Tools/Scripts/build-webkit - WebKit - Git at Google

 #!/usr/bin/env perl

 # Copyright (C) 2005-2019 Apple Inc. All rights reserved.
 # Copyright (C) 2009 Google Inc. All rights reserved.
 # Copyright (C) 2010 moiji-mobile.com All rights reserved.
 # Copyright (C) 2011 Research In Motion Limited. All rights reserved.
 # Copyright (C) 2013 Nokia Corporation and/or its subsidiary(-ies).
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 #
 # 1.  Redistributions of source code must retain the above copyright
 #     notice, this list of conditions and the following disclaimer.
 # 2.  Redistributions in binary form must reproduce the above copyright
 #     notice, this list of conditions and the following disclaimer in the
 #     documentation and/or other materials provided with the distribution.
 # 3.  Neither the name of Apple Inc. ("Apple") nor the names of
 #     its contributors may be used to endorse or promote products derived
 #     from this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 # DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 # DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 # Build script wrapper for the WebKit Open Source Project.

 use strict;
 use warnings;
 use File::Basename;
 use File::Find;
 use File::Spec;
 use FindBin;
 use Getopt::Long qw(:config pass_through no_auto_abbrev);
 use lib $FindBin::Bin;
 use webkitdirs;
 use List::Util qw(first);
 use webkitperl::FeatureList qw(getFeatureOptionList);
 use POSIX;
 use Text::ParseWords;

 sub writeCongrats();

 checkRequiredSystemConfig();
 setConfiguration();

 if (shouldUseFlatpak()) {
     print "Building flatpak based environment\n";
     my @command = (File::Spec->catfile(sourceDir(), "Tools", "Scripts", "build-webkit"));
     runInFlatpak(@command);
 }

 my $originalWorkingDirectory = getcwd();
 chdirWebKit();

 my $showHelp = 0;
 my $verbose = 0;
 my $clean = 0;
 my $minimal = 0;
 my $installHeaders;
 my $installLibs;
 my $prefixPath;
 my $makeArgs = "";
 my @cmakeArgs;
 my $onlyWebKitProject = 0;
 my $coverageSupport = 0;
 my $shouldRunStaticAnalyzer = 0;
 my $noExperimentalFeatures = 0;
 my $ltoMode = "default";
 my $xcbuild = undef;
 my $startTime = time();
 my $archs32bit = 0;
 my $skipLibraryUpdate = 0;
 my $useCCache = -1;

 my @features = getFeatureOptionList();

 # Additional environment parameters
 push @ARGV, parse_line('\s+', 0, $ENV{'BUILD_WEBKIT_ARGS'}) if ($ENV{'BUILD_WEBKIT_ARGS'});

 # Initialize values from defaults
 foreach (@ARGV) {
     if ($_ eq '--minimal') {
         $minimal = 1;
     } elsif ($_ eq 'ARCHS=i386' or $_ eq 'ARCHS=armv7' or $_ eq 'ARCHS=armv7s') {
         $archs32bit = 1;
     }
 }

 # Feature flags default to undefined, where they will inherit the default value
 # specified by the build system, or to 'off' if --minimal is specified.
 foreach (@features) {
     ${$_->{value}} = ($minimal ? 0 : undef);
 }

 my $programName = basename($0);
 my $usage = <<EOF;
 Usage: $programName [options] [options to pass to build system]
   --help                            Show this help message
   --verbose                         Show verbose build output
   --clean                           Cleanup the build directory
   --generate-project-only           Only generate project files
   --debug                           Compile with Debug configuration
   --release                         Compile with Release configuration
   --sdk=<sdk>                       Use a specific Xcode SDK (iOS and Mac only)
   --ios-device                      Use "iphoneos.internal" SDK if installed, else "iphoneos" SDK (iOS only)
   --device                          DEPRECATED alias of --ios-device
   --ios-simulator                   Use "iphonesimulator.internal" SDK if installed, else "iphonesimulator" SDK (iOS only)
   --simulator                       DEPRECATED alias of --ios-simulator
   --coverage                        Enable code coverage support (Mac only)
   --analyze                         Enable static anaylsis (iOS and Mac only)
   --lto-mode=<mode>                 Set Link Time Optimization mode (full, thin, or none) (LLVM only)
   --[no-]xcbuild                    Force the use of XCBuild or not

