[SR-3486] Swift compier won't finish compiling source code

[swift-ci]

Previous ID	SR-3486
Radar	None
Original Reporter	Okui (JIRA User)
Type	Bug
Status	Resolved
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, OptimizedOnly
Assignee	None
Priority	Medium

md5: 4e77380daea83b4bb994bf3f051fc5bb

Issue Description:

I recently update my project from Swift 2.3 to Swift 3. All codes are migrated well and working fine with debug build and optimize build. However, if I turn on Whole Module Optimization on, compiler won't finish compiling code. (Xcode stuck "Compiling Swift source files")

Clean build, clean DerivedData does not work. In activity monitor, swift gets 100% cpu usage, so it's not waiting something but probably falling into infinite loop.

Since compiler does not generate any messages, I don't know where to begin to troubleshoot. Is there any way I can set Xcode or xcodebuild to generate more detailed logs to see where compiler hangs?

[belkadan]

If you kill the child swift process (there should be two) the log might have a little more information, but I think mostly we'll need your project to be any help. If you're not comfortable sharing it publicly you can file it just with us from Apple at bugreport.apple.com.

[swift-ci]

Comment by Kaz Okui (JIRA)

Yeah, I killed swift process via Activity Monitor and get this:

<unknown>:0: error: unable to execute command: Terminated: 15
<unknown>:0: error: compile command failed due to signal (use -v to see invocation)

Then I tried using terminal and send `HUP`, just return signal number 1 instead of 5 and no other messages.

So, I guess I'll submit my code to apple's bug reporter then.

[swift-ci]

Comment by Kaz Okui (JIRA)

Submitted radar: #29895164

[swift-ci]

Comment by Kaz Okui (JIRA)

FYI, downloaded latest development build of swift compiler toolchain from https://swift.org/builds/development/xcode/swift-DEVELOPMENT-SNAPSHOT-2017-01-14-a/swift-DEVELOPMENT-SNAPSHOT-2017-01-14-a-osx.pkg which can finish building my project without halt nor error. Not sure some changes are made specifically for this issue or not since there's no update on this thread.

[belkadan]

Ah, yes, shajrawi (JIRA User) forgot to update the public bug with the fix. #6799

[belkadan]

…"forgot" might be a little strong. Once you're using Radar, sometimes the changes count as Apple internal information and we don't get to tell you about them until an Xcode beta comes out. But in this case I don't see any harm.

[swift-ci]

Comment by Kaz Okui (JIRA)

ah, got it!