Minimize tools-only build

Avoid unnecessary work and dependencies when building tools and no
emulator.
* makefile: Skip compressing layouts and converting translations if the
  emulator isn't being built.
* scripts/src/3rdparty.lua: Make libraries not needed by tools
  conditional on the 'with-emulator' genie option.
* scripts/src/osd/modules.lua: Refactor module file inclusion to
  optionally omit implementations other than 'none', as tools don't
  depend on modules.
* scripts/src/{cpu,devices}.lua: Refactor CPU core file inclusion to
  collect these similarly to the disassembler files and only build the
  'optional' project including them if the emulator is being built.
* Make 'qtdbg' projects conditional on USE_QTDEBUG to avoid warnings
  when Qt libraries aren't present, as tools don't need them.

makefile

@@ -41,6 +41,7 @@
 # NO_USE_XINPUT = 1
 # NO_USE_XINPUT_WII_LIGHTGUN_HACK = 1
 # FORCE_DRC_C_BACKEND = 1
+# NO_MODULE_IMPLS = 1
 
 # DEBUG = 1
 # PROFILER = 1
@@ -496,6 +497,23 @@ OSD := sdl
 endif
 endif
 
+#-------------------------------------------------
+# auto-disable unnecessary features if the
+# emulator isn't going to be built
+#-------------------------------------------------
+ifdef EMULATOR
+ifeq '$(EMULATOR)' '0'
+NO_X11 = 1
+NO_OPENGL = 1
+USE_WAYLAND = 0
+USE_QTDEBUG = 0
+NO_USE_MIDI = 1
+NO_USE_PORTAUDIO = 1
+NO_USE_PULSEAUDIO = 1
+NO_MODULE_IMPLS = 1
+endif
+endif
+
 #-------------------------------------------------
 # which 3rdparty library to build;
 #  link against system (common) library otherwise
@@ -769,6 +787,10 @@ ifdef USE_DISPATCH_GL
 PARAMS += --USE_DISPATCH_GL='$(USE_DISPATCH_GL)'
 endif
 
+ifdef NO_MODULE_IMPLS
+PARAMS += --NO_MODULE_IMPLS='$(NO_MODULE_IMPLS)'
+endif
+
 ifdef NO_USE_MIDI
 PARAMS += --NO_USE_MIDI='$(NO_USE_MIDI)'
 endif
@@ -1554,12 +1576,16 @@ $(GEN_FOLDERS):
 
 genie: $(GENIE)
 
+ifneq '$(EMULATOR)' '0'
 generate: \
 		genie \
 		$(GEN_FOLDERS) \
 		$(GENDIR)/version.cpp \
 		$(patsubst %.po,%.mo,$(call rwildcard, language/, *.po)) \
 		$(patsubst $(SRC)/%.lay,$(GENDIR)/%.lh,$(LAYOUTS))
+else
+generate: genie $(GENDIR)/version.cpp
+endif
 
 ifneq ($(NEW_GIT_VERSION),$(OLD_GIT_VERSION))
 stale:

scripts/src/3rdparty.lua

@@ -228,6 +228,7 @@ end
 -- SoftFloat library objects
 --------------------------------------------------
 
+if _OPTIONS["with-emulator"] then
 project "softfloat"
 	uuid "04fbf89e-4761-4cf2-8a12-64500cf0c5c5"
 	kind "StaticLib"
@@ -265,12 +266,14 @@ end
 		MAME_DIR .. "3rdparty/softfloat/fyl2x.c",
 		MAME_DIR .. "3rdparty/softfloat/f2xm1.c",
 	}
+end
 
 
 --------------------------------------------------
 -- SoftFloat 3 library objects
 --------------------------------------------------
 
+if _OPTIONS["with-emulator"] then
 project "softfloat3"
 	uuid "9c22fc90-53fd-11e8-b566-0800200c9a66"
 	kind "StaticLib"
@@ -629,13 +632,14 @@ end
 		MAME_DIR .. "3rdparty/softfloat3/bochs_ext/poly.c",
 		MAME_DIR .. "3rdparty/softfloat3/bochs_ext/extF80_scale.c",
 	}
+end
 
 
 -------------------------------------------------
 -- libJPEG library objects
 --------------------------------------------------
 
-if not _OPTIONS["with-system-jpeg"] then
+if _OPTIONS["with-emulator"] and not _OPTIONS["with-system-jpeg"] then
 project "jpeg"
 	uuid "447c6800-dcfd-4c48-b72a-a8223bb409ca"
 	kind "StaticLib"
@@ -954,7 +958,7 @@ end
 --------------------------------------------------
 if (STANDALONE~=true) then
 