   --ftw                             Build the FTW Windows port
   --gtk                             Build the GTK+ port
   --wpe                             Build the WPE port
   --wincairo                        Build using Cairo (rather than CoreGraphics) on Windows
   --playstation                     Build the PlayStation port

   --inspector-frontend              Copy Web Inspector user interface resources to the build directory

   --prefix=<path>                   Set installation prefix to the given path (CMake only, except Windows)
   --makeargs=<arguments>            Optional Makefile flags
   --cmakeargs=<arguments>           One or more optional CMake flags (e.g. --cmakeargs="-DFOO=bar -DCMAKE_PREFIX_PATH=/usr/local")

   --minimal                         No optional features, unless explicitly enabled
   --no-experimental-features        No experimental features, unless explicitly enabled (CMake only)

   --only-webkit                     Build only the WebKit project

   --skip-library-update             Skip the check to see if windows libraries are up to date

   --[no-]use-ccache                 Enable (or disable) CCache, if available

 EOF

 my %options = (
     'help' => \$showHelp,
     'v|verbose' => \$verbose,
     'clean' => \$clean,
     'install-headers=s' => \$installHeaders,
     'install-libs=s' => \$installLibs,
     'prefix=s' => \$prefixPath,
     'makeargs=s' => \$makeArgs,
     'cmakeargs=s' => \@cmakeArgs,
     'minimal' => \$minimal,
     'only-webkit' => \$onlyWebKitProject,
     'coverage' => \$coverageSupport,
     'analyze' => \$shouldRunStaticAnalyzer,
     'no-experimental-features' => \$noExperimentalFeatures,
     'lto-mode=s' => \$ltoMode,
     'xcbuild!' => \$xcbuild,
     'skip-library-update' => \$skipLibraryUpdate,
     'use-ccache!' => \$useCCache,
 );

 # Build usage text and options list from features
 foreach (@features) {
     my $opt = sprintf("%-35s", "  --[no-]$_->{option}");
     $usage .= "$opt $_->{desc}\n";
     $options{"$_->{option}!"} = $_->{value};
 }

 GetOptions(%options);

 if ($showHelp) {
    print STDERR $usage;
    exit 1;
 }

 $ENV{'VERBOSE'} = 1 if $verbose;

 if ($useCCache == 1) {
     $ENV{'WK_USE_CCACHE'} = "YES";
 } elsif ($useCCache == 0) {
     $ENV{'WK_USE_CCACHE'} = "NO";
 }


 my $productDir = productDir();

 # Check that all the project directories are there.
 my @projects = ("Source/JavaScriptCore", "Source/WebCore", "Source/WebKitLegacy");

 # Build WTF as a separate static library on ports which support it.
 splice @projects, 0, 0, "Source/WTF" if isAppleWebKit() or isWinCairo() or isFTW();

 splice @projects, 0, 0, "Source/bmalloc" if isAppleCocoaWebKit();

 # Ports using CMake will check if directories exist in the CMake configuration.
 if (!isCMakeBuild()) {
     for my $dir (@projects) {
         if (! -d $dir) {
             die "Error: No $dir directory found. Please do a fresh checkout.\n";
         }
     }
 }

 if ((isAppleWebKit() || isWinCairo() || isPlayStation() || isFTW()) && !-d "WebKitLibraries") {
     die "Error: No WebKitLibraries directory found. Please do a fresh checkout.\n";
 }

 my @options = ();

 if (isAppleCocoaWebKit()) {
     push @options, XcodeOptions();

     if (not defined $xcbuild) {
         $xcbuild = canUseXCBuild();
     }

     if ($xcbuild) {
         push @options, "-UseNewBuildSystem=YES";
         push @options, "USE_NEW_BUILD_SYSTEM=YES";
     } else {
         push @options, "-UseNewBuildSystem=NO";
     }

     sub option($$)
     {
         my ($feature, $isEnabled) = @_;
         return "" if not defined $isEnabled;
         return $feature . "=" . ($isEnabled ? $feature : "");
     }

     foreach (@features) {
         my $option = option($_->{define}, ${$_->{value}});
         push @options, $option unless $option eq "";
     }

