Add file size optimisations to Release build

* Remove `dome-key-map/target/debug` from Release library search paths.
  This was causing the Release build to link against the debug version
  of dome-key-map, resulting in a 25 Mb binary.
* Strip debug symbols
* Turn on link-time optimisation

This takes the Release binary down to 1.5 Mb.

Added an `archive` target to the Makefile. This does additional
optimisations (maybe stripping symbols?), and gives us a final binary
size of 1.1 Mb. Much better.

2 files changed, 23 insertions, 7 deletions

diff --git a/DomeKey.xcodeproj/project.pbxproj b/DomeKey.xcodeproj/project.pbxproj
index 58ec3a0..3b7b7ca 100644
--- a/DomeKey.xcodeproj/project.pbxproj
+++ b/DomeKey.xcodeproj/project.pbxproj
@@ -16,7 +16,6 @@
 		D160C2A12118EF9D007D1B50 /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = D160C2A02118EF9D007D1B50 /* main.m */; };
 		D18255B12180018C00ABC1E0 /* LicenseHandler.m in Sources */ = {isa = PBXBuildFile; fileRef = D18255B02180018C00ABC1E0 /* LicenseHandler.m */; };
 		D1C80CA021877E8200011088 /* Sounds.m in Sources */ = {isa = PBXBuildFile; fileRef = D1C80C9F21877E8200011088 /* Sounds.m */; };
-		D1E1020B21350BAD00B2CA29 /* libdome_key_map.a in Frameworks */ = {isa = PBXBuildFile; fileRef = D1E1020A21350BAD00B2CA29 /* libdome_key_map.a */; };
 		D1EAA7A421803BB300A0AC35 /* XDG.m in Sources */ = {isa = PBXBuildFile; fileRef = D1EAA7A321803BB300A0AC35 /* XDG.m */; };
 /* End PBXBuildFile section */
 
@@ -87,7 +86,6 @@
 		D18255B02180018C00ABC1E0 /* LicenseHandler.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = LicenseHandler.m; sourceTree = "<group>"; };
 		D1C80C9E21877E8200011088 /* Sounds.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = Sounds.h; sourceTree = "<group>"; };
 		D1C80C9F21877E8200011088 /* Sounds.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = Sounds.m; sourceTree = "<group>"; };
-		D1E1020A21350BAD00B2CA29 /* libdome_key_map.a */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; name = libdome_key_map.a; path = "lib/dome-key-map/target/debug/libdome_key_map.a"; sourceTree = "<group>"; };
 		D1E1020C21350D4100B2CA29 /* dome_key_map.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = dome_key_map.h; path = "lib/dome-key-map/dome_key_map.h"; sourceTree = SOURCE_ROOT; };
 		D1EAA7A221803BB300A0AC35 /* XDG.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = XDG.h; sourceTree = "<group>"; };
 		D1EAA7A321803BB300A0AC35 /* XDG.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = XDG.m; sourceTree = "<group>"; };
@@ -99,7 +97,6 @@
 			buildActionMask = 2147483647;
 			files = (
 				D110C94A2122F1ED0094F963 /* libddhid.a in Frameworks */,
-				D1E1020B21350BAD00B2CA29 /* libdome_key_map.a in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -149,7 +146,6 @@
 			isa = PBXGroup;
 			children = (
 				D160C31521197983007D1B50 /* DDHidLib.xcodeproj */,
-				D1E1020A21350BAD00B2CA29 /* libdome_key_map.a */,
 			);
 			name = Frameworks;
 			sourceTree = "<group>";
@@ -406,7 +402,10 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/lib/dome-key-map/target/debug",
 				);
-				OTHER_LDFLAGS = "-ObjC";
+				OTHER_LDFLAGS = (
+					"-ObjC",
+					"-ldome_key_map",
+				);
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
 			};
@@ -416,12 +415,18 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
+				COPY_PHASE_STRIP = YES;
+				GCC_GENERATE_DEBUGGING_SYMBOLS = NO;
 				HEADER_SEARCH_PATHS = "$(PROJECT_DIR)/lib/DDHidLib/lib";
 				LIBRARY_SEARCH_PATHS = (
 					"$(inherited)",
-					"$(PROJECT_DIR)/lib/dome-key-map/target/debug",
+					"$(PROJECT_DIR)/lib/dome-key-map/target/release",
+				);
+				LLVM_LTO = YES;
+				OTHER_LDFLAGS = (
+					"-ObjC",
+					"-ldome_key_map",
 				);
-				OTHER_LDFLAGS = "-ObjC";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
 			};
diff --git a/Makefile b/Makefile
index 02b2a62..f2029ff 100644
--- a/Makefile
+++ b/Makefile
@@ -40,6 +40,17 @@ $(RUST_LIB_RELEASE): $(RUST_SOURCE_FILES)
 	$(MAKE) -C $(RUST_DIR) $(RUST_LOCAL_LIB_RELEASE)
 
 
+# Archive
+
+.PHONY: archive
+archive: clean-release
+	xcodebuild -project DomeKey.xcodeproj \
+		-scheme DomeKey \
+		-configuration Release \
+		archive \
+		-archivePath build/Release.xcarchive
+
+
 # Sounds
 
 DomeKey/sound_data.h: sounds/*.mp3