(MacOS) Add ARM 64bit support

.gitlab-ci.yml

@@ -33,6 +33,10 @@ include:
   - project: 'libretro-infrastructure/ci-templates'
     file: '/osx-x64.yml'
 
+  # MacOS ARM 64-bit
+  - project: 'libretro-infrastructure/ci-templates'
+    file: '/osx-arm64.yml'
+
   ################################## CELLULAR ################################
   # Android
   - project: 'libretro-infrastructure/ci-templates'
@@ -109,6 +113,12 @@ libretro-build-osx-x64:
     - .libretro-osx-x64-make-default
     - .core-defs
 
+# MacOS ARM 64-bit
+libretro-build-osx-arm64:
+  extends:
+    - .libretro-osx-arm64-make-default
+    - .core-defs
+
 ################################### CELLULAR #################################
 # Android ARMv7a
 android-armeabi-v7a:

Makefile

@@ -34,6 +34,15 @@ else ifeq ($(platform), osx)
    TARGET := $(TARGET_NAME)_libretro.dylib
    fpic := -fPIC
    SHARED := -dynamiclib
+
+   ifeq ($(CROSS_COMPILE),1)
+		TARGET_RULE   = -target $(LIBRETRO_APPLE_PLATFORM) -isysroot $(LIBRETRO_APPLE_ISYSROOT)
+		CFLAGS   += $(TARGET_RULE)
+		CPPFLAGS += $(TARGET_RULE)
+		CXXFLAGS += $(TARGET_RULE)
+		LDFLAGS  += $(TARGET_RULE)
+   endif
+
 else ifneq (,$(findstring ios,$(platform)))
    TARGET := $(TARGET_NAME)_libretro_ios.dylib
    fpic := -fPIC