     # ANGLE and libwebrtc must come before WebCore
     splice @projects, 0, 0, ("Source/ThirdParty/ANGLE");
     if (not $archs32bit and ((portName() eq Mac and not architecture() eq "i386") or
         (portName() eq iOS and (architecture() eq "arm64" or architecture() eq "x86_64")))) {
         splice @projects, 0, 0, ("Source/ThirdParty/libwebrtc");
     }

     push @projects, ("Source/WebKit");

     if (!isIOSWebKit()) {
         push @projects, ("Tools/MiniBrowser");

         # WebInspectorUI must come after JavaScriptCore and WebCore but before WebKit and WebKit2
         my $webKitIndex = first { $projects[$_] eq "Source/WebKitLegacy" } 0..$#projects;
         splice(@projects, $webKitIndex, 0, "Source/WebInspectorUI");

         # Copy library and header from WebKitLibraries to a findable place in the product directory.
         my @copyLibrariesArgs = ("perl", "Tools/Scripts/copy-webkitlibraries-to-product-directory", "--wksi",  productDir());
         print(join(" ", @copyLibrariesArgs) . "\n");
         (system(@copyLibrariesArgs) == 0) or die;
     } else {
         my @copyLibrariesArgs = ("perl", "Tools/Scripts/copy-webkitlibraries-to-product-directory", "--sdk", xcodeSDK(), "--wksi");
         push @copyLibrariesArgs, productDir();
         print(join(" ", @copyLibrariesArgs) . "\n");
         (system(@copyLibrariesArgs) == 0) or die;
     }

     if (isAppleMacWebKit()) {
         push @projects, ("Tools/lldb/lldbWebKitTester");
     }

     # Build Tools needed for Apple ports
     push @projects, ("Tools/DumpRenderTree", "Tools/WebKitTestRunner", "Source/ThirdParty/gtest", "Tools/TestWebKitAPI");

 } elsif (isWinCairo() && !$skipLibraryUpdate) {
     (system("python Tools/Scripts/update-webkit-wincairo-libs.py") == 0) or die;
 } elsif (isAppleWinWebKit() && !$skipLibraryUpdate) {
     # Copy WebKitSupportLibrary to the correct location in WebKitLibraries so it can be found.
     # Will fail if WebKitSupportLibrary.zip is not in source root.
     (system("perl Tools/Scripts/update-webkit-support-libs") == 0) or die;
     (system("perl Tools/Scripts/update-webkit-auxiliary-libs") == 0) or die;
     setupAppleWinEnv()
 }

 # If asked to build just the WebKit project, overwrite the projects
 # list after all of the port specific tweaks have been made to
 # build options, etc.
 @projects = ("Source/WebKitLegacy") if $onlyWebKitProject;

 my $result = 0;

 if (isInspectorFrontend()) {
     die "The --inspector-frontend option is not supported for CMake-based builds." if isCMakeBuild();
     @projects = ("Source/WebInspectorUI");
 }

 if (isCMakeBuild() && !isAnyWindows()) {
     if (!canUseNinja() || defined($ENV{NUMBER_OF_PROCESSORS})) {
         # If the user environment is not setting a specific number of process,
         # then don't pass the number of jobs to Ninja. Because Ninja will
         # automatically determine the number of jobs to run in parallel.
         $makeArgs .= ($makeArgs ? " " : "") . "-j" . numberOfCPUs() if $makeArgs !~ /-j\s*\d+/;
     }

     my $maxCPULoad = maxCPULoad() if $makeArgs !~ /-l\s*\d+\.?\d*/;
     $makeArgs .= " -l" . maxCPULoad() if defined $maxCPULoad;

