>> >>> Dave >>> >>> [1] – If one force inlines LLVM’s casting logic and associated callbacks >>> (like classof() and getKind()), then the Swift stdlib builds 18% faster on >>> my machine with the debug Swift compiler. One can imagine how much faster >>> the whole stdlib would compile if all trivial functions were inlined >>> automatically. >>> _______________________________________________ >>> 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
