Title: [265602] trunk
Revision
265602
Author
krol...@apple.com
Date
2020-08-12 23:09:30 -0700 (Wed, 12 Aug 2020)

Log Message

Remove the need for defining USE_NEW_BUILD_SYSTEM
https://bugs.webkit.org/show_bug.cgi?id=215439

Reviewed by Darin Adler.

When building WebKit for XCBuild, we currently require that the
external build system (such as the Makefile, build-webkit, etc.)
defines the USE_NEW_BUILD_SYSTEM=YES build setting. This build setting
controls parts of our build instructions that are sensitive to when
XCBuild or the Legacy build system are being used. Notably, we need to
know when to use our custom “copy and modify” scripts with copying
certain header files (used with the Legacy build system) vs. using the
enhanced Copy Headers build phase that’s enabled with
APPLY_RULES_IN_COPY_HEADERS=YES (introduced with and used by XCBuild).
The choice of which method to copy headers is used is controlled by
USE_NEW_BUILD_SYSTEM.

There is no built-in build setting that we can probe to help us
determine which approach to take when copying and modifying headers,
which is why we need to define USE_NEW_BUILD_SYSTEM ourselves. But it
turns out that we can *detect* which build system is being used by
taking advantage of a subtle difference between the two systems. As
noted in:

    https://developer.apple.com/documentation/xcode-release-notes/build-system-release-notes-for-xcode-10

    “When an .xcconfig file contains multiple assignments of the same
     build setting, later assignments using $(inherited) or
     $(<setting_name>) will inherit from earlier assignments in the
     .xcconfig. The legacy build system caused every use of
     $(inherited) or $(<setting_name>) skip any other values defined
     within the .xcconfig.”

This difference can be exploited as follows:

    WK_WHICH_BUILD_SYSTEM = not_
    WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
    WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
    WK_USE_NEW_BUILD_SYSTEM_legacy = NO
    WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES

We can then use WK_USE_NEW_BUILD_SYSTEM where we used to use the
externally-defined USE_NEW_BUILD_SYSTEM.

.:

* Makefile.shared:

Source/_javascript_Core:

* Configurations/Base.xcconfig:
* Configurations/_javascript_Core.xcconfig:
* _javascript_Core.xcodeproj/project.pbxproj:

Source/ThirdParty/ANGLE:

* ANGLE.xcodeproj/project.pbxproj:
* Configurations/ANGLE-dynamic.xcconfig:
* Configurations/ANGLE-static.xcconfig:
* Configurations/Base.xcconfig:

Source/WebKit:

No new tests -- no new or changed functionality.

* Configurations/Base.xcconfig:
* Configurations/WebKit.xcconfig:
* WebKit.xcodeproj/project.pbxproj:

Source/WebKitLegacy:

* WebKitLegacy.xcodeproj/project.pbxproj:

Source/WebKitLegacy/mac:

* Configurations/Base.xcconfig:
* Configurations/WebKitLegacy.xcconfig:

Tools:

* Scripts/build-webkit:

Modified Paths

Diff

Modified: trunk/ChangeLog (265601 => 265602)


--- trunk/ChangeLog	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/ChangeLog	2020-08-13 06:09:30 UTC (rev 265602)
@@ -1,3 +1,51 @@
+2020-08-12  Keith Rollin  <krol...@apple.com>
+
+        Remove the need for defining USE_NEW_BUILD_SYSTEM
+        https://bugs.webkit.org/show_bug.cgi?id=215439
+
+        Reviewed by Darin Adler.
+
+        When building WebKit for XCBuild, we currently require that the
+        external build system (such as the Makefile, build-webkit, etc.)
+        defines the USE_NEW_BUILD_SYSTEM=YES build setting. This build setting
+        controls parts of our build instructions that are sensitive to when
+        XCBuild or the Legacy build system are being used. Notably, we need to
+        know when to use our custom “copy and modify” scripts with copying
+        certain header files (used with the Legacy build system) vs. using the
+        enhanced Copy Headers build phase that’s enabled with
+        APPLY_RULES_IN_COPY_HEADERS=YES (introduced with and used by XCBuild).
+        The choice of which method to copy headers is used is controlled by
+        USE_NEW_BUILD_SYSTEM.
+
+        There is no built-in build setting that we can probe to help us
+        determine which approach to take when copying and modifying headers,
+        which is why we need to define USE_NEW_BUILD_SYSTEM ourselves. But it
+        turns out that we can *detect* which build system is being used by
+        taking advantage of a subtle difference between the two systems. As
+        noted in:
+
+            https://developer.apple.com/documentation/xcode-release-notes/build-system-release-notes-for-xcode-10
+
+            “When an .xcconfig file contains multiple assignments of the same
+             build setting, later assignments using $(inherited) or
+             $(<setting_name>) will inherit from earlier assignments in the
+             .xcconfig. The legacy build system caused every use of
+             $(inherited) or $(<setting_name>) skip any other values defined
+             within the .xcconfig.”
+
+        This difference can be exploited as follows:
+
+            WK_WHICH_BUILD_SYSTEM = not_
+            WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
+            WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
+            WK_USE_NEW_BUILD_SYSTEM_legacy = NO
+            WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES
+
+        We can then use WK_USE_NEW_BUILD_SYSTEM where we used to use the
+        externally-defined USE_NEW_BUILD_SYSTEM.
+
+        * Makefile.shared:
+
 2020-08-11  Philippe Normand  <pnorm...@igalia.com>
 