     # We remove CMakeCache to avoid the bots reusing cached flags when
     # we enable new features. This forces a reconfiguration.
     my @featureArgs = cmakeArgsFromFeatures(@features, !$noExperimentalFeatures);
     removeCMakeCache(@featureArgs);

     buildCMakeProjectOrExit($clean, $prefixPath, $makeArgs, @featureArgs, @cmakeArgs);
 }

 my $baseProductDir = baseProductDir();
 if (isAppleWinWebKit() || isWinCairo() || isPlayStation() || isFTW()) {
     my @featureArgs = cmakeArgsFromFeatures(@features, !$noExperimentalFeatures);
     removeCMakeCache(@featureArgs);

     chdirWebKit();
     if (exitStatus(generateBuildSystemFromCMakeProject($prefixPath, @featureArgs, @cmakeArgs))) {
         die "Run Visual Studio 2017 installation vcvars.bat before build-webkit when using ninja";
     }

     exit 0 if isGenerateProjectOnly();

     chdirWebKit();
     if (canUseNinja()) {
         chdir File::Spec->catdir($baseProductDir, configuration());
         $result = system("ninja");
     } else {
         $result = buildVisualStudioProject(File::Spec->catfile($baseProductDir, configuration(), "WebKit.sln"), $clean);
     }
     if (exitStatus($result)) {
         my $scriptDir = relativeScriptsDir();
         if (isAppleWinWebKit() || isWinCairo() || isFTW()) {
             print "\n\n===== BUILD FAILED ======\n\n";
             print "Please ensure you have run $scriptDir/update-webkit to install dependencies.\n\n";
             print "You can view build errors by checking the BuildLog.htm files located at:\n$baseProductDir/obj/<project>/<config>.\n";
         }
         exit exitStatus($result);
     }
 } elsif (isAppleCocoaWebKit() && !isCMakeBuild()) {
     exit 0 if isGenerateProjectOnly();

     # Build, and abort if the build fails.
     for my $dir (@projects) {
         chdir $dir or die;
         $result = 0;

         my $project = basename($dir);

         my @local_options = @options;
         push @local_options, XcodeCoverageSupportOptions() if $coverageSupport;
         push @local_options, XcodeStaticAnalyzerOption() if $shouldRunStaticAnalyzer;
         push @local_options, "WK_LTO_MODE=$ltoMode" if ($ltoMode ne "default");
         my $projectPath = $project =~ /gtest/ ? "xcode/gtest" : $project;
         $result = buildXCodeProject($projectPath, $clean, @local_options, @ARGV);

         # Various build* calls above may change the CWD.
         chdirWebKit();

         if (exitStatus($result)) {
             exit exitStatus($result);
         }
     }

     # Build ImageDiff for host
     my @command = File::Spec->catfile(getcwd(), "/Tools/Scripts/build-imagediff");
     chdirWebKit();
     if (!-e $command[0]) {
         die "build-imagediff script not found";
     }

     if ($clean) {
         push @command, " --clean";
     }
     push @command, argumentsForConfiguration();
     push @command, @ARGV;
     @command = extractNonMacOSHostConfiguration(\@command);
     $result = system(@command);
     if (exitStatus($result)) {
         exit exitStatus($result);
     }
 }

 # Don't report the "WebKit is now built" message after a clean operation.
 exit if $clean;

 # Don't report congrats message if build was interrupted by the user.
 exit if ($result & 127) == SIGINT;

 # Explicitly chdir back to where exit will take us anyway, since the following "launcher"
 # message is relative to that directory.
 chdir $originalWorkingDirectory;

 # Write out congratulations message.
 writeCongrats();

 exit 0;

 sub writeCongrats()
 {
     my $launcherPath = launcherPath();
     my $launcherName = launcherName();
     my $endTime = time();
     my $buildTime = formatBuildTime($endTime - $startTime);

     print "\n";
     print "====================================================================\n";
     print " WebKit is now built ($buildTime). \n";
     if ($launcherPath && $launcherName) {
         print " To run $launcherName with this newly-built code, use the\n";
         print " \"$launcherPath\" script.\n";
     }
     print "====================================================================\n";
 }
	#!/usr/bin/env perl

