On 06/11/2012 08:24 AM, Marc Hoersken wrote:
> Hello everyone,
>
> I am currently taking a look at the results and especially warnings
> from the curl autobuillds.
>
> For example this one here contains quite a lot of dereferencing
> pointer warnings:
>
> http://curl.haxx.se/dev/log.cgi?id=20120610222524-3999#prob1
>
> ../.././lib/ftp.c:1254: warning: dereferencing pointer 'sa' does break
> strict-aliasing rules
> ../.././lib/ftp.c:1089: warning: dereferencing pointer 'sa' does break
> strict-aliasing rules
> ../.././lib/ftp.c:1085: warning: dereferencing pointer 'sa' does break
> strict-aliasing rules
> ../.././lib/ftp.c:1082: warning: dereferencing pointer 'sa' does break
> strict-aliasing rules
> ../.././lib/ftp.c:1141: warning: dereferencing pointer 'sa' does break
> strict-aliasing rules
> ../.././lib/ftp.c:1227: warning: dereferencing pointer 'sa' does break
> strict-aliasing rules
> ../.././lib/ftp.c:1231: warning: dereferencing pointer 'sa' does break
> strict-aliasing rules
> ../.././lib/ftp.c:961: note: initialized from here
> ../.././lib/ftp.c:1145: warning: dereferencing pointer 'sa6' does
> break strict-aliasing rules
> ../.././lib/ftp.c:1237: warning: dereferencing pointer 'sa6' does
> break strict-aliasing rules
> ../.././lib/ftp.c:964: note: initialized from here
> ../.././lib/ftp.c:1142: warning: dereferencing pointer 'sa4' does
> break strict-aliasing rules
> ../.././lib/ftp.c:1233: warning: dereferencing pointer 'sa4' does
> break strict-aliasing rules
> ../.././lib/ftp.c:962: note: initialized from here
>
> http://curl.haxx.se/dev/log.cgi?id=20120610222524-3999#prob15
>
> ../.././lib/connect.c:377: warning: dereferencing pointer 'si6' does
> break strict-aliasing rules
> ../.././lib/connect.c:378: warning: dereferencing pointer 'si6' does
> break strict-aliasing rules
> ../.././lib/connect.c:401: warning: dereferencing pointer 'si6' does
> break strict-aliasing rules
> ../.././lib/connect.c:402: warning: dereferencing pointer 'si6' does
> break strict-aliasing rules
> ../.././lib/connect.c:439: warning: dereferencing pointer 'si6' does
> break strict-aliasing rules
> ../.././lib/connect.c:260: note: initialized from here
> ../.././lib/connect.c:386: warning: dereferencing pointer 'si4' does
> break strict-aliasing rules
> ../.././lib/connect.c:387: warning: dereferencing pointer 'si4' does
> break strict-aliasing rules
> ../.././lib/connect.c:408: warning: dereferencing pointer 'si4' does
> break strict-aliasing rules
> ../.././lib/connect.c:409: warning: dereferencing pointer 'si4' does
> break strict-aliasing rules
> ../.././lib/connect.c:436: warning: dereferencing pointer 'si4' does
> break strict-aliasing rules
> ../.././lib/connect.c:258: note: initialized from here
> ../.././lib/connect.c:435: warning: dereferencing pointer 'sock' does
> break strict-aliasing rules
> ../.././lib/connect.c:256: note: initialized from here
>
> I have searched around and found this related stackoverflow question:
> http://stackoverflow.com/questions/3464888/
>
> It seems like this is a gcc problem that cannot be fixed easily.
> Anyway, I just wanted to inform you about these warnings and ask if
> anyone knows a solution for them.

You probably want to use unions:

https://bugzilla.redhat.com/show_bug.cgi?id=448743#c6

Paul.
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Received on 2012-06-11