Set up clangd for intellisense. Whoof, that was difficult.

.clangd

@@ -0,0 +1,8 @@
+
+
+InlayHints:
+  Enabled: Yes
+  DeducedTypes: Yes
+  ParameterNames: Yes
+  Designators: Yes
+

Integration.code-workspace.tpl.json

@@ -36,10 +36,18 @@
             "**/x86_64-linux-gnu/**": "cpp",
             "*.ipp": "cpp",
             "*.inc": "cpp"
-        }
+        },
+        "C_Cpp.intelliSenseEngine": "disabled",
+        "clangd.path": "/usr/bin/clangd-15",
+        "clangd.arguments": [
+          "--compile-commands-dir=[INTEGRATION]/.vscode",
+          "--header-insertion=never"
+        ],
+        "C_Cpp.autocomplete": "Disabled"
     },
     "extensions": {
         "recommendations": [
+            "llvm-vs-code-extensions.vscode-clangd",
             "vadimcn.vscode-lldb",
             "dfarley1.file-picker",
             "ms-python.python",
@@ -73,6 +81,16 @@
                 },
                 "problemMatcher": "$msCompile",
                 "type": "shell"
+            },
+            {
+                "label": "Make Intellisense",
+                "group": "build",
+                "command": "make intellisense",
+                "presentation": {
+                    "clear": true
+                },
+                "problemMatcher": "$msCompile",
+                "type": "shell"
             }
         ]
     },

Makefile.tpl.txt

@@ -2,11 +2,26 @@
 #
 # Do not edit Makefile, instead, edit Makefile.tpl.txt
 #
+# It is not usually necessary to rebuild the intellisense database
+# unless you've added a source file.
+#
+
 
 all:
 	(cd luprex ; make all)
-	[UNREALENGINE]/Engine/Build/BatchFiles/[BUILD_BAT] IntegrationEditor [OS] DebugGame [INTEGRATION]/Integration.uproject -waitmutex
+	[UNREALENGINE]/Engine/Build/BatchFiles/[BUILD_BAT] -waitmutex IntegrationEditor [OS] DebugGame [INTEGRATION]/Integration.uproject
 
 clean:
 	(cd luprex ; make clean)
-	[UNREALENGINE]/Engine/Build/BatchFiles/[BUILD_BAT] IntegrationEditor [OS] DebugGame [INTEGRATION]/Integration.uproject -waitmutex -clean
+	[UNREALENGINE]/Engine/Build/BatchFiles/[BUILD_BAT] -waitmutex IntegrationEditor [OS] DebugGame [INTEGRATION]/Integration.uproject -clean
+	rm -f .vscode/compile_commands.json
+
+intellisense: all
+	(cd [INTEGRATION] ; find Intermediate -type f -name '*.rsp' -print0 | tar --null -czf rsp_files.tgz --files-from=-)
+	(cd [UNREALENGINE] ; find Engine -type f -name '*.rsp' -print0 | tar --null -czf rsp_files.tgz --files-from=-)
+	[UNREALENGINE]/Engine/Build/BatchFiles/[BUILD_BAT] -waitmutex UnrealEditor [OS] DebugGame -mode=GenerateClangDatabase -OutputDir=[UNREALENGINE]/.vscode
+	[UNREALENGINE]/Engine/Build/BatchFiles/[BUILD_BAT] -waitmutex IntegrationEditor [OS] DebugGame [INTEGRATION]/Integration.uproject -mode=GenerateClangDatabase -OutputDir=[UNREALENGINE]/.vscode
+	cat [UNREALENGINE]/.vscode/compile_commands.json >> [INTEGRATION]/.vscode/compile_commands.json
+	(cd [INTEGRATION] ; tar xfz rsp_files.tgz)
+	(cd [UNREALENGINE] ; tar xfz rsp_files.tgz)
+	rm -f [INTEGRATION]/rsp_files.tgz [UNREALENGINE]/rsp_files.tgz

README.md

@@ -9,6 +9,8 @@ Install important Software
     - install git-lfs support.  Usually: apt-get install git-lfs
     - install visual studio code.  Usually: apt-get install code  
     - install dotnet6.  Usually: apt-get install dotnet6
+    - install clangd-15.  Usually: apt-get install clangd-15
+    - install jq.  On Linux, this is usually already installed.
     - install python3.  On Linux, this is usually already installed.
 