	# Copyright (C) 2005-2019 Apple Inc. All rights reserved.
	# Copyright (C) 2009 Google Inc. All rights reserved.
	# Copyright (C) 2010 moiji-mobile.com All rights reserved.
	# Copyright (C) 2011 Research In Motion Limited. All rights reserved.
	# Copyright (C) 2013 Nokia Corporation and/or its subsidiary(-ies).
	#
	# Redistribution and use in source and binary forms, with or without
	# modification, are permitted provided that the following conditions
	# are met:
	#
	# 1. Redistributions of source code must retain the above copyright
	# notice, this list of conditions and the following disclaimer.
	# 2. Redistributions in binary form must reproduce the above copyright
	# notice, this list of conditions and the following disclaimer in the
	# documentation and/or other materials provided with the distribution.
	# 3. Neither the name of Apple Inc. ("Apple") nor the names of
	# its contributors may be used to endorse or promote products derived
	# from this software without specific prior written permission.
	#
	# THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
	# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	# DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
	# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	# Build script wrapper for the WebKit Open Source Project.

	use strict;
	use warnings;
	use File::Basename;
	use File::Find;
	use File::Spec;
	use FindBin;
	use Getopt::Long qw(:config pass_through no_auto_abbrev);
	use lib $FindBin::Bin;
	use webkitdirs;
	use List::Util qw(first);
	use webkitperl::FeatureList qw(getFeatureOptionList);
	use POSIX;
	use Text::ParseWords;

	sub writeCongrats();

	checkRequiredSystemConfig();
	setConfiguration();

	if (shouldUseFlatpak()) {
	print "Building flatpak based environment\n";
	my @command = (File::Spec->catfile(sourceDir(), "Tools", "Scripts", "build-webkit"));
	runInFlatpak(@command);
	}

	my $originalWorkingDirectory = getcwd();
	chdirWebKit();

	my $showHelp = 0;
	my $verbose = 0;
	my $clean = 0;
	my $minimal = 0;
	my $installHeaders;
	my $installLibs;
	my $prefixPath;
	my $makeArgs = "";
	my @cmakeArgs;
	my $onlyWebKitProject = 0;
	my $coverageSupport = 0;
	my $shouldRunStaticAnalyzer = 0;
	my $noExperimentalFeatures = 0;
	my $ltoMode = "default";
	my $xcbuild = undef;
	my $startTime = time();
	my $archs32bit = 0;
	my $skipLibraryUpdate = 0;
	my $useCCache = -1;

	my @features = getFeatureOptionList();

	# Additional environment parameters
	push @ARGV, parse_line('\s+', 0, $ENV{'BUILD_WEBKIT_ARGS'}) if ($ENV{'BUILD_WEBKIT_ARGS'});

	# Initialize values from defaults
	foreach (@ARGV) {
	if ($_ eq '--minimal') {
	$minimal = 1;
	} elsif ($_ eq 'ARCHS=i386' or $_ eq 'ARCHS=armv7' or $_ eq 'ARCHS=armv7s') {
	$archs32bit = 1;
	}
	}

	# Feature flags default to undefined, where they will inherit the default value
	# specified by the build system, or to 'off' if --minimal is specified.
	foreach (@features) {
	${$_->{value}} = ($minimal ? 0 : undef);
	}

	my $programName = basename($0);
	my $usage = <<EOF;
	Usage: $programName [options] [options to pass to build system]
	--help Show this help message
	--verbose Show verbose build output
	--clean Cleanup the build directory
	--generate-project-only Only generate project files
	--debug Compile with Debug configuration
	--release Compile with Release configuration
	--sdk=<sdk> Use a specific Xcode SDK (iOS and Mac only)
	--ios-device Use "iphoneos.internal" SDK if installed, else "iphoneos" SDK (iOS only)
	--device DEPRECATED alias of --ios-device
	--ios-simulator Use "iphonesimulator.internal" SDK if installed, else "iphonesimulator" SDK (iOS only)
	--simulator DEPRECATED alias of --ios-simulator
	--coverage Enable code coverage support (Mac only)
	--analyze Enable static anaylsis (iOS and Mac only)
	--lto-mode=<mode> Set Link Time Optimization mode (full, thin, or none) (LLVM only)
	--[no-]xcbuild Force the use of XCBuild or not

