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defineTest(isPlatformSupported) {
  linux {
    !gcc:!clang {
      skipBuild("Qt WebEngine on Linux requires clang or GCC.")
      return(false)
    }
    gcc:!clang:!isGCCVersionSupported(): return(false)
  } else:win32 {
    winrt {
      skipBuild("WinRT is not supported.")
      return(false)
    }
    msvc {
      !equals(MSVC_VER, "12.0"):!equals(MSVC_VER, "14.0") {
        skipBuild("Qt WebEngine on Windows requires MSVC 2013 or MSVC 2015.")
        return(false)
      }
    } else {
      skipBuild("Qt WebEngine on Windows requires MSVC 2013 or MSVC 2015.")
      return(false)
    }
    isBuildingOnWin32() {
      skipBuild("Qt WebEngine on Windows must be built on a 64-bit machine.")
    }
  } else:osx {
    lessThan(QMAKE_XCODE_VERSION, 6.1) {
      skipBuild("Using XCode version $$QMAKE_XCODE_VERSION, but at least version 6.1 is required to build Qt WebEngine.")
      return(false)
    }
    # We require OS X 10.9 (darwin version 13.0.0) or newer
    darwin_major_version = $$section(QMAKE_HOST.version, ., 0, 0)
    lessThan(darwin_major_version, 13) {
      skipBuild("Qt WebEngine requires OS X version 10.9 or newer.")
      return(false)
    }
    !isMinOSXSDKVersion(10, 10): {
      skipBuild("Qt WebEngine requires an OS X SDK version of 10.10 or newer. Current version is $${WEBENGINE_OSX_SDK_PRODUCT_VERSION}.")
      return(false)
    }
  } else {
    skipBuild("Unknown platform. Qt WebEngine only supports Linux, Windows, and OS X.")
    return(false)
  }

  !contains(QT_CONFIG, c++11) {
    skipBuild("C++11 support is required in order to build chromium.")
    return(false)
  }
  contains(QT_CONFIG, mirclient) {
    skipBuild("Mir is not yet supported as graphics backend for Qt WebEngine.")
    return(false)
  }
  static {
    skipBuild("Static builds of QtWebEngine aren't supported.")
    return(false)
  }
  !isPythonVersionSupported(): return(false)
  !isArchSupported(): return(false)
  return(true)
}

defineTest(isArchSupported) {
    contains(QT_ARCH, "i386")|contains(QT_ARCH, "x86_64"): return(true)
    contains(QT_ARCH, "arm")|contains(QT_ARCH, "arm64"): return(true)
    contains(QT_ARCH, "mips")|contains(QT_ARCH, "mips64"): return(true)

    skipBuild("QtWebEngine can only be built for x86, x86-64, ARM, Aarch64, MIPSel, and MIPS64 architectures.")
    return(false)
}

defineTest(isPythonVersionSupported) {
    python_error_msg = "Python version 2 (2.7.5 or later) is required to build Qt WebEngine."
    python_version = $$system('python -c "import sys; print(sys.version_info[0:3])"')
    python_version ~= s/[()]//g
    python_version = $$split(python_version, ',')
    python_major_version = $$first(python_version)
    greaterThan(python_major_version, 2) {
        skipBuild("Python version 3 is not supported by Chromium.")
        skipBuild($$python_error_msg)
        return(false)
    }
    python_minor_version = $$member(python_version, 1)
    python_patch_version = $$member(python_version, 2)
    greaterThan(python_major_version, 1): greaterThan(python_minor_version, 6): greaterThan(python_patch_version, 4): return(true)
    skipBuild("Using Python version $${python_major_version}.$${python_minor_version}.$${python_patch_version}.")
    skipBuild($$python_error_msg)
    return(false)
}

