0004628: assuan-uds.c:211:3: warning: dereferencing type-punned pointer will break strict-aliasing rules

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0004628

[libassuan0] other

trivial

always

2010-12-07 19:29

2010-12-08 16:47

Reporter

c1pher

View Status

public

Assigned To

dam

Priority

normal

Resolution

no change required

Status

closed

Summary

0004628: assuan-uds.c:211:3: warning: dereferencing type-punned pointer will break strict-aliasing rules

Description

Small Quality Assurance issue.

To quote the Gentoo bug report:
The most common warning you will see is probably "dereferencing type-
punned pointer will break strict-aliasing rules". The place where it
warns is in general not wrong -- what gcc tries to tell you is that you
will break the aliasing rules when you dereference the pointer later
(unless you cast it back to its original type first). This warning
should be interpreted as saying that your interfaces are badly designed,
and the correct way to avoid the warning is to redesign them in a way
where you do not need to cast between conflicting types. (Even if you
often can make this warning go away by changing void** to void*...) >>

Please read the actual standard too. The rules about pointer type
conversions are at 6.3.2.3. The appropriate paragraphs are paragraphs
1 and 7.

http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1124.pdf. [^]

Our bug report is located at: http://bugs.gentoo.org/show_bug.cgi?id=347807 [^]

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Notes
(0008542) dam (administrator) 2010-12-08 16:19	From reading your gentoo bug report I get the impression you think OpenCSW is the upstream project for libassuan. This is not the case. OpenCSW is a packaging project like gentoo. If you have upstream bugs regarding libassuan please report them at the libassuan bugtracker site at http://gnupg.org/documentation/bts.en.html [^]

(0008543) c1pher (reporter) 2010-12-08 16:45	My apologies. I submitted it with gnupg. Feel free to close this. Sorry for the confusion.