	--ftw Build the FTW Windows port
	--gtk Build the GTK+ port
	--wpe Build the WPE port
	--wincairo Build using Cairo (rather than CoreGraphics) on Windows
	--playstation Build the PlayStation port

	--inspector-frontend Copy Web Inspector user interface resources to the build directory

	--prefix=<path> Set installation prefix to the given path (CMake only, except Windows)
	--makeargs=<arguments> Optional Makefile flags
	--cmakeargs=<arguments> One or more optional CMake flags (e.g. --cmakeargs="-DFOO=bar -DCMAKE_PREFIX_PATH=/usr/local")

	--minimal No optional features, unless explicitly enabled
	--no-experimental-features No experimental features, unless explicitly enabled (CMake only)

	--only-webkit Build only the WebKit project

	--skip-library-update Skip the check to see if windows libraries are up to date

	--[no-]use-ccache Enable (or disable) CCache, if available

	EOF

	my %options = (
	'help' => \$showHelp,
	'v\|verbose' => \$verbose,
	'clean' => \$clean,
	'install-headers=s' => \$installHeaders,
	'install-libs=s' => \$installLibs,
	'prefix=s' => \$prefixPath,
	'makeargs=s' => \$makeArgs,
	'cmakeargs=s' => \@cmakeArgs,
	'minimal' => \$minimal,
	'only-webkit' => \$onlyWebKitProject,
	'coverage' => \$coverageSupport,
	'analyze' => \$shouldRunStaticAnalyzer,
	'no-experimental-features' => \$noExperimentalFeatures,
	'lto-mode=s' => \$ltoMode,
	'xcbuild!' => \$xcbuild,
	'skip-library-update' => \$skipLibraryUpdate,
	'use-ccache!' => \$useCCache,
	);

	# Build usage text and options list from features
	foreach (@features) {
	my $opt = sprintf("%-35s", " --[no-]$_->{option}");
	$usage .= "$opt $_->{desc}\n";
	$options{"$_->{option}!"} = $_->{value};
	}

	GetOptions(%options);

	if ($showHelp) {
	print STDERR $usage;
	exit 1;
	}

	$ENV{'VERBOSE'} = 1 if $verbose;

	if ($useCCache == 1) {
	$ENV{'WK_USE_CCACHE'} = "YES";
	} elsif ($useCCache == 0) {
	$ENV{'WK_USE_CCACHE'} = "NO";
	}


	my $productDir = productDir();

	# Check that all the project directories are there.
	my @projects = ("Source/JavaScriptCore", "Source/WebCore", "Source/WebKitLegacy");

	# Build WTF as a separate static library on ports which support it.
	splice @projects, 0, 0, "Source/WTF" if isAppleWebKit() or isWinCairo() or isFTW();

	splice @projects, 0, 0, "Source/bmalloc" if isAppleCocoaWebKit();

	# Ports using CMake will check if directories exist in the CMake configuration.
	if (!isCMakeBuild()) {
	for my $dir (@projects) {
	if (! -d $dir) {
	die "Error: No $dir directory found. Please do a fresh checkout.\n";
	}
	}
	}

	if ((isAppleWebKit() \|\| isWinCairo() \|\| isPlayStation() \|\| isFTW()) && !-d "WebKitLibraries") {
	die "Error: No WebKitLibraries directory found. Please do a fresh checkout.\n";
	}

	my @options = ();

	if (isAppleCocoaWebKit()) {
	push @options, XcodeOptions();

	if (not defined $xcbuild) {
	$xcbuild = canUseXCBuild();
	}

	if ($xcbuild) {
	push @options, "-UseNewBuildSystem=YES";
	push @options, "USE_NEW_BUILD_SYSTEM=YES";
	} else {
	push @options, "-UseNewBuildSystem=NO";
	}

	sub option($$)
	{
	my ($feature, $isEnabled) = @_;
	return "" if not defined $isEnabled;
	return $feature . "=" . ($isEnabled ? $feature : "");
	}

	foreach (@features) {
	my $option = option($_->{define}, ${$_->{value}});
	push @options, $option unless $option eq "";
	}