-if not _OPTIONS["with-system-lua"] then
+if _OPTIONS["with-emulator"] and not _OPTIONS["with-system-lua"] then
 project "lua"
 	uuid "d9e2eed1-f1ab-4737-a6ac-863700b1a5a9"
 	kind "StaticLib"
@@ -1044,6 +1048,7 @@ end
 -- small lua library objects
 --------------------------------------------------
 
+if _OPTIONS["with-emulator"] then
 project "lualibs"
 	uuid "1d84edab-94cf-48fb-83ee-b75bc697660e"
 	kind "StaticLib"
@@ -1093,12 +1098,13 @@ project "lualibs"
 		MAME_DIR .. "3rdparty/luafilesystem/src/lfs.c",
 		MAME_DIR .. "3rdparty/lua-linenoise/linenoise.c",
 	}
+end
 
 --------------------------------------------------
 -- SQLite3 library objects
 --------------------------------------------------
 
-if not _OPTIONS["with-system-sqlite3"] then
+if _OPTIONS["with-emulator"] and not _OPTIONS["with-system-sqlite3"] then
 project "sqlite3"
 	uuid "5cb3d495-57ed-461c-81e5-80dc0857517d"
 	kind "StaticLib"
@@ -1240,6 +1246,7 @@ end
 -- BX library objects
 --------------------------------------------------
 
+if _OPTIONS["with-emulator"] then
 project "bx"
 	uuid "238318fe-49f5-4eb4-88be-0618900f5eac"
 	kind "StaticLib"
@@ -1318,12 +1325,14 @@ project "bx"
 		MAME_DIR .. "3rdparty/bx/src/timer.cpp",
 		MAME_DIR .. "3rdparty/bx/src/url.cpp",
 	}
+end
 
 
 --------------------------------------------------
 -- BIMG library objects
 --------------------------------------------------
 
+if _OPTIONS["with-emulator"] then
 project "bimg"
 	uuid "5603611b-8bf8-4ffd-85bc-76858cd7df39"
 	kind "StaticLib"
@@ -1437,12 +1446,14 @@ project "bimg"
 
 		MAME_DIR .. "3rdparty/bimg/3rdparty/tinyexr/deps/miniz/miniz.c",
 	}
+end
 
 
 --------------------------------------------------
 -- BGFX library objects
 --------------------------------------------------
 
+if _OPTIONS["with-emulator"] then
 project "bgfx"
 	uuid "d3e7e119-35cf-4f4f-aba0-d3bdcd1b879a"
 	kind "StaticLib"
@@ -1633,6 +1644,7 @@ end
 			"-D BGFX_CONFIG_MULTITHREADED=0",
 		}
 	end
+end
 
 
 --------------------------------------------------
@@ -1813,6 +1825,7 @@ end
 -- linenoise library
 --------------------------------------------------
 
+if _OPTIONS["with-emulator"] then
 project "linenoise"
 	uuid "7320ffc8-2748-4add-8864-ae29b72a8511"
 	kind (LIBTYPE)
@@ -1839,6 +1852,7 @@ project "linenoise"
 		MAME_DIR .. "3rdparty/linenoise/stringbuf.c",
 		MAME_DIR .. "3rdparty/linenoise/utf8.c",
 	}
+end
 
 
 --------------------------------------------------
@@ -1875,6 +1889,7 @@ end
 -- wdlfft library objects (from Cockos WDL)
 --------------------------------------------------
 
+if _OPTIONS["with-emulator"] then
 project "wdlfft"
 	uuid "74ca017e-fa0d-48b8-81d6-8081a37be14c"
 	kind "StaticLib"
@@ -1890,12 +1905,14 @@ project "wdlfft"
 		MAME_DIR .. "3rdparty/wdlfft/fft.c",
 		MAME_DIR .. "3rdparty/wdlfft/fft.h"
 	}
+end
 
 
 --------------------------------------------------
 -- ymfm library objects
 --------------------------------------------------
 
+if _OPTIONS["with-emulator"] then
 project "ymfm"
 	uuid "2403a536-cb0a-4b50-b41f-10c17917689b"
 	kind "StaticLib"
@@ -1928,6 +1945,7 @@ project "ymfm"
 		MAME_DIR .. "3rdparty/ymfm/src/ymfm_ssg.cpp",
 		MAME_DIR .. "3rdparty/ymfm/src/ymfm_ssg.h",
 	}
+end
 
 
 --------------------------------------------------