Enable building projects that are separate of MAME but use same core …

…and lives in separate git tree (nw)

.gitignore

@@ -21,6 +21,7 @@
 !/language/
 !/nl_examples/
 !/plugins/
+!/projects/
 !/regtests/
 !/samples/
 !/scripts/

makefile

@@ -217,6 +217,10 @@ endif
 # build scripts will be run from
 # scripts/target/$(TARGET)/$(SUBTARGET).lua
 #-------------------------------------------------
+ifdef PROJECT
+PARAMS += --PROJECT='$(PROJECT)'
+TARGET := $(PROJECT)
+endif
 
 ifndef TARGET
 TARGET := mame
@@ -800,8 +804,12 @@ SCRIPTS += scripts/target/$(TARGET)/mess.lua
 endif
 
 ifndef SOURCES
+ifdef PROJECT 
+SCRIPTS += projects/$(PROJECT)/scripts/target/$(TARGET)/$(SUBTARGET_FULL).lua
+else
 SCRIPTS += scripts/target/$(TARGET)/$(SUBTARGET_FULL).lua
 endif
+endif
 
 ifdef REGENIE
 SCRIPTS+= regenie

projects/.gitignore

@@ -0,0 +1,3 @@
+*
+!/.gitignore
+!/README.md

projects/README.md

@@ -0,0 +1,4 @@
+# **Projects** #
+
+This is place where source code projects outside of MAME lives.
+Here you can git clone that kind of project and make it with "make PROJECT=example"

scripts/genie.lua

@@ -386,6 +386,11 @@ newoption {
 	description = "Produce WebAssembly output when building with Emscripten.",
 }
 
+newoption {
+	trigger = "PROJECT",
+	description = "Select projects to be built. Will look into project folder for files.",
+}
+
 dofile ("extlib.lua")
 
 if _OPTIONS["SHLIB"]=="1" then
@@ -516,7 +521,14 @@ msgprecompile ("Precompiling $(subst ../,,$<)...")
 
 messageskip { "SkipCreatingMessage", "SkipBuildingMessage", "SkipCleaningMessage" }
 
-if (_OPTIONS["SOURCES"] == nil) then
+if (_OPTIONS["PROJECT"] ~= nil) then
+	PROJECT_DIR = path.join(path.getabsolute(".."),"projects",_OPTIONS["PROJECT"]) .. "/"
+	if (not os.isfile(path.join("..", "projects", _OPTIONS["PROJECT"], "scripts", "target", _OPTIONS["target"],_OPTIONS["subtarget"] .. ".lua"))) then
+		error("File definition for TARGET=" .. _OPTIONS["target"] .. " SUBTARGET=" .. _OPTIONS["subtarget"] .. " does not exist")
+	end
+	dofile (path.join(".." ,"projects", _OPTIONS["PROJECT"], "scripts", "target", _OPTIONS["target"],_OPTIONS["subtarget"] .. ".lua"))
+end
+if (_OPTIONS["SOURCES"] == nil and _OPTIONS["PROJECT"] == nil) then
 	if (not os.isfile(path.join("target", _OPTIONS["target"],_OPTIONS["subtarget"] .. ".lua"))) then
 		error("File definition for TARGET=" .. _OPTIONS["target"] .. " SUBTARGET=" .. _OPTIONS["subtarget"] .. " does not exist")
 	end

scripts/src/main.lua

@@ -276,8 +276,12 @@ end
 	links {
 		ext_lib("zlib"),
 		ext_lib("flac"),
+	}
+if (STANDALONE~=true) then
+	links {
 		ext_lib("sqlite3"),
 	}
+end
 
 	if _OPTIONS["NO_USE_MIDI"]~="1" then
 		links {