	# ANGLE and libwebrtc must come before WebCore
	splice @projects, 0, 0, ("Source/ThirdParty/ANGLE");
	if (not $archs32bit and ((portName() eq Mac and not architecture() eq "i386") or
	(portName() eq iOS and (architecture() eq "arm64" or architecture() eq "x86_64")))) {
	splice @projects, 0, 0, ("Source/ThirdParty/libwebrtc");
	}

	push @projects, ("Source/WebKit");

	if (!isIOSWebKit()) {
	push @projects, ("Tools/MiniBrowser");

	# WebInspectorUI must come after JavaScriptCore and WebCore but before WebKit and WebKit2
	my $webKitIndex = first { $projects[$_] eq "Source/WebKitLegacy" } 0..$#projects;
	splice(@projects, $webKitIndex, 0, "Source/WebInspectorUI");

	# Copy library and header from WebKitLibraries to a findable place in the product directory.
	my @copyLibrariesArgs = ("perl", "Tools/Scripts/copy-webkitlibraries-to-product-directory", "--wksi", productDir());
	print(join(" ", @copyLibrariesArgs) . "\n");
	(system(@copyLibrariesArgs) == 0) or die;
	} else {
	my @copyLibrariesArgs = ("perl", "Tools/Scripts/copy-webkitlibraries-to-product-directory", "--sdk", xcodeSDK(), "--wksi");
	push @copyLibrariesArgs, productDir();
	print(join(" ", @copyLibrariesArgs) . "\n");
	(system(@copyLibrariesArgs) == 0) or die;
	}

	if (isAppleMacWebKit()) {
	push @projects, ("Tools/lldb/lldbWebKitTester");
	}

	# Build Tools needed for Apple ports
	push @projects, ("Tools/DumpRenderTree", "Tools/WebKitTestRunner", "Source/ThirdParty/gtest", "Tools/TestWebKitAPI");

	} elsif (isWinCairo() && !$skipLibraryUpdate) {
	(system("python Tools/Scripts/update-webkit-wincairo-libs.py") == 0) or die;
	} elsif (isAppleWinWebKit() && !$skipLibraryUpdate) {
	# Copy WebKitSupportLibrary to the correct location in WebKitLibraries so it can be found.
	# Will fail if WebKitSupportLibrary.zip is not in source root.
	(system("perl Tools/Scripts/update-webkit-support-libs") == 0) or die;
	(system("perl Tools/Scripts/update-webkit-auxiliary-libs") == 0) or die;
	setupAppleWinEnv()
	}

	# If asked to build just the WebKit project, overwrite the projects
	# list after all of the port specific tweaks have been made to
	# build options, etc.
	@projects = ("Source/WebKitLegacy") if $onlyWebKitProject;

	my $result = 0;

	if (isInspectorFrontend()) {
	die "The --inspector-frontend option is not supported for CMake-based builds." if isCMakeBuild();
	@projects = ("Source/WebInspectorUI");
	}

	if (isCMakeBuild() && !isAnyWindows()) {
	if (!canUseNinja() \|\| defined($ENV{NUMBER_OF_PROCESSORS})) {
	# If the user environment is not setting a specific number of process,
	# then don't pass the number of jobs to Ninja. Because Ninja will
	# automatically determine the number of jobs to run in parallel.
	$makeArgs .= ($makeArgs ? " " : "") . "-j" . numberOfCPUs() if $makeArgs !~ /-j\s*\d+/;
	}

	my $maxCPULoad = maxCPULoad() if $makeArgs !~ /-l\s\d+\.?\d/;
	$makeArgs .= " -l" . maxCPULoad() if defined $maxCPULoad;