         [GStreamer] gst-full standalone library support

Modified: trunk/Makefile.shared (265601 => 265602)


--- trunk/Makefile.shared	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Makefile.shared	2020-08-13 06:09:30 UTC (rev 265602)
@@ -42,12 +42,9 @@
 	ifeq ($(CAN_USE_XCBUILD),1)
 		# Temporarily disable default use of XCBuild until issues with it are ironed out.
 		#XCODE_OPTIONS += -UseNewBuildSystem=YES
-		#XCODE_OPTIONS += USE_NEW_BUILD_SYSTEM=YES
 		XCODE_OPTIONS += -UseNewBuildSystem=NO
-		XCODE_OPTIONS += USE_NEW_BUILD_SYSTEM=NO
 	else
 		XCODE_OPTIONS += -UseNewBuildSystem=NO
-		XCODE_OPTIONS += USE_NEW_BUILD_SYSTEM=NO
 	endif
 endif
 

Modified: trunk/Source/_javascript_Core/ChangeLog (265601 => 265602)


--- trunk/Source/_javascript_Core/ChangeLog	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/_javascript_Core/ChangeLog	2020-08-13 06:09:30 UTC (rev 265602)
@@ -1,3 +1,53 @@
+2020-08-12  Keith Rollin  <krol...@apple.com>
+
+        Remove the need for defining USE_NEW_BUILD_SYSTEM
+        https://bugs.webkit.org/show_bug.cgi?id=215439
+
+        Reviewed by Darin Adler.
+
+        When building WebKit for XCBuild, we currently require that the
+        external build system (such as the Makefile, build-webkit, etc.)
+        defines the USE_NEW_BUILD_SYSTEM=YES build setting. This build setting
+        controls parts of our build instructions that are sensitive to when
+        XCBuild or the Legacy build system are being used. Notably, we need to
+        know when to use our custom “copy and modify” scripts with copying
+        certain header files (used with the Legacy build system) vs. using the
+        enhanced Copy Headers build phase that’s enabled with
+        APPLY_RULES_IN_COPY_HEADERS=YES (introduced with and used by XCBuild).
+        The choice of which method to copy headers is used is controlled by
+        USE_NEW_BUILD_SYSTEM.
+
+        There is no built-in build setting that we can probe to help us
+        determine which approach to take when copying and modifying headers,
+        which is why we need to define USE_NEW_BUILD_SYSTEM ourselves. But it
+        turns out that we can *detect* which build system is being used by
+        taking advantage of a subtle difference between the two systems. As
+        noted in:
+
+            https://developer.apple.com/documentation/xcode-release-notes/build-system-release-notes-for-xcode-10
+
+            “When an .xcconfig file contains multiple assignments of the same
+             build setting, later assignments using $(inherited) or
+             $(<setting_name>) will inherit from earlier assignments in the
+             .xcconfig. The legacy build system caused every use of
+             $(inherited) or $(<setting_name>) skip any other values defined
+             within the .xcconfig.”
+
+        This difference can be exploited as follows:
+
+            WK_WHICH_BUILD_SYSTEM = not_
+            WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
+            WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
+            WK_USE_NEW_BUILD_SYSTEM_legacy = NO
+            WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES
+
+        We can then use WK_USE_NEW_BUILD_SYSTEM where we used to use the
+        externally-defined USE_NEW_BUILD_SYSTEM.
+
+        * Configurations/Base.xcconfig:
+        * Configurations/_javascript_Core.xcconfig:
+        * _javascript_Core.xcodeproj/project.pbxproj:
+
 2020-08-12  Saam Barati  <sbar...@apple.com>
 
         Inline cache Replace and Setters on PureForwardingProxy

Modified: trunk/Source/_javascript_Core/Configurations/Base.xcconfig (265601 => 265602)


--- trunk/Source/_javascript_Core/Configurations/Base.xcconfig	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/_javascript_Core/Configurations/Base.xcconfig	2020-08-13 06:09:30 UTC (rev 265602)
@@ -215,3 +215,11 @@
 WK_USER_LTO_MODE_none = NO;
 WK_USER_LTO_MODE_ = $(WK_DEFAULT_LTO_MODE);
 WK_DEFAULT_LTO_MODE = $(WK_USER_LTO_MODE_thin);
+
+// Use a difference in the way the Legacy build sytem and XCBuild interpret
+// xcconfig file to determine which is being used.
+WK_WHICH_BUILD_SYSTEM = not_
+WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
+WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
+WK_USE_NEW_BUILD_SYSTEM_legacy = NO
+WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES

Modified: trunk/Source/_javascript_Core/Configurations/_javascript_Core.xcconfig (265601 => 265602)


--- trunk/Source/_javascript_Core/Configurations/_javascript_Core.xcconfig	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/_javascript_Core/Configurations/_javascript_Core.xcconfig	2020-08-13 06:09:30 UTC (rev 265602)
@@ -51,9 +51,6 @@
 PRODUCT_BUNDLE_IDENTIFIER = com.apple.$(PRODUCT_NAME:rfc1034identifier);
 