 Git Clone the UnrealEngine repository:  
@@ -25,11 +27,6 @@ Git Clone the integration Repository
 Apply patches and build everything:
     - Change directory to $HOME/integration
     - python3 build-everything.py
-    -
-    - Note: build-everything is mainly intended for the *initial* build.
-    - If you want to edit the code and recompile, it is okay to use
-    - build-everything.py a second time, but it's unnecessarily slow.
-    - It's much faster to edit and recompile using visual studio code.
 
 Launch Integration in the Debugger  
     - Change directory to $HOME/integration  

build-everything.py

@@ -58,6 +58,7 @@ else:
 
 CONFIG["INTEGRATION"] = os.path.dirname(os.path.abspath(sys.argv[0]))
 CONFIG["UNREALENGINE"] = os.path.join(os.path.dirname(CONFIG["INTEGRATION"]), "UnrealEngine")
+CONFIG["UE_BUILD_BAT"] = CONFIG["UNREALENGINE"] + "/Engine/Build/BatchFiles/" + CONFIG["BUILD_BAT"] + " -waitmutex"
 
 globals().update(CONFIG)
 
@@ -72,9 +73,7 @@ if not os.path.isdir(f"{UNREALENGINE}/Engine/Source/Editor"):
 
 #
 # This is the code for a simple json preprocessor that can
-# expand "for-each" loops and substitute variables.  Because
+# expand "for-each" loops and substitute variables.
-# a single string is valid json, you can also use this to
-# substitute variables in a string or a text file.
 #
 
 JSON_VAR_REGEX = re.compile(r'\[([A-Z0-9_]+)\]')
@@ -105,6 +104,11 @@ def expand_json_file(sourcefile, outputfile):
     expanded = expand_json(data, CONFIG)
     Path(outputfile).write_text(json.dumps(expanded, indent=4))
 
+#
+# Because a single string is valid json, we can also use the json
+# expander to substitute variables in plain old text files.
+#
+
 def expand_text_file(sourcefile, outputfile):
     Path(outputfile).unlink(missing_ok=True)
     data = Path(sourcefile).read_text()
@@ -207,13 +211,14 @@ expand_json_file(f"{INTEGRATION}/Integration.code-workspace.tpl.json",
 expand_text_file(f"{INTEGRATION}/Makefile.tpl.txt",
                  f"{INTEGRATION}/Makefile")
 
-
 #
 # Build ShaderCompileWorker
 #
 
 print("Building ShaderCompileWorker...")
-shell(UNREALENGINE, f"{UNREALENGINE}/Engine/Build/BatchFiles/{BUILD_BAT} ShaderCompileWorker {OS} Shipping -waitmutex")
+
+shell(UNREALENGINE, f"{UNREALENGINE}/Engine/Build/BatchFiles/{BUILD_BAT} -waitmutex ShaderCompileWorker {OS} Shipping")
+
 Path(f"Engine/Binaries/{OS}/ShaderCompileWorker{DOT_EXE}").unlink(missing_ok=True)
 shutil.copyfile(f"{UNREALENGINE}/Engine/Binaries/{OS}/ShaderCompileWorker-{OS}-Shipping{DOT_EXE}", f"{UNREALENGINE}/Engine/Binaries/{OS}/ShaderCompileWorker{DOT_EXE}")
 
@@ -221,5 +226,5 @@ shutil.copyfile(f"{UNREALENGINE}/Engine/Binaries/{OS}/ShaderCompileWorker-{OS}-S
 # Run Make
 #
 
-shell(INTEGRATION, 'make')
+shell(INTEGRATION, 'make intellisense')