	# We remove CMakeCache to avoid the bots reusing cached flags when
	# we enable new features. This forces a reconfiguration.
	my @featureArgs = cmakeArgsFromFeatures(@features, !$noExperimentalFeatures);
	removeCMakeCache(@featureArgs);

	buildCMakeProjectOrExit($clean, $prefixPath, $makeArgs, @featureArgs, @cmakeArgs);
	}

	my $baseProductDir = baseProductDir();
	if (isAppleWinWebKit() \|\| isWinCairo() \|\| isPlayStation() \|\| isFTW()) {
	my @featureArgs = cmakeArgsFromFeatures(@features, !$noExperimentalFeatures);
	removeCMakeCache(@featureArgs);

	chdirWebKit();
	if (exitStatus(generateBuildSystemFromCMakeProject($prefixPath, @featureArgs, @cmakeArgs))) {
	die "Run Visual Studio 2017 installation vcvars.bat before build-webkit when using ninja";
	}

	exit 0 if isGenerateProjectOnly();

	chdirWebKit();
	if (canUseNinja()) {
	chdir File::Spec->catdir($baseProductDir, configuration());
	$result = system("ninja");
	} else {
	$result = buildVisualStudioProject(File::Spec->catfile($baseProductDir, configuration(), "WebKit.sln"), $clean);
	}
	if (exitStatus($result)) {
	my $scriptDir = relativeScriptsDir();
	if (isAppleWinWebKit() \|\| isWinCairo() \|\| isFTW()) {
	print "\n\n===== BUILD FAILED ======\n\n";
	print "Please ensure you have run $scriptDir/update-webkit to install dependencies.\n\n";
	print "You can view build errors by checking the BuildLog.htm files located at:\n$baseProductDir/obj/<project>/<config>.\n";
	}
	exit exitStatus($result);
	}
	} elsif (isAppleCocoaWebKit() && !isCMakeBuild()) {
	exit 0 if isGenerateProjectOnly();

	# Build, and abort if the build fails.
	for my $dir (@projects) {
	chdir $dir or die;
	$result = 0;

	my $project = basename($dir);

	my @local_options = @options;
	push @local_options, XcodeCoverageSupportOptions() if $coverageSupport;
	push @local_options, XcodeStaticAnalyzerOption() if $shouldRunStaticAnalyzer;
	push @local_options, "WK_LTO_MODE=$ltoMode" if ($ltoMode ne "default");
	my $projectPath = $project =~ /gtest/ ? "xcode/gtest" : $project;
	$result = buildXCodeProject($projectPath, $clean, @local_options, @ARGV);

	# Various build* calls above may change the CWD.
	chdirWebKit();

	if (exitStatus($result)) {
	exit exitStatus($result);
	}
	}

	# Build ImageDiff for host
	my @command = File::Spec->catfile(getcwd(), "/Tools/Scripts/build-imagediff");
	chdirWebKit();
	if (!-e $command[0]) {
	die "build-imagediff script not found";
	}

	if ($clean) {
	push @command, " --clean";
	}
	push @command, argumentsForConfiguration();
	push @command, @ARGV;
	@command = extractNonMacOSHostConfiguration(\@command);
	$result = system(@command);
	if (exitStatus($result)) {
	exit exitStatus($result);
	}
	}

	# Don't report the "WebKit is now built" message after a clean operation.
	exit if $clean;

	# Don't report congrats message if build was interrupted by the user.
	exit if ($result & 127) == SIGINT;

	# Explicitly chdir back to where exit will take us anyway, since the following "launcher"
	# message is relative to that directory.
	chdir $originalWorkingDirectory;

	# Write out congratulations message.
	writeCongrats();

	exit 0;

	sub writeCongrats()
	{
	my $launcherPath = launcherPath();
	my $launcherName = launcherName();
	my $endTime = time();
	my $buildTime = formatBuildTime($endTime - $startTime);

	print "\n";
	print "====================================================================\n";
	print " WebKit is now built ($buildTime). \n";
	if ($launcherPath && $launcherName) {
	print " To run $launcherName with this newly-built code, use the\n";
	print " \"$launcherPath\" script.\n";
	}
	print "====================================================================\n";
	}