 INSTALLHDRS_SCRIPT_PHASE = YES;
-APPLY_RULES_IN_COPY_HEADERS = $(WK_APPLY_RULES_IN_COPY_HEADERS_$(USE_NEW_BUILD_SYSTEM));
-WK_APPLY_RULES_IN_COPY_HEADERS_ = NO;
-WK_APPLY_RULES_IN_COPY_HEADERS_NO = NO;
-WK_APPLY_RULES_IN_COPY_HEADERS_YES = YES;
+APPLY_RULES_IN_COPY_HEADERS = $(WK_USE_NEW_BUILD_SYSTEM);
 
 EXCLUDED_SOURCE_FILE_NAMES[sdk=iphone*] = framework.sb;

Modified: trunk/Source/_javascript_Core/_javascript_Core.xcodeproj/project.pbxproj (265601 => 265602)


--- trunk/Source/_javascript_Core/_javascript_Core.xcodeproj/project.pbxproj	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/_javascript_Core/_javascript_Core.xcodeproj/project.pbxproj	2020-08-13 06:09:30 UTC (rev 265602)
@@ -10924,7 +10924,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nexec ${SRCROOT}/postprocess-headers.sh\n";
+			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${WK_USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nexec ${SRCROOT}/postprocess-headers.sh\n";
 		};
 		374F95C9205F9975002BF68F /* Make libWTF.a Symbolic Link */ = {
 			isa = PBXShellScriptBuildPhase;

Modified: trunk/Source/ThirdParty/ANGLE/ANGLE.xcodeproj/project.pbxproj (265601 => 265602)


--- trunk/Source/ThirdParty/ANGLE/ANGLE.xcodeproj/project.pbxproj	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/ThirdParty/ANGLE/ANGLE.xcodeproj/project.pbxproj	2020-08-13 06:09:30 UTC (rev 265602)
@@ -4289,7 +4289,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nexec \"$SRCROOT/adjust-angle-include-paths.sh\"\n";
+			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${WK_USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nexec \"$SRCROOT/adjust-angle-include-paths.sh\"\n";
 		};
 /* End PBXShellScriptBuildPhase section */
 

Modified: trunk/Source/ThirdParty/ANGLE/ChangeLog (265601 => 265602)


--- trunk/Source/ThirdParty/ANGLE/ChangeLog	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/ThirdParty/ANGLE/ChangeLog	2020-08-13 06:09:30 UTC (rev 265602)
@@ -1,3 +1,54 @@
+2020-08-12  Keith Rollin  <krol...@apple.com>
+
+        Remove the need for defining USE_NEW_BUILD_SYSTEM
+        https://bugs.webkit.org/show_bug.cgi?id=215439
+
+        Reviewed by Darin Adler.
+
+        When building WebKit for XCBuild, we currently require that the
+        external build system (such as the Makefile, build-webkit, etc.)
+        defines the USE_NEW_BUILD_SYSTEM=YES build setting. This build setting
+        controls parts of our build instructions that are sensitive to when
+        XCBuild or the Legacy build system are being used. Notably, we need to
+        know when to use our custom “copy and modify” scripts with copying
+        certain header files (used with the Legacy build system) vs. using the
+        enhanced Copy Headers build phase that’s enabled with
+        APPLY_RULES_IN_COPY_HEADERS=YES (introduced with and used by XCBuild).
+        The choice of which method to copy headers is used is controlled by
+        USE_NEW_BUILD_SYSTEM.
+
+        There is no built-in build setting that we can probe to help us
+        determine which approach to take when copying and modifying headers,
+        which is why we need to define USE_NEW_BUILD_SYSTEM ourselves. But it
+        turns out that we can *detect* which build system is being used by
+        taking advantage of a subtle difference between the two systems. As
+        noted in:
+
+            https://developer.apple.com/documentation/xcode-release-notes/build-system-release-notes-for-xcode-10
+
+            “When an .xcconfig file contains multiple assignments of the same
+             build setting, later assignments using $(inherited) or
+             $(<setting_name>) will inherit from earlier assignments in the
+             .xcconfig. The legacy build system caused every use of
+             $(inherited) or $(<setting_name>) skip any other values defined
+             within the .xcconfig.”
+
+        This difference can be exploited as follows:
+
+            WK_WHICH_BUILD_SYSTEM = not_
+            WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
+            WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
+            WK_USE_NEW_BUILD_SYSTEM_legacy = NO
+            WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES
+
+        We can then use WK_USE_NEW_BUILD_SYSTEM where we used to use the
+        externally-defined USE_NEW_BUILD_SYSTEM.
+
+        * ANGLE.xcodeproj/project.pbxproj:
+        * Configurations/ANGLE-dynamic.xcconfig:
+        * Configurations/ANGLE-static.xcconfig:
+        * Configurations/Base.xcconfig:
+
 2020-08-07  Dean Jackson  <d...@apple.com>
 
         ANGLE: No need to check for Catalyst in the iOS build

Modified: trunk/Source/ThirdParty/ANGLE/Configurations/ANGLE-dynamic.xcconfig (265601 => 265602)


--- trunk/Source/ThirdParty/ANGLE/Configurations/ANGLE-dynamic.xcconfig	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/ThirdParty/ANGLE/Configurations/ANGLE-dynamic.xcconfig	2020-08-13 06:09:30 UTC (rev 265602)
@@ -40,4 +40,4 @@
 
