#8773: GCC-4.5.0 breaks GAP -- the workspace is broken, hence gap('2+2') fails.
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Reporter: was | Owner: GeorgSWeber
Type: defect | Status: new
Priority: blocker | Milestone: sage-4.4.1
Component: build | Keywords:
Author: | Upstream: Reported upstream. Little or no feedback.
Reviewer: | Merged:
Work_issues: |
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Comment(by wjp):
The issue here seems to be that gap is returning a {{{StructInitInfo*}}}
from {{{SyFindOrLinkGapRootFile}}} inside a char buffer. In the process of
extracting the pointer again in {{{READ_GAP_ROOT}}}, gap might be breaking
strict aliasing rules.
I think that ideally this method of returning values should be removed
entirely (since it seems to serve no purpose), and
{{{SyFindOrLinkGapRootFile}}} should just get an extra argument of type
{{{StructInitInfo**}}} for returning this pointer.
Incidentally gcc 4.5.0 also complains about a similar issue in
{{{SaveDouble}}}, {{{LoadDouble}}}. Although that seems to be currently
working, using a union there might be safer than casting directly.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8773#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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