defineTest(isGCCVersionSupported) {
  # The below will work for gcc 4.7 and up and also match gcc 5
  greaterThan(QT_GCC_MINOR_VERSION, 6):return(true)
  greaterThan(QT_GCC_MAJOR_VERSION, 4):return(true)
  skipBuild("Using gcc version "$$QT_GCC_MAJOR_VERSION"."$$QT_GCC_MINOR_VERSION", but at least gcc version 4.7 is required to build Qt WebEngine.")
  return(false)
}

defineTest(isQMLTestSupportApiEnabled) {
    contains(QT_CONFIG, private_tests): return(true) # enable for developer-build
    contains(QT_BUILD_PARTS, tests): return(true)
    contains(WEBENGINE_CONFIG, testsupport): return(true)
    return(false)
}

defineTest(isBuildingOnWin32) {
    # The check below is ugly, but necessary, as it seems to be the only reliable way to detect if the host
    # architecture is 32 bit. QMAKE_HOST.arch does not work as it returns the architecture that the toolchain
    # is building for, not the system's actual architecture.
    PROGRAM_FILES_X86 = $$(ProgramW6432)
    isEmpty(PROGRAM_FILES_X86): return(true)
    return(false)
}

defineTest(isMinOSXSDKVersion) {
    requested_major = $$1
    requested_minor = $$2
    requested_patch = $$3
    isEmpty(requested_patch): requested_patch = 0
    WEBENGINE_OSX_SDK_PRODUCT_VERSION = $$system("/usr/bin/xcodebuild -sdk $$QMAKE_MAC_SDK -version ProductVersion 2>/dev/null")
    export(WEBENGINE_OSX_SDK_PRODUCT_VERSION)
    isEmpty(WEBENGINE_OSX_SDK_PRODUCT_VERSION) {
        skipBuild("Could not resolve SDK product version for \'$$QMAKE_MAC_SDK\'.")
        return(false)
    }
    major_version = $$section(WEBENGINE_OSX_SDK_PRODUCT_VERSION, ., 0, 0)
    minor_version = $$section(WEBENGINE_OSX_SDK_PRODUCT_VERSION, ., 1, 1)
    patch_version = $$section(WEBENGINE_OSX_SDK_PRODUCT_VERSION, ., 2, 2)
    isEmpty(patch_version): patch_version = 0

    greaterThan(major_version, $$requested_major):return(true)
    equals(major_version, $$requested_major):greaterThan(minor_version, $$requested_minor):return(true)
    equals(major_version, $$requested_major):equals(minor_version, $$requested_minor):!lessThan(patch_version, $$requested_patch):return(true)

    return(false)
}

# Map to the correct target type for gyp
defineReplace(toGypTargetType) {
  equals(TEMPLATE, "app"):return("executable")
  equals(TEMPLATE, "lib") {
    CONFIG(static): return("static_library")
    return("shared_library")
  }
  return("none")
}

defineReplace(getConfigDir) {
  win32:contains(QMAKE_TARGET.arch, x86_64) {
      CONFIG(release, debug|release):return("Release_x64")
      return("Debug_x64")
  }

  CONFIG(release, debug|release):return("Release")
  return("Debug")
}

defineReplace(getChromiumSrcDir) {
  exists($$QTWEBENGINE_ROOT/.git): git_chromium_src_dir = $$system("git config qtwebengine.chromiumsrcdir")
  # Fall back to the snapshot path if git does not know about chromium sources (i.e. init-repository.py has not been used)
  isEmpty(git_chromium_src_dir): git_chromium_src_dir = "src/3rdparty/chromium"
  return($$git_chromium_src_dir)
}

defineReplace(extractCFlag) {
    CFLAGS = $$QMAKE_CC $$QMAKE_CFLAGS
    OPTION = $$find(CFLAGS, $$1)
    OPTION = $$split(OPTION, =)
    return ($$member(OPTION, 1))
}

defineReplace(findMocables) {
  mocables = $$system("$$system_path(python $$QTWEBENGINE_ROOT/tools/buildscripts/find-mocables $$_PRO_FILE_PWD_ $$1)")
  mocables = $$replace(mocables, $$re_escape($$system_path($${_PRO_FILE_PWD_}/)), '')
  return($$mocables)
}