 INSTALLHDRS_SCRIPT_PHASE = YES;
 USE_HEADERMAP = NO;
-APPLY_RULES_IN_COPY_HEADERS = $(USE_NEW_BUILD_SYSTEM);
+APPLY_RULES_IN_COPY_HEADERS = $(WK_USE_NEW_BUILD_SYSTEM);

Modified: trunk/Source/ThirdParty/ANGLE/Configurations/ANGLE-static.xcconfig (265601 => 265602)


--- trunk/Source/ThirdParty/ANGLE/Configurations/ANGLE-static.xcconfig	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/ThirdParty/ANGLE/Configurations/ANGLE-static.xcconfig	2020-08-13 06:09:30 UTC (rev 265602)
@@ -28,4 +28,4 @@
 
 INSTALLHDRS_SCRIPT_PHASE = YES;
 USE_HEADERMAP = NO;
-APPLY_RULES_IN_COPY_HEADERS = $(USE_NEW_BUILD_SYSTEM);
+APPLY_RULES_IN_COPY_HEADERS = $(WK_USE_NEW_BUILD_SYSTEM);

Modified: trunk/Source/ThirdParty/ANGLE/Configurations/Base.xcconfig (265601 => 265602)


--- trunk/Source/ThirdParty/ANGLE/Configurations/Base.xcconfig	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/ThirdParty/ANGLE/Configurations/Base.xcconfig	2020-08-13 06:09:30 UTC (rev 265602)
@@ -113,3 +113,11 @@
 WK_USER_LTO_MODE_none = NO;
 WK_USER_LTO_MODE_ = $(WK_DEFAULT_LTO_MODE);
 WK_DEFAULT_LTO_MODE = $(WK_USER_LTO_MODE_thin);
+
+// Use a difference in the way the Legacy build sytem and XCBuild interpret
+// xcconfig file to determine which is being used.
+WK_WHICH_BUILD_SYSTEM = not_
+WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
+WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
+WK_USE_NEW_BUILD_SYSTEM_legacy = NO
+WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES

Modified: trunk/Source/WebKit/ChangeLog (265601 => 265602)


--- trunk/Source/WebKit/ChangeLog	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/WebKit/ChangeLog	2020-08-13 06:09:30 UTC (rev 265602)
@@ -1,3 +1,55 @@
+2020-08-12  Keith Rollin  <krol...@apple.com>
+
+        Remove the need for defining USE_NEW_BUILD_SYSTEM
+        https://bugs.webkit.org/show_bug.cgi?id=215439
+
+        Reviewed by Darin Adler.
+
+        When building WebKit for XCBuild, we currently require that the
+        external build system (such as the Makefile, build-webkit, etc.)
+        defines the USE_NEW_BUILD_SYSTEM=YES build setting. This build setting
+        controls parts of our build instructions that are sensitive to when
+        XCBuild or the Legacy build system are being used. Notably, we need to
+        know when to use our custom “copy and modify” scripts with copying
+        certain header files (used with the Legacy build system) vs. using the
+        enhanced Copy Headers build phase that’s enabled with
+        APPLY_RULES_IN_COPY_HEADERS=YES (introduced with and used by XCBuild).
+        The choice of which method to copy headers is used is controlled by
+        USE_NEW_BUILD_SYSTEM.
+
+        There is no built-in build setting that we can probe to help us
+        determine which approach to take when copying and modifying headers,
+        which is why we need to define USE_NEW_BUILD_SYSTEM ourselves. But it
+        turns out that we can *detect* which build system is being used by
+        taking advantage of a subtle difference between the two systems. As
+        noted in:
+
+            https://developer.apple.com/documentation/xcode-release-notes/build-system-release-notes-for-xcode-10
+
+            “When an .xcconfig file contains multiple assignments of the same
+             build setting, later assignments using $(inherited) or
+             $(<setting_name>) will inherit from earlier assignments in the
+             .xcconfig. The legacy build system caused every use of
+             $(inherited) or $(<setting_name>) skip any other values defined
+             within the .xcconfig.”
+
+        This difference can be exploited as follows:
+
+            WK_WHICH_BUILD_SYSTEM = not_
+            WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
+            WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
+            WK_USE_NEW_BUILD_SYSTEM_legacy = NO
+            WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES
+
+        We can then use WK_USE_NEW_BUILD_SYSTEM where we used to use the
+        externally-defined USE_NEW_BUILD_SYSTEM.
+
+        No new tests -- no new or changed functionality.
+
+        * Configurations/Base.xcconfig:
+        * Configurations/WebKit.xcconfig:
+        * WebKit.xcodeproj/project.pbxproj:
+
 2020-08-12  Alex Christensen  <achristen...@webkit.org>
 
         Fail preconnect requests to deprecated TLS instead of allowing application to show warning

Modified: trunk/Source/WebKit/Configurations/Base.xcconfig (265601 => 265602)


--- trunk/Source/WebKit/Configurations/Base.xcconfig	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/WebKit/Configurations/Base.xcconfig	2020-08-13 06:09:30 UTC (rev 265602)
@@ -187,3 +187,11 @@
 WK_USER_LTO_MODE_none = NO;
 WK_USER_LTO_MODE_ = $(WK_DEFAULT_LTO_MODE);
 WK_DEFAULT_LTO_MODE = $(WK_USER_LTO_MODE_thin);
+
+// Use a difference in the way the Legacy build sytem and XCBuild interpret
+// xcconfig file to determine which is being used.
+WK_WHICH_BUILD_SYSTEM = not_
+WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
+WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
+WK_USE_NEW_BUILD_SYSTEM_legacy = NO
+WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES

