[SR-8854] swift-4.2-RELEASE archive does not contain libdispatch.a

[kevints]

Previous ID	SR-8854
Radar	None
Original Reporter	@kevints
Type	Bug
Status	Resolved
Resolution	Done

Environment

Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty

Swift version 4.2 (swift-4.2-RELEASE)
Target: x86_64-unknown-linux-gnu

Additional Detail from JIRA

Votes	0
Component/s	libdispatch
Labels	Bug
Assignee	@kevints
Priority	Medium

md5: cbef0d1252adf69684fd06fc9a6414be

Issue Description:

The swift-4.2-RELEASE tarball does not contain the static archive libdispatch.a.

This means the -static-stdlib compilation flag is broken for programs that import Dispatch or Foundation.

...
/root/.swift/usr/lib/swift_static/linux/libFoundation.a(CFSortFunctions.c.o):CFSortFunctions.c:function CFSortIndexes: error: undefined reference to '_dispatch_queue_attr_concurrent'
/root/.swift/usr/lib/swift_static/linux/libFoundation.a(CFSortFunctions.c.o):CFSortFunctions.c:function CFSortIndexes: error: undefined reference to 'dispatch_queue_create'
/root/.swift/usr/lib/swift_static/linux/libFoundation.a(CFSortFunctions.c.o):CFSortFunctions.c:function CFSortIndexes: error: undefined reference to 'dispatch_apply'
/root/.swift/usr/lib/swift_static/linux/libFoundation.a(CFSortFunctions.c.o):CFSortFunctions.c:function __CFSortIndexesN: error: undefined reference to 'dispatch_apply'
/root/.swift/usr/lib/swift_static/linux/libFoundation.a(CFSortFunctions.c.o):CFSortFunctions.c:function __CFSortIndexesN: error: undefined reference to 'dispatch_apply'
...

[belkadan]

cc mww (JIRA User), dgrove-oss (JIRA User), @compnerd

[kevints]

PR: #393

[compnerd]

I just merged a change for this (swiftlang/swift#20793 The CI toolchain build includeded libdispatch.a in swift_static.