[SR-13897] Can't build swift-llbuild2 with development Swift toolchain

[swift-ci]

Previous ID	SR-13897
Radar	rdar://problem/71914389
Original Reporter	Davidee (JIRA User)
Type	Bug

Additional Detail from JIRA

Votes	0
Component/s	llbuild
Labels	Bug
Assignee	None
Priority	Medium

md5: a5c2c7c803ccfeebebc1bca5b3ec7d96

Issue Description:

While working on a reproducer for https://bugs.swift.org/browse/SR-13895 I was able to get it to reproduce while using swift-llbuild2, but I couldn't dig into the issue myself with a development Swift toolchain since I can't get swift-llbuild2 to build with either a locally build Swift toolchain or the latest development toolchain snapshot from https://swift.org/download/.

Logs: https://gist.github.com/DavidGoldman/933260ebc751ffe486c1537f0af4d8b6

❯ swift build                                                                                                                                                                In file included from /Users/davg/dev/github/swift-llbuild2/.build/checkouts/swift-nio-ssl/Sources/CNIOBoringSSL/ssl/tls_record.cc:109:In file included from /Users/davg/dev/github/swift-llbuild2/.build/checkouts/swift-nio-ssl/Sources/CNIOBoringSSL/include/CNIOBoringSSL_ssl.h:149:In file included from /Users/davg/dev/github/swift-llbuild2/.build/checkouts/swift-nio-ssl/Sources/CNIOBoringSSL/include/CNIOBoringSSL_pem.h:67:In file included from /Users/davg/dev/github/swift-llbuild2/.build/checkouts/swift-nio-ssl/Sources/CNIOBoringSSL/include/CNIOBoringSSL_x509.h:76:In file included from /Users/davg/dev/github/swift-llbuild2/.build/checkouts/swift-nio-ssl/Sources/CNIOBoringSSL/include/CNIOBoringSSL_obj.h:62:20:/Users/davg/dev/github/swift-llbuild2/.build/checkouts/swift-nio-ssl/Sources/CNIOBoringSSL/include/CNIOBoringSSL_span.h:139:7: error: missing '#include <stdlib.h>'; 'abort' must be declared before it is used      abort();      ^/Applications/Xcode_12.0.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/stdlib.h:131:7: note: declaration here is not visiblevoid     abort(void) __cold __dead2;         ^

[typesanitizer]

@swift-ci create

[dmbryson]

I think this issue is long stale. llbuild2 successfully builds with recent toolchains.