Modified: trunk/Source/WebKit/Configurations/WebKit.xcconfig (265601 => 265602)


--- trunk/Source/WebKit/Configurations/WebKit.xcconfig	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/WebKit/Configurations/WebKit.xcconfig	2020-08-13 06:09:30 UTC (rev 265602)
@@ -161,10 +161,7 @@
 EXCLUDED_SOURCE_FILE_NAMES[sdk=iphone*] = PluginProcessShim.dylib SecItemShim.dylib WebProcessShim.dylib *.pdf Resources/mac/* com.apple.WebKit.NetworkProcess.sb com.apple.WebKit.GPUProcess.sb com.apple.WebProcess.sb com.apple.WebKit.plugin-common.sb PlugInSandboxProfiles/*.sb;
 
 INSTALLHDRS_SCRIPT_PHASE = YES;
-APPLY_RULES_IN_COPY_HEADERS = $(WK_APPLY_RULES_IN_COPY_HEADERS_$(USE_NEW_BUILD_SYSTEM));
-WK_APPLY_RULES_IN_COPY_HEADERS_ = NO;
-WK_APPLY_RULES_IN_COPY_HEADERS_NO = NO;
-WK_APPLY_RULES_IN_COPY_HEADERS_YES = YES;
+APPLY_RULES_IN_COPY_HEADERS = $(WK_USE_NEW_BUILD_SYSTEM);
 
 WK_FRAMEWORK_HEADER_POSTPROCESSING_DISABLED[sdk=macosx*] = $(WK_FRAMEWORK_HEADER_POSTPROCESSING_DISABLED$(WK_MACOS_1016));
 WK_FRAMEWORK_HEADER_POSTPROCESSING_DISABLED_MACOS_BEFORE_1016 = YES;

Modified: trunk/Source/WebKit/WebKit.xcodeproj/project.pbxproj (265601 => 265602)


