[Webkit-unassigned] [Bug 207757] New: [GStreamer][Stable] Build failure with Clang/libc++ due to missing WallTime→float for std::isnan()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207757

            Bug ID: 207757
           Summary: [GStreamer][Stable] Build failure with Clang/libc++
                    due to missing WallTime→float for std::isnan()
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aperez at igalia.com

WPE WebKit 2.27.90 (and most surely the GTK port as well) fail to build with
Clang when using libc++ (instead of GNU stdlibc++).

Configuration command:

  CC=clang CXX=clang++ \
  LDFLAGS='-stdlib=libc++ -fuse-ld=lld' \
  CXXLAGS='-stdlib=libc++' \
  cmake -DPORT=WPE -DUSE_LD_GOLD=OFF -DUSE_LD_LLD=ON <...>

Build error:

  ../Source/WebCore/platform/graphics/gstreamer/WebKitWebSourceGStreamer.cpp:1155:10: error: no matching function for call to 'isnan'
      if (!isnan(priv->downloadStartTime)) {
           ^~~~~
  /usr/bin/../include/c++/v1/math.h:535:1: note: candidate function not viable: no known conversion from 'WTF::WallTime' to 'float' for 1st argument
  isnan(float __lcpp_x) _NOEXCEPT { return __libcpp_isnan(__lcpp_x); }
  ^
  /usr/bin/../include/c++/v1/math.h:539:1: note: candidate function not viable: no known conversion from 'WTF::WallTime' to 'double' for 1st argument
  isnan(double __lcpp_x) _NOEXCEPT { return __libcpp_isnan(__lcpp_x); }
  ^
  /usr/bin/../include/c++/v1/math.h:543:1: note: candidate function not viable: no known conversion from 'WTF::WallTime' to 'long double' for 1st argument
  isnan(long double __lcpp_x) _NOEXCEPT { return __libcpp_isnan(__lcpp_x); }
  ^
  /usr/bin/../include/c++/v1/math.h:521:1: note: candidate template ignored: requirement 'std::is_floating_point<WTF::WallTime>::value' was not satisfied [with _A1 = WTF::WallTime]
  isnan(_A1 __lcpp_x) _NOEXCEPT
  ^
  /usr/bin/../include/c++/v1/math.h:529:1: note: candidate template ignored: requirement 'std::is_integral<WTF::WallTime>::value' was not satisfied [with _A1 = WTF::WallTime]
  isnan(_A1) _NOEXCEPT
  ^
  1 error generated.

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