188635 2018-08-15 21:23:21 -0700 [Win] Visual Studio 2017 version 15.8 can't compile WebKit 2018-09-25 21:57:09 -0700 1 1 1 Unclassified WebKit Web Template Framework WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 fujii webkit-unassigned achristensen bfulgham don.olmstead mark.salisbury pvollan oldest_to_newest 1450582 0 fujii 2018-08-15 21:23:21 -0700 I upgraded VS today. It can't build ToT WebKit. Microsoft Visual Studio Professional 2017 Version 15.8.0 VisualStudio.15.Release/15.8.0+28010.0 Microsoft .NET Framework Version 4.7.02556 > 2>------ Build started: Project: WTF (WTF\WTF), Configuration: Debug x64 ------ > 2>TextBreakIterator.obj : error LNK2005: "public: static void (__cdecl*const * const WTF::__visitor_table<struct WTF::Visitor<class <lambda_4688178ac87a3efd1e417c3ce7f3aa28> >,class WTF::TextBreakIteratorICU,class WTF::NullTextBreakIterator>::__trampoline)(struct WTF::Visitor<class <lambda_4688178ac87a3efd1e417c3ce7f3aa28> > &,class WTF::Variant<class WTF::TextBreakIteratorICU,class WTF::NullTextBreakIterator> &)" (?__trampoline@?$__visitor_table@U?$Visitor@V<lambda_4688178ac87a3efd1e417c3ce7f3aa28>@@$$V@WTF@@VTextBreakIteratorICU@2@VNullTextBreakIterator@2@@WTF@@2QBQ6AXAEAU?$Visitor@V<lambda_4688178ac87a3efd1e417c3ce7f3aa28>@@$$V@2@AEAV?$Variant@VTextBreakIteratorICU@WTF@@VNullTextBreakIterator@2@@2@@ZB) already defined in StringView.obj > 2> Creating library C:/webkit/wa/WebKitBuild/Debug/lib64/WTF.lib and object C:/webkit/wa/WebKitBuild/Debug/lib64/WTF.exp > 2>C:\webkit\wa\WebKitBuild\Debug\bin64\WTF.dll : fatal error LNK1169: one or more multiply defined symbols found > 2>Done building project "WTF.vcxproj" -- FAILED. > ========== Build: 1 succeeded, 1 failed, 1 up-to-date, 0 skipped ========== 1450583 1 fujii 2018-08-15 21:26:34 -0700 another build log: https://gist.github.com/fujii/d8208ba24a38caa14f6f1b9198867d91 1450591 2 fujii 2018-08-15 21:58:30 -0700 https://blogs.msdn.microsoft.com/visualstudio/2018/08/14/visual-studio-2017-version-15-8/ 1451240 3 fujii 2018-08-17 15:18:09 -0700 https://twitter.com/stephantlavavej/status/1030543709295636480?s=21 1451892 4 mark.salisbury 2018-08-20 18:21:23 -0700 We are seeing this too. Thanks for working with Microsoft to get this fixed so fast! 1451895 5 mark.salisbury 2018-08-20 18:23:15 -0700 (In reply to Fujii Hironori from comment #3) > https://twitter.com/stephantlavavej/status/1030543709295636480?s=21 Wow! They're going to build WebKit before releasing Visual C++ compiler updates? 1456562 6 fujii 2018-09-04 17:48:41 -0700 According to Don, this issue will be fixed in 15.8.3. 1458804 7 fujii 2018-09-11 17:36:53 -0700 I confirmed version 15.8.3 also reports the same error. Is it a problem in WebKit side? 1463502 8 fujii 2018-09-25 21:01:04 -0700 https://docs.microsoft.com/en-us/visualstudio/releasenotes/vs2017-relnotes#-visual-studio-2017-version-1584 > Top Issues Fixed in 15.8.4 > These are the customer-reported issues addressed in 15.8.4: > > (..) > [WebKit] "Already defined symbol" for static template member definition (regression). 1463514 9 fujii 2018-09-25 21:57:09 -0700 This issue has been fixed, but another issue comes here. Filed: Bug 189987 – [Win] error C2139: 'WebKit::UpdateInfo': an undefined class is not allowed as an argument to compiler intrinsic type trait '__is_assignable'