--- trunk/Source/WebKit/WebKit.xcodeproj/project.pbxproj	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/WebKit/WebKit.xcodeproj/project.pbxproj	2020-08-13 06:09:30 UTC (rev 265602)
@@ -12187,7 +12187,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nif [ \"${ACTION}\" = \"build\" -o \"${ACTION}\" = \"install\" -o \"${ACTION}\" = \"installhdrs\" -o \"${ACTION}\" = \"installapi\" ]; then\n    exec ${SRCROOT}/mac/postprocess-framework-headers.sh\nfi\n";
+			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${WK_USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nif [ \"${ACTION}\" = \"build\" -o \"${ACTION}\" = \"install\" -o \"${ACTION}\" = \"installhdrs\" -o \"${ACTION}\" = \"installapi\" ]; then\n    exec ${SRCROOT}/mac/postprocess-framework-headers.sh\nfi\n";
 		};
 		1A2180161B5454620046AEC4 /* Add Symlink in /System/Library/PrivateFrameworks */ = {
 			isa = PBXShellScriptBuildPhase;
@@ -12230,7 +12230,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nWKFOUNDATION_H=${TARGET_BUILD_DIR}/${PUBLIC_HEADERS_FOLDER_PATH}/WKFoundation.h\n\nif [[ \"${WK_FRAMEWORK_HEADER_POSTPROCESSING_DISABLED}\" == \"YES\" ]]; then\n    UNIFDEF_OPTIONS=\"-UWK_FRAMEWORK_HEADER_POSTPROCESSING_ENABLED\";\nelse\n    UNIFDEF_OPTIONS=\"-DWK_FRAMEWORK_HEADER_POSTPROCESSING_ENABLED\";\nfi\n\nunifdef -B ${UNIFDEF_OPTIONS} -o \"${WKFOUNDATION_H}\".unifdef \"${WKFOUNDATION_H}\"\n\ncase $? in\n0)\n    rm \"${WKFOUNDATION_H}\".unifdef\n    ;;\n1)\n    mv \"${WKFOUNDATION_H}\"{.unifdef,}\n    ;;\n*)\n    exit 1\nesac\n";
+			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${WK_USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nWKFOUNDATION_H=${TARGET_BUILD_DIR}/${PUBLIC_HEADERS_FOLDER_PATH}/WKFoundation.h\n\nif [[ \"${WK_FRAMEWORK_HEADER_POSTPROCESSING_DISABLED}\" == \"YES\" ]]; then\n    UNIFDEF_OPTIONS=\"-UWK_FRAMEWORK_HEADER_POSTPROCESSING_ENABLED\";\nelse\n    UNIFDEF_OPTIONS=\"-DWK_FRAMEWORK_HEADER_POSTPROCESSING_ENABLED\";\nfi\n\nunifdef -B ${UNIFDEF_OPTIONS} -o \"${WKFOUNDATION_H}\".unifdef \"${WKFOUNDATION_H}\"\n\ncase $? in\n0)\n    rm \"${WKFOUNDATION_H}\".unifdef\n    ;;\n1)\n    mv \"${WKFOUNDATION_H}\"{.unifdef,}\n    ;;\n*)\n    exit 1\nesac\n";
 		};
 		1ADAE12F1919A90C00F48E21 /* Update Info.plist with version information */ = {
 			isa = PBXShellScriptBuildPhase;
@@ -12358,7 +12358,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nWKBASE_H=${TARGET_BUILD_DIR}/${PRIVATE_HEADERS_FOLDER_PATH}/WKBase.h\n\nunifdef -B -D__APPLE__ -UBUILDING_GTK__ -UBUILDING_WPE__ -UUSE_SOUP -o \"${WKBASE_H}\".unifdef \"${WKBASE_H}\"\n\ncase $? in\n0)\n    rm \"${WKBASE_H}\".unifdef\n    ;;\n1)\n    mv \"${WKBASE_H}\"{.unifdef,}\n    ;;\n*)\n    exit 1\nesac\n";
+			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${WK_USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nWKBASE_H=${TARGET_BUILD_DIR}/${PRIVATE_HEADERS_FOLDER_PATH}/WKBase.h\n\nunifdef -B -D__APPLE__ -UBUILDING_GTK__ -UBUILDING_WPE__ -UUSE_SOUP -o \"${WKBASE_H}\".unifdef \"${WKBASE_H}\"\n\ncase $? in\n0)\n    rm \"${WKBASE_H}\".unifdef\n    ;;\n1)\n    mv \"${WKBASE_H}\"{.unifdef,}\n    ;;\n*)\n    exit 1\nesac\n";
 		};
 		37E531011B2391090074F0DF /* Copy iOS Sandbox Profiles for Manual Sandboxing */ = {
 			isa = PBXShellScriptBuildPhase;
@@ -12669,7 +12669,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nif [ \"${ACTION}\" = \"build\" -o \"${ACTION}\" = \"install\" -o \"${ACTION}\" = \"installhdrs\" -o \"${ACTION}\" = \"installapi\" ]; then\n    for HEADERS_DIRECTORY in \"${PUBLIC_HEADERS_FOLDER_PATH}\" \"${PRIVATE_HEADERS_FOLDER_PATH}\"; do\n        for HEADER_PATH in \"${TARGET_BUILD_DIR}/${HEADERS_DIRECTORY}/\"*.*; do\n            if [[ ! -z `grep '#import <WebKitAdditions/.*>' \"${HEADER_PATH}\"` ]]; then\n                python \"${SRCROOT}/mac/replace-webkit-additions-includes.py\" \"${H
 EADER_PATH}\" \"${BUILT_PRODUCTS_DIR}\" \"${SDKROOT}\" || exit $?\n            fi\n        done\n    done\nfi\n\n\n";
+			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${WK_USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nif [ \"${ACTION}\" = \"build\" -o \"${ACTION}\" = \"install\" -o \"${ACTION}\" = \"installhdrs\" -o \"${ACTION}\" = \"installapi\" ]; then\n    for HEADERS_DIRECTORY in \"${PUBLIC_HEADERS_FOLDER_PATH}\" \"${PRIVATE_HEADERS_FOLDER_PATH}\"; do\n        for HEADER_PATH in \"${TARGET_BUILD_DIR}/${HEADERS_DIRECTORY}/\"*.*; do\n            if [[ ! -z `grep '#import <WebKitAdditions/.*>' \"${HEADER_PATH}\"` ]]; then\n                python \"${SRCROOT}/mac/replace-webkit-additions-includes.py\" \"$
 {HEADER_PATH}\" \"${BUILT_PRODUCTS_DIR}\" \"${SDKROOT}\" || exit $?\n            fi\n        done\n    done\nfi\n\n\n";
 		};
 /* End PBXShellScriptBuildPhase section */
 

Modified: trunk/Source/WebKitLegacy/ChangeLog (265601 => 265602)


--- trunk/Source/WebKitLegacy/ChangeLog	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/WebKitLegacy/ChangeLog	2020-08-13 06:09:30 UTC (rev 265602)
@@ -1,3 +1,51 @@
+2020-08-12  Keith Rollin  <krol...@apple.com>
+
+        Remove the need for defining USE_NEW_BUILD_SYSTEM
+        https://bugs.webkit.org/show_bug.cgi?id=215439
+
+        Reviewed by Darin Adler.
+
+        When building WebKit for XCBuild, we currently require that the
+        external build system (such as the Makefile, build-webkit, etc.)
+        defines the USE_NEW_BUILD_SYSTEM=YES build setting. This build setting
+        controls parts of our build instructions that are sensitive to when
+        XCBuild or the Legacy build system are being used. Notably, we need to
+        know when to use our custom “copy and modify” scripts with copying
+        certain header files (used with the Legacy build system) vs. using the
+        enhanced Copy Headers build phase that’s enabled with
+        APPLY_RULES_IN_COPY_HEADERS=YES (introduced with and used by XCBuild).
+        The choice of which method to copy headers is used is controlled by
+        USE_NEW_BUILD_SYSTEM.
+
+        There is no built-in build setting that we can probe to help us
+        determine which approach to take when copying and modifying headers,
+        which is why we need to define USE_NEW_BUILD_SYSTEM ourselves. But it
+        turns out that we can *detect* which build system is being used by
+        taking advantage of a subtle difference between the two systems. As
+        noted in:
+
+            https://developer.apple.com/documentation/xcode-release-notes/build-system-release-notes-for-xcode-10
+
+            “When an .xcconfig file contains multiple assignments of the same
+             build setting, later assignments using $(inherited) or
+             $(<setting_name>) will inherit from earlier assignments in the
+             .xcconfig. The legacy build system caused every use of
+             $(inherited) or $(<setting_name>) skip any other values defined
+             within the .xcconfig.”
+
+        This difference can be exploited as follows:
+
+            WK_WHICH_BUILD_SYSTEM = not_
+            WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
+            WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
+            WK_USE_NEW_BUILD_SYSTEM_legacy = NO
+            WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES
+
+        We can then use WK_USE_NEW_BUILD_SYSTEM where we used to use the
+        externally-defined USE_NEW_BUILD_SYSTEM.
+
+        * WebKitLegacy.xcodeproj/project.pbxproj:
+
 2020-07-29  Darin Adler  <da...@apple.com>
 
