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Bug 1711346

Summary:	Backport workaround for broken C/C++ wrappers to LAPACK
Product:	Red Hat Enterprise Linux 8	Reporter:	Marek Polacek <mpolacek>
Component:	gcc	Assignee:	Marek Polacek <mpolacek>
gcc sub component:	system-version	QA Contact:	Alexandra Petlanová Hájková <ahajkova>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	unspecified
Priority:	unspecified	CC:	ahajkova, fweimer, jakub, law, mcermak, mnewsome, mpetlan, ohudlick
Version:	8.1	Flags:	pm-rhel: mirror+
Target Milestone:	rc
Target Release:	8.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	gcc-8.3.1-4.4.el8	Doc Type:	Bug Fix
Doc Text:	Previously, invalid C/C++ wrappers calling Fortran subroutines with single-character string arguments that failed to include the hidden string length argument could cause a crash at run-time. The crash could occur because when tail call optimization takes place, the caller's arguments are overwritten, which could have lead to stack corruption if the string length argument hadn't been provided. GCC offers a workaround for this problem; the -ftail-call-workaround option is now available, which disables tail call optimization for Fortran subroutines with character arguments. Red Hat recommends that users fix the C/C++ wrappers instead of using this workaround option.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-11-05 22:16:40 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:

Description Marek Polacek 2019-05-17 14:42:26 UTC

This came recently in BZ 1709538.  Jakub submitted a patch implementing a workaround for such wrong code upstream:
https://gcc.gnu.org/ml/gcc-patches/2019-05/msg00915.html

We should probably include this patch in out RHEL 8 system compiler.

Comment 8 errata-xmlrpc 2019-11-05 22:16:40 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:3565