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Bug 1410952

Summary:	rust FTBFS with LLVM 3.8 on s390x
Product:	[Fedora] Fedora	Reporter:	Josh Stone <jistone>
Component:	rust	Assignee:	Rust SIG <rust-sig>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	25	CC:	ajax, bos, dan, davejohansen, dmalcolm, extras-qa, hannsj_uhl, jistone, petersen, scottt.tw, TicoTimo
Target Milestone:	---
Target Release:	---
Hardware:	s390x
OS:	Linux
Whiteboard:
Fixed In Version:	rust-1.18.0-1.fc25	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1410950	Environment:
Last Closed:	2017-06-20 13:48:52 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1410950, 1412204
Bug Blocks:	467765

Description Josh Stone 2017-01-06 23:37:23 UTC

+++ This bug was initially created as a clone of Bug #1410950 +++

Description of problem:
Attempts to bootstrap Rust on s390x failed with an LLVM ERROR on f24 and f25.  The same srpm on f26 (with LLVM 3.9) is fine.

f24: https://s390.koji.fedoraproject.org/koji/taskinfo?taskID=2439756
f25: https://s390.koji.fedoraproject.org/koji/taskinfo?taskID=2439754

Version-Release number of selected component (if applicable):
llvm-3.8.0-1.fc25/24
building rust-1.14.0-1.fc25/24

How reproducible:
100%

Steps to Reproduce:
1. rpmbuild --rebuild rust-1.14.0-1.fc25.src.rpm
(or try again on s390.koji)

Actual results:
LLVM ERROR: Cannot select: 0x3ff793b6d90: ch = AtomicFence 0x3ff70818a70, Constant:i64<4>, Constant:i64<1>
  0x3ff728d89c0: i64 = Constant<4>
  0x3ff793b7120: i64 = Constant<1>
In function: _ZN33_$LT$alloc..arc..Arc$LT$T$GT$$GT$9drop_slow17h19a3f415d8721b31E

Expected results:
no compiler errors :)

Additional info:
A similar problem was reported upstream for compiling v8 with Clang 3.8, then closed when it was found to work with 3.9.  That's probably a simpler reproducer.
https://llvm.org/bugs/show_bug.cgi?id=28735

Also, the rawhide builds of Rust with LLVM 3.9 were fine:
https://s390.koji.fedoraproject.org/koji/buildinfo?buildID=449416
https://s390.koji.fedoraproject.org/koji/buildinfo?buildID=449417

Comment 1 Fedora Admin XMLRPC Client 2017-01-24 18:42:00 UTC

This package has changed ownership in the Fedora Package Database.  Reassigning to the new owner of this component.

Comment 2 Dan Horák 2017-05-10 13:07:27 UTC

Because there is now llvm 3.9 in F-25 for some time it should be possible to get Rust built there too. I'll try some tricks :-)

Comment 3 Dan Horák 2017-06-20 13:48:52 UTC

I've rebuilt the "old" portion of the rust stack with llvm 3.9 instead of llvm 3.8 and all went well till the latest rust and cargo.