         Improve range idioms and other changes to prepare the way for more reduction in live range use

Modified: trunk/Source/WebKitLegacy/WebKitLegacy.xcodeproj/project.pbxproj (265601 => 265602)


--- trunk/Source/WebKitLegacy/WebKitLegacy.xcodeproj/project.pbxproj	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/WebKitLegacy/WebKitLegacy.xcodeproj/project.pbxproj	2020-08-13 06:09:30 UTC (rev 265602)
@@ -3387,7 +3387,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nexec \"${SRCROOT}/mac/postprocess-headers.sh\"\n";
+			shellScript = "if [ \"${XCODE_VERSION_ACTUAL}\" -ge \"1140\" -a \"${WK_USE_NEW_BUILD_SYSTEM}\" = \"YES\" ]; then\n    # In this configuration, post-processing is performed at the same time as copying in the postprocess-header-rule script, so there's no need for this separate step.\n    exit 0\nfi\n\nexec \"${SRCROOT}/mac/postprocess-headers.sh\"\n";
 		};
 /* End PBXShellScriptBuildPhase section */
 

Modified: trunk/Source/WebKitLegacy/mac/ChangeLog (265601 => 265602)


--- trunk/Source/WebKitLegacy/mac/ChangeLog	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/WebKitLegacy/mac/ChangeLog	2020-08-13 06:09:30 UTC (rev 265602)
@@ -1,3 +1,52 @@
+2020-08-12  Keith Rollin  <krol...@apple.com>
+
+        Remove the need for defining USE_NEW_BUILD_SYSTEM
+        https://bugs.webkit.org/show_bug.cgi?id=215439
+
+        Reviewed by Darin Adler.
+
+        When building WebKit for XCBuild, we currently require that the
+        external build system (such as the Makefile, build-webkit, etc.)
+        defines the USE_NEW_BUILD_SYSTEM=YES build setting. This build setting
+        controls parts of our build instructions that are sensitive to when
+        XCBuild or the Legacy build system are being used. Notably, we need to
+        know when to use our custom “copy and modify” scripts with copying
+        certain header files (used with the Legacy build system) vs. using the
+        enhanced Copy Headers build phase that’s enabled with
+        APPLY_RULES_IN_COPY_HEADERS=YES (introduced with and used by XCBuild).
+        The choice of which method to copy headers is used is controlled by
+        USE_NEW_BUILD_SYSTEM.
+
+        There is no built-in build setting that we can probe to help us
+        determine which approach to take when copying and modifying headers,
+        which is why we need to define USE_NEW_BUILD_SYSTEM ourselves. But it
+        turns out that we can *detect* which build system is being used by
+        taking advantage of a subtle difference between the two systems. As
+        noted in:
+
+            https://developer.apple.com/documentation/xcode-release-notes/build-system-release-notes-for-xcode-10
+
+            “When an .xcconfig file contains multiple assignments of the same
+             build setting, later assignments using $(inherited) or
+             $(<setting_name>) will inherit from earlier assignments in the
+             .xcconfig. The legacy build system caused every use of
+             $(inherited) or $(<setting_name>) skip any other values defined
+             within the .xcconfig.”
+
+        This difference can be exploited as follows:
+
+            WK_WHICH_BUILD_SYSTEM = not_
+            WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
+            WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
+            WK_USE_NEW_BUILD_SYSTEM_legacy = NO
+            WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES
+
+        We can then use WK_USE_NEW_BUILD_SYSTEM where we used to use the
+        externally-defined USE_NEW_BUILD_SYSTEM.
+
+        * Configurations/Base.xcconfig:
+        * Configurations/WebKitLegacy.xcconfig:
+
 2020-08-05  Tim Horton  <timothy_hor...@apple.com>
 
         Remove all references to non-existent 10.16

Modified: trunk/Source/WebKitLegacy/mac/Configurations/Base.xcconfig (265601 => 265602)


--- trunk/Source/WebKitLegacy/mac/Configurations/Base.xcconfig	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/WebKitLegacy/mac/Configurations/Base.xcconfig	2020-08-13 06:09:30 UTC (rev 265602)
@@ -165,3 +165,11 @@
 WK_USER_LTO_MODE_none = NO;
 WK_USER_LTO_MODE_ = $(WK_DEFAULT_LTO_MODE);
 WK_DEFAULT_LTO_MODE = $(WK_USER_LTO_MODE_thin);
+
+// Use a difference in the way the Legacy build sytem and XCBuild interpret
+// xcconfig file to determine which is being used.
+WK_WHICH_BUILD_SYSTEM = not_
+WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
+WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
+WK_USE_NEW_BUILD_SYSTEM_legacy = NO
+WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES

