[Webkit-unassigned] [Bug 189732] New: [Win][Clang] UNUSED_PARAM(this) causes compilation error of "cannot take the address of an rvalue of type"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189732

            Bug ID: 189732
           Summary: [Win][Clang] UNUSED_PARAM(this) causes compilation
                    error of "cannot take the address of an rvalue of
                    type"
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Hironori.Fujii at sony.com
            Blocks: 171618

[Win][Clang] UNUSED_PARAM(this) causes compilation error of "cannot take the address of an rvalue of type"

While doing Bug 171618, following compilation error is reported.

> [16/31] Building CXX object Source\WebKit\CMakeFiles\WebKit.dir\__\__\DerivedSources\WebKit\unified-sources\UnifiedSource22.cpp.obj
> FAILED: Source/WebKit/CMakeFiles/WebKit.dir/__/__/DerivedSources/WebKit/unified-sources/UnifiedSource22.cpp.obj 
> C:\tools\llvm\bin\clang-cl.exe (...) -c DerivedSources\WebKit\unified-sources\UnifiedSource22.cpp
> In file included from DerivedSources\WebKit\unified-sources\UnifiedSource22.cpp:5:
> ..\..\Source\WebKit\UIProcess/Network/NetworkProcessProxy.cpp(154,9):  error: cannot take the address of an rvalue of type 'WebKit::NetworkProcessProxy *'
>         UNUSED_PARAM(this);
>         ^            ~~~~
> DerivedSources\ForwardingHeaders\wtf/Compiler.h(367,38):  note: expanded from macro 'UNUSED_PARAM'
> #define UNUSED_PARAM(variable) (void)&variable
>                                      ^~~~~~~~~
> In file included from DerivedSources\WebKit\unified-sources\UnifiedSource22.cpp:5:
> ..\..\Source\WebKit\UIProcess/Network/NetworkProcessProxy.cpp(171,9):  error: cannot take the address of an rvalue of type 'WebKit::NetworkProcessProxy *'
>         UNUSED_PARAM(this);
>         ^            ~~~~
> DerivedSources\ForwardingHeaders\wtf/Compiler.h(367,38):  note: expanded from macro 'UNUSED_PARAM'
> #define UNUSED_PARAM(variable) (void)&variable
>                                      ^~~~~~~~~
> In file included from DerivedSources\WebKit\unified-sources\UnifiedSource22.cpp:5:
> ..\..\Source\WebKit\UIProcess/Network/NetworkProcessProxy.cpp(189,9):  error: cannot take the address of an rvalue of type 'WebKit::NetworkProcessProxy *'
>         UNUSED_PARAM(this);
>         ^            ~~~~
> DerivedSources\ForwardingHeaders\wtf/Compiler.h(367,38):  note: expanded from macro 'UNUSED_PARAM'
> #define UNUSED_PARAM(variable) (void)&variable
>                                      ^~~~~~~~~
> 3 errors generated.


See Also:

Bug 113440 – [WinCE] Add workaround for UNUSED_PARAM()
Bug 115350 – [WIN] Add workaround for UNUSED_PARAM()


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=171618
[Bug 171618] [Win][Meta] Build WebKit using Clang
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