Bug 512653 - kernel: use -fno-strict-overflow instead of -fwrapv [mrg-1]
kernel: use -fno-strict-overflow instead of -fwrapv [mrg-1]
Product: Red Hat Enterprise MRG
Classification: Red Hat
Component: realtime-kernel (Show other bugs)
All Linux
high Severity high
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Assigned To: Red Hat Real Time Maintenance
David Sommerseth
Depends On: 512650
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Reported: 2009-07-20 03:55 EDT by Eugene Teo (Security Response)
Modified: 2016-05-22 19:28 EDT (History)
4 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Clone Of: 512650
Last Closed: 2009-07-29 04:11:27 EDT
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Description Eugene Teo (Security Response) 2009-07-20 03:55:18 EDT
+++ This bug was initially created as a clone of Bug #512650 +++

Description of problem:
[PATCH] Don't use '-fwrapv' compiler option: it's buggy in gcc-4.1.x

This causes kernel images that don't run init to completion with certain broken gcc versions.

This fixes kernel bugzilla entry:

I suspect the gcc problem is this:

Fix the problem by using the -fno-strict-overflow flag instead, which not only does not exist in the known-to-be-broken versions of gcc (it was introduced later than fwrapv), but seems to be much less disturbing to gcc too: the difference in the generated code by -fno-strict-overflow are smaller (compared to using neither flag) than when using -fwrapv.

Upstream commit:

--- Additional comment from eteo@redhat.com on 2009-07-20 03:49:08 EDT ---

Related to bug 491264.

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