[SR-13901] Xcode 12 Swift toolchain regression - Combine - Abort trap: 6

[swift-ci]

Previous ID	SR-13901
Radar	rdar://problem/71849530
Original Reporter	apouche (JIRA User)
Type	Bug

Attachment: Download

Environment

Xcode 12.2 regression. Worked fine with Xcode 11.7.

The crash seem to specifically occur when using Combine framework and @Published variables

Additional Detail from JIRA

Votes	1
Component/s	Compiler
Labels	Bug
Assignee	None
Priority	Medium

md5: 1c6a399af4a9b20d6703c45b3464f284

Issue Description:

In the attached sample project there's a regression between the swift toolchain from Xcode 11.7 and Xcode 12.2. The compiler seg faults during compilation if SWIFT_COMPILATION_MODE is set to Incremental

Step to reproduce:

1. Unzip attached project

2. Open JF.xcworkspace

3. Compile JF Target

4. Notice how the compiler seg fault while compiling EnterInviteCodeViewController class

[hborla]

@swift-ci create

[swift-ci]

Comment by Johan Attali (JIRA)

Any feedback on this ? This is preventing us from using Xcode 12 on our project.