[SR-3219] swiftGlibc build order wrong(?)

[swift-ci]

Previous ID	SR-3219
Radar	None
Original Reporter	willstanton1@yahoo.com (JIRA User)
Type	Bug
Status	Resolved
Resolution	Done

Attachment: Download

Environment

Linux 4.4.30-32.54.amzn1.x86_64 #1 SMP Thu Nov 10 15:52:05 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Additional Detail from JIRA

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

md5: 8c3d5a13bc73ee07b8a58989dd877c62

Issue Description:

SwiftGlibc module is not generated when needed, sometimes?, causing build and build-script to stop.
1st occurrence for me, but https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20161107/003449.html encountered the issue recently and references other previous occurrences.

The error occurred on a clean build on AWS Linux like CentOS C++ 4.8 (in case it's regex related), cmake-3.6.3 (a couple days after an update from 3.6.2).

Calling `ninja make lib-swift-linux-x86_64-glibc.modulemap` after the error seemed to generate the SwiftGlibc module, allowing the build to proceed on re-invocation of the build script.
build.ninja attached, though I did tinker with it trying to solve the problem (possibly duplicating a build directive/target).

Build order may need to be verified.

The error encountered was (reproduced after failure of build-script):
[1/51] Compiling /home/ec2-user/swift/...b/public/Platform/linux/x86_64/Glibc.o
FAILED: stdlib/public/Platform/linux/x86_64/Glibc.o
cd /home/ec2-user/swift/build/Ninja-ReleaseAssert/swift-linux-x86_64/stdlib/public/Platform && /home/ec2-user/swift/swift/utils/line-directive /home/ec2-user/swift/swift/stdlib/public/Platform/Glibc.swift /home/ec2-user/swift/swift/stdlib/public/Platform/Platform.swift /home/ec2-user/swift/swift/stdlib/public/Platform/TiocConstants.swift /home/ec2-user/swift/build/Ninja-ReleaseAssert/swift-linux-x86_64/stdlib/public/Platform/8/tgmath.swift – /home/ec2-user/swift/build/Ninja-ReleaseAssert/swift-linux-x86_64/./bin/swiftc -c -sdk / -target x86_64-unknown-linux-gnu -resource-dir /home/ec2-user/swift/build/Ninja-ReleaseAssert/swift-linux-x86_64/./lib/swift -O -D INTERNAL_CHECKS_ENABLED -I /home/ec2-user/swift/build/Ninja-ReleaseAssert/swift-linux-x86_64/./lib/swift/linux/x86_64 -module-cache-path /home/ec2-user/swift/build/Ninja-ReleaseAssert/swift-linux-x86_64/./module-cache -no-link-objc-runtime -autolink-force-load -module-link-name swiftGlibc -force-single-frontend-invocation -parse-as-library -o /home/ec2-user/swift/build/Ninja-ReleaseAssert/swift-linux-x86_64/stdlib/public/Platform/linux/x86_64/Glibc.o /home/ec2-user/swift/swift/stdlib/public/Platform/Glibc.swift /home/ec2-user/swift/swift/stdlib/public/Platform/Platform.swift /home/ec2-user/swift/swift/stdlib/public/Platform/TiocConstants.swift /home/ec2-user/swift/build/Ninja-ReleaseAssert/swift-linux-x86_64/stdlib/public/Platform/8/tgmath.swift
/home/ec2-user/swift/swift/stdlib/public/Platform/Glibc.swift:13:19: error: no such module 'SwiftGlibc'
@_exported import SwiftGlibc // Clang module
^

[rintaro]

#5821
willstanton1@yahoo.com (JIRA User) While waiting for approval, could you try this patch?

[swift-ci]

Comment by W S (JIRA)

@rintaro Hoping to try within 24 hrs; thanks for taking a look!

[swift-ci]

Comment by Umberto Raimondi (JIRA)

Just to leave this documented somewhere, i got the same error compiling Swift on Raspbian Nov16 on a ARMv6 Raspberry1, so this could still be an issue sometime.

Running the same command suggested by W.S., that is now `ninja swiftGlibc-linux-armv6-static`, (from build/Ninja-ReleaseAssert/swift-linux-armv6/stdlib/public/Platform ) helped to get past that error and libswiftGlibc.so is where it should be now.