Modified: trunk/Source/WebKitLegacy/mac/Configurations/WebKitLegacy.xcconfig (265601 => 265602)


--- trunk/Source/WebKitLegacy/mac/Configurations/WebKitLegacy.xcconfig	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Source/WebKitLegacy/mac/Configurations/WebKitLegacy.xcconfig	2020-08-13 06:09:30 UTC (rev 265602)
@@ -66,10 +66,8 @@
 
 INSTALLHDRS_COPY_PHASE = YES;
 INSTALLHDRS_SCRIPT_PHASE = YES;
-APPLY_RULES_IN_COPY_HEADERS = $(WK_APPLY_RULES_IN_COPY_HEADERS_$(USE_NEW_BUILD_SYSTEM));
-WK_APPLY_RULES_IN_COPY_HEADERS_ = NO;
-WK_APPLY_RULES_IN_COPY_HEADERS_NO = NO;
-WK_APPLY_RULES_IN_COPY_HEADERS_YES = YES;
+APPLY_RULES_IN_COPY_HEADERS = $(WK_USE_NEW_BUILD_SYSTEM);
+
 PRODUCT_NAME = WebKitLegacy;
 PRODUCT_BUNDLE_IDENTIFIER = com.apple.$(PRODUCT_NAME:rfc1034identifier);
 UMBRELLA_FRAMEWORKS_DIR = $(PRODUCTION_FRAMEWORKS_DIR)/WebKit.framework/Versions/A/Frameworks;

Modified: trunk/Tools/ChangeLog (265601 => 265602)


--- trunk/Tools/ChangeLog	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Tools/ChangeLog	2020-08-13 06:09:30 UTC (rev 265602)
@@ -1,3 +1,51 @@
+2020-08-12  Keith Rollin  <krol...@apple.com>
+
+        Remove the need for defining USE_NEW_BUILD_SYSTEM
+        https://bugs.webkit.org/show_bug.cgi?id=215439
+
+        Reviewed by Darin Adler.
+
+        When building WebKit for XCBuild, we currently require that the
+        external build system (such as the Makefile, build-webkit, etc.)
+        defines the USE_NEW_BUILD_SYSTEM=YES build setting. This build setting
+        controls parts of our build instructions that are sensitive to when
+        XCBuild or the Legacy build system are being used. Notably, we need to
+        know when to use our custom “copy and modify” scripts with copying
+        certain header files (used with the Legacy build system) vs. using the
+        enhanced Copy Headers build phase that’s enabled with
+        APPLY_RULES_IN_COPY_HEADERS=YES (introduced with and used by XCBuild).
+        The choice of which method to copy headers is used is controlled by
+        USE_NEW_BUILD_SYSTEM.
+
+        There is no built-in build setting that we can probe to help us
+        determine which approach to take when copying and modifying headers,
+        which is why we need to define USE_NEW_BUILD_SYSTEM ourselves. But it
+        turns out that we can *detect* which build system is being used by
+        taking advantage of a subtle difference between the two systems. As
+        noted in:
+
+            https://developer.apple.com/documentation/xcode-release-notes/build-system-release-notes-for-xcode-10
+
+            “When an .xcconfig file contains multiple assignments of the same
+             build setting, later assignments using $(inherited) or
+             $(<setting_name>) will inherit from earlier assignments in the
+             .xcconfig. The legacy build system caused every use of
+             $(inherited) or $(<setting_name>) skip any other values defined
+             within the .xcconfig.”
+
+        This difference can be exploited as follows:
+
+            WK_WHICH_BUILD_SYSTEM = not_
+            WK_WHICH_BUILD_SYSTEM = $(inherited)legacy
+            WK_USE_NEW_BUILD_SYSTEM = $(WK_USE_NEW_BUILD_SYSTEM_$(WK_WHICH_BUILD_SYSTEM))
+            WK_USE_NEW_BUILD_SYSTEM_legacy = NO
+            WK_USE_NEW_BUILD_SYSTEM_not_legacy = YES
+
+        We can then use WK_USE_NEW_BUILD_SYSTEM where we used to use the
+        externally-defined USE_NEW_BUILD_SYSTEM.
+
+        * Scripts/build-webkit:
+
 2020-08-12  Devin Rousso  <drou...@apple.com>
 
         Add settings for Copy WebKit Permalink

Modified: trunk/Tools/Scripts/build-webkit (265601 => 265602)


--- trunk/Tools/Scripts/build-webkit	2020-08-13 06:06:57 UTC (rev 265601)
+++ trunk/Tools/Scripts/build-webkit	2020-08-13 06:09:30 UTC (rev 265602)
@@ -221,10 +221,8 @@
     #if ((not defined $xcbuild or $xcbuild) and canUseXCBuild()) {
     if ($xcbuild and canUseXCBuild()) {
         push @options, "-UseNewBuildSystem=YES";
-        push @options, "USE_NEW_BUILD_SYSTEM=YES";
     } else {
         push @options, "-UseNewBuildSystem=NO";
-        push @options, "USE_NEW_BUILD_SYSTEM=NO";
     }
 
     sub option($$)
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