defineReplace(findIncludedMocFiles) {
  return($$system("$$system_path(python $$QTWEBENGINE_ROOT/tools/buildscripts/find-included-moc-files $$_PRO_FILE_PWD_ $$1)"))
}

defineReplace(mocOutput) {
  out = $$1
  # The order is important, since the output of the second replace would end up accidentaly transformed by the first one
  for(ext, $$list($${QMAKE_EXT_CPP})): \
      out = $$replace(out, ^(.*)($$re_escape($${ext})), $${QMAKE_CPP_MOD_MOC}\\1$${QMAKE_EXT_CPP_MOC})
  for(ext, $$list($${QMAKE_EXT_H})): \
      out = $$replace(out, ^(.*)($$re_escape($${ext})), $${QMAKE_H_MOD_MOC}\\1$${first(QMAKE_EXT_CPP)})
  return($$out)
}

defineReplace(rccOutput) {
  out = $$1
  out = $$replace(out, .qrc, .cpp)
  out = $$join(out, qrc_, qrc_)
  return($$out)
}

defineReplace(rccExternFunc) {
  out = $$1
  out = $$replace(out, .qrc, )
  return($$out)
}

defineReplace(which) {
  out = $$1
  win32 {
    command = $$split(out, " ")
    executable = $$first(command)
    # Return the first match only
    out = $$system("((for /f \"usebackq delims=\" %i in (`where $$executable 2^> NUL`) do @if not defined _endwhich (@echo %i & set _endwhich=true)) & set _endwhich=)")
    isEmpty(out) {
      message($$executable not found)
      out = $$executable
    }
    for(arg, command): !equals(arg, $$executable): out += $$arg
  } else:unix {
    command = $$split(out, " ")
    executable = $$first(command)
    out = $$system("which $$executable 2>/dev/null")
    isEmpty(out) {
      message($$executable not found)
      out = $$executable
    }
    for(arg, command): !equals(arg, $$executable): out += $$arg
  }
  return($$out)
}

defineTest(use?) {
    contains(WEBENGINE_CONFIG, use_$$lower($$1)): return(true)
    return(false)
}

defineReplace(findOrBuildNinja) {
  # If NINJA_PATH env var is set, prefer that.
  # Fallback to locating our own bootstrapped ninja.
  out = $(NINJA_PATH)
  !exists($$out) {
    src_3rd_party_dir = $$absolute_path("$${getChromiumSrcDir()}/../", "$$QTWEBENGINE_ROOT")

    out = $$shadowed($$absolute_path("ninja/ninja", "$$src_3rd_party_dir"))
    win32: out = $${out}.exe

    out = $$system_path($$out)
    # If we did not find ninja, then we bootstrap it.
    !exists($$out) {
      # If we are making a shadow build, copy the ninja sources to the build directory.
      !equals(PWD, $${OUT_PWD}) {
        log("Build directory is different from source directory - copying ninja sources to the build tree...")
        shadow_3rd_party_path = $$system_path($$shadowed($$src_3rd_party_dir))

        !exists($$dirname(out)): mkpath($$dirname(out))
        copy_dir_files {
          system("$$QMAKE_COPY_DIR $$system_quote($$system_path($$absolute_path("ninja", "$$src_3rd_party_dir"))) $$system_quote($$dirname(out))")
        } else {
          system("$$QMAKE_COPY_DIR $$system_quote($$system_path($$absolute_path("ninja", "$$src_3rd_party_dir"))) $$system_quote($$shadow_3rd_party_path)")
        }
      }
      system("cd $$system_quote($$dirname(out)) && python configure.py --bootstrap")
    }
  }
  return($$out)
}

defineTest(skipBuild) {
    skipBuildReason = "$$skipBuildReason $${EOL}$$1"
    export(skipBuildReason)
}