[webkit-dev] Compilation issue with VS2015RC

Vienneau, Christopher cvienneau at ea.com
Fri Jul 10 16:35:55 PDT 2015

A brief look at your patch shows similar changes that I have done, I’ll investigate the additional changes which seem to relate to the linker error.  I’ll keep my eye on this bug now.

Many Thanks

From: Brent Fulgham [mailto:bfulgham at apple.com]
Sent: Friday, July 10, 2015 4:30 PM
To: Vienneau, Christopher
Cc: Webkit Development List
Subject: Re: [webkit-dev] Compilation issue with VS2015RC

Hi Chris,

We noticed the same thing. Please see <https://bugs.webkit.org/show_bug.cgi?id=146579>, where we are discussing how to move forward.



On Jul 10, 2015, at 4:05 PM, Vienneau, Christopher <cvienneau at ea.com<mailto:cvienneau at ea.com>> wrote:


Recently we’ve been attempting to move our code base to build with VS2015 RC since this provides us with some support that we’ll be needing in the future for our products.  The changes for compilation with the new compiler haven’t been too bad, and I have everything building with the exception of one line:

FILE: JSCSSValueCustom.cpp
67           JSValue toJS(ExecState*, JSDOMGlobalObject* globalObject, CSSValue* value)
68           {
69               if (!value)
70                   return jsNull();
72               // Scripts should only ever see cloned CSSValues, never the internal ones.
73               ASSERT(value->isCSSOMSafe());
75               // If we're here under erroneous circumstances, prefer returning null over a potentially insecure value.
76               if (!value->isCSSOMSafe())
77                   return jsNull();
79               JSObject* wrapper = getCachedWrapper(globalObject->world(), value);
81               if (wrapper)
82                   return wrapper;
84               if (value->isWebKitCSSTransformValue())
85                   wrapper = CREATE_DOM_WRAPPER(globalObject, WebKitCSSTransformValue, value);
86               else if (value->isWebKitCSSFilterValue())
87                   wrapper = CREATE_DOM_WRAPPER(globalObject, WebKitCSSFilterValue, value);
88               else if (value->isValueList())
89                   wrapper = CREATE_DOM_WRAPPER(globalObject, CSSValueList, value);
90               else if (value->isSVGPaint())
91                   wrapper = CREATE_DOM_WRAPPER(globalObject, SVGPaint, value);
92               else if (value->isSVGColor())
93                   wrapper = CREATE_DOM_WRAPPER(globalObject, SVGColor, value);
94               else if (value->isPrimitiveValue())
95                   wrapper = CREATE_DOM_WRAPPER(globalObject, CSSPrimitiveValue, value);
96               else
97                   wrapper = CREATE_DOM_WRAPPER(globalObject, CSSValue, value);
99               return wrapper;
100         }

It produces the linker error:
JSBindingsAllInOne.obj : error LNK2019: unresolved external symbol "public: __thiscall WebCore::CSSPrimitiveValue::operator<class WTF::Ref<class WebCore::CSSPrimitiveValue> > class WTF::Ref<class WebCore::CSSPrimitiveValue>(void)const " (??$?BV?$Ref at VCSSPrimitiveValue@WebCore@@@WTF@@@CSSPrimitiveValue at WebCore@@QBE?AV?$Ref at VCSSPrimitiveValue@WebCore@@@WTF@@XZ) referenced in function "class WebCore::JSDOMWrapper * __cdecl WebCore::createWrapper<class WebCore::JSCSSPrimitiveValue,class WebCore::CSSPrimitiveValue>(class WebCore::JSDOMGlobalObject *,class WebCore::CSSPrimitiveValue *)" (??$createWrapper at VJSCSSPrimitiveValue@WebCore@@VCSSPrimitiveValue at 2@@WebCore@@YAPAVJSDOMWrapper at 0@PAVJSDOMGlobalObject at 0@PAVCSSPrimitiveValue at 0@@Z)

As you can see there are many other similar code lines in the area, none of which cause a problem.  Despite my many attempts I can’t seem to satisfy the linker by providing it the definition it needs.
•         I’ve attempted manually adding the copy constructor definition (I believe that is what it is describing):
o   CSSPrimitiveValue::CSSPrimitiveValue(ClassType classType, const CSSPrimitiveValue& cloneFrom)
o   CSSPrimitiveValue::CSSPrimitiveValue(const CSSPrimitiveValue& cloneFrom)
•         I’ve tried removing the usage of the “AllInOne” file, thinking that it may be causing some issue.
•         I’ve attempted to debug the code when the offending line is commented out, hoping to see better how the other lines function.  Though I’m not sure what path would cause it to execute, I haven’t hit it in my limited testing.
•         One of my colleagues reached out the MS on the issue, but it behaves as expect on their end (small sample code does not find a bug in the compiler). https://social.msdn.microsoft.com/Forums/en-US/6b9787f3-62bd-473a-8aa1-5f6cd85ed87b/breaking-change-in-visual-studio-2015-rc?forum=vcgeneral

Any suggestions would be much appreciated



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