[Webkit-unassigned] [Bug 25857] New: new dtoa.cpp strict-aliasing issues with gcc 4.4

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=25857

           Summary: new dtoa.cpp strict-aliasing issues with gcc 4.4
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Web Template Framework
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: craig.schlenter at gmail.com
                CC: xan.lopez at gmail.com


dtoa.cpp is getting strict aliasing warnings again in trunk with gcc 4.4 after
the latest changes. I'm running this in chromium but it's the same code as far
as I can tell.

/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp: In
function 'void WTF::mult(WTF::BigInt&, const WTF::BigInt&)':
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:505:
warning: dereferencing pointer '<anonymous>' does break strict-aliasing rules
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:505:
note: initialized from here
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:505:
warning: dereferencing pointer 'xc.43' does break strict-aliasing rules
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:505:
note: initialized from here
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:517:
warning: dereferencing pointer '<anonymous>' does break strict-aliasing rules
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:517:
note: initialized from here
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:517:
warning: dereferencing pointer 'xc.43' does break strict-aliasing rules
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:517:
note: initialized from here
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp: In
function 'void WTF::dtoa(char*, double, int, int*, int*, char**)':
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:293:
warning: '<anonymous>' may be used uninitialized in this function
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:2135:
note: '<anonymous>' was declared here
Compiling
/home/craig/chromium.git/src/sconsbuild/Release/obj/third_party/WebKit/JavaScriptCore/pcre/pcre_compile.os
Compiling
/home/craig/chromium.git/src/sconsbuild/Release/obj/third_party/WebKit/JavaScriptCore/pcre/pcre_exec.os
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp: In
function 'double WTF::strtod(const char*, char**)':
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:736:
warning: dereferencing pointer 'xc.62' does break strict-aliasing rules
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:736:
note: initialized from here
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:736:
warning: dereferencing pointer '<anonymous>' does break strict-aliasing rules
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:736:
note: initialized from here
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:743:
warning: dereferencing pointer 'xc.62' does break strict-aliasing rules
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:743:
note: initialized from here
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:743:
warning: dereferencing pointer '<anonymous>' does break strict-aliasing rules
/home/craig/chromium.git/src/third_party/WebKit/JavaScriptCore/wtf/dtoa.cpp:743:
note: initialized from here

Rolling back to r42264 makes things happy - I have not tried the in-between
revisions yet.

Thank you.

The 42264 changes here were discussed here:
https://bugs.webkit.org/show_bug.cgi?id=25033


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