[swift-dev] build-script -x freezing?

[Jordan Rose]

Hypotheses:
- There are several executables that get linked around the same time (swiftc, swift-ide-test, sil-opt, etc), which leads to swapping.
- Building the standard library with a debug compiler is really slow.
- There’s actually a bug here somewhere, possibly due to a newer version of CMake, or possibly due to xcodebuild, or even maybe the OS making bad scheduling decisions.

For the record, I build with Xcode fairly regularly, but my normal workflow is to generate the Xcode projects, build LLVM, and work in Xcode…but then do a release+asserts build with ninja. I’ll save the Xcode-side build for when I actually want a debug compiler or debug stdlib.

Jordan


> On May 20, 2016, at 14:36, Austin Zheng via swift-dev <swift-dev at swift.org> wrote:
> 
> I ran build-script -x a few days ago. It didn't freeze, but it did take several hours to complete (on a late-model 13" MBP).
> 
> Austin
> 
> On Fri, May 20, 2016 at 2:28 PM, Will Stanton via swift-dev <swift-dev at swift.org <mailto:swift-dev at swift.org>> wrote:
> Hi Geoffrey,
> 
> Wanted to share I encountered this issue on 5/11.
> (Ninja build was+is fine.)
> 
> Maybe the first 8 gyb scripts to run (I’m on a 2012 Mac Mini) are not recognized as having finished…
> As you suggest, CPU of xcodebuild, cmake, and python processes were all 0.
> 
> Regards,
> Will Stanton
> 
> > On May 20, 2016, at 9:44 AM, Geoffrey Wiseman via swift-dev <swift-dev at swift.org <mailto:swift-dev at swift.org>> wrote:
> >
> > Hey,
> >
> > Let me start by saying I just checked out the Swift repos yesterday, and although i’ve looked at a little code and done some of the basic setup steps, this is pretty new to me, and I could easily be doing something wrong.
> >
> > Having said that, I wanted to set up Xcode so I could make a change, but when I run build-script -x, it goes for a while and then just seems to freeze — cpu usage drops off and nothing further seems to happen. I have let it sit for maybe ten minutes, but not hours.
> >
> > It is currently frozen in this section:
> > === BUILD AGGREGATE TARGET add_custom_command_target-b646e880e18661860c3d95b53adeee18-ExistentialCollection.swift OF PROJECT Swift WITH CONFIGURATION Debug ===
> >
> > After this line:
> > cd /Users/geoffrey/dev/work/opensource/swift/swift/stdlib/public/core && /Users/geoffrey/dev/work/opensource/swift/swift/utils/gyb --test -DunicodeGraphemeBreakPropertyFile=/Users/geoffrey/dev/work/opensource/swift/swift/utils/UnicodeData/GraphemeBreakProperty.txt -DunicodeGraphemeBreakTestFile=/Users/geoffrey/dev/work/opensource/swift/swift/utils/UnicodeData/GraphemeBreakTest.txt -DCMAKE_SIZEOF_VOID_P=8 -o /Users/geoffrey/dev/work/opensource/swift/build/Xcode-DebugAssert/swift-macosx-x86_64/stdlib/public/core/8/ExistentialCollection.swift.tmp ExistentialCollection.swift.gyb
> >
> > If I break and run it again, it seems to do roughly the same thing and freeze again with slightly different information:
> >
> > === BUILD AGGREGATE TARGET add_custom_command_target-c5582f2ec66110e6e1b09a999368ab26-Slice.swift OF PROJECT Swift WITH CONFIGURATION Debug ===
> >
> > …
> >
> > cd /Users/geoffrey/dev/work/opensource/swift/swift/stdlib/public/core && /Users/geoffrey/dev/work/opensource/swift/swift/utils/gyb --test -DunicodeGraphemeBreakPropertyFile=/Users/geoffrey/dev/work/opensource/swift/swift/utils/UnicodeData/GraphemeBreakProperty.txt -DunicodeGraphemeBreakTestFile=/Users/geoffrey/dev/work/opensource/swift/swift/utils/UnicodeData/GraphemeBreakTest.txt -DCMAKE_SIZEOF_VOID_P=8 -o /Users/geoffrey/dev/work/opensource/swift/build/Xcode-DebugAssert/swift-macosx-x86_64/stdlib/public/core/8/Slice.swift.tmp Slice.swift.gyb
> >
> > Any thoughts / suggestions? —verbose-build doesn’t seem to add any useful information. Something I’m doing?
> >
> 
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