Wireshark mailing list archives
Re: "Type-punned pointer... breaks anti-aliasing rules" in dfilter-macro.c
From: Evan Huus <eapache () gmail com>
Date: Tue, 18 Jun 2013 18:09:27 -0700
Probably the simplest fix is to add -fno-strict-aliasing to the build flags on FreeBSD. On 2013-06-18, at 4:14 PM, Stephen Fisher <stephenfisher-wireshark () outlook com> wrote:
When trying to compile Wireshark (SVN trunk) on FreeBSD for the first time in a long time, I ran across a familiar error: dfilter-macro.c: In function 'dfilter_macro_init': dfilter-macro.c:614: warning: dereferencing type-punned pointer will break strict-aliasing rules However, line 614 has a history of being changed between this: (void*) ¯os, and this (as it currently is): (void**) ¯os, Which is the fifth parameter in a call to uat_new() where parameter five's type is "void** data_ptr" and macros is type dfilter_macro_t*. This was most recently changed with SVN revision 48355 that Anders committed in response to bug 8416 ("remove C++ incompatibilities") according to the SVN log. Before that, judging by the "svn annotate" output in Emacs of a few lines earlier, I changed it from (void**) to (void*) way back in 2007 as SVN revision 21330 to "Fix warnings on Linux/gcc 4.1.1" and it may have changed at other times as well. What should the fix ultimately be if one way breaks FreeBSD/gcc 4.2.1 compiles and if it introduces C++ compatibility issues (which I'm not familiar with since I haven't been following development for a while lately). ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-request () wireshark org?subject=unsubscribe
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Current thread:
- "Type-punned pointer... breaks anti-aliasing rules" in dfilter-macro.c Stephen Fisher (Jun 18)
- Re: "Type-punned pointer... breaks anti-aliasing rules" in dfilter-macro.c Dirk Jagdmann (Jun 18)
- Re: "Type-punned pointer... breaks anti-aliasing rules" in dfilter-macro.c Evan Huus (Jun 18)