Currently MACOSX_VERSION_MIN is set to 10.9 for intel and 11.0 for aarch64
These produces some issues with deprecated definitions, for example:

jdk/src/java.desktop/macosx/native/libsplashscreen/splashscreen_sys.m:300:39: error: 'NSAlphaFirstBitmapFormat' is deprecated: first deprecated in macOS 10.14 [-Werror,-Wdeprecated-declarations]
                        bitmapFormat: NSAlphaFirstBitmapFormat | NSAlphaNonpremultipliedBitmapFormat
                                      ^~~~~~~~~~~~~~~~~~~~~~~~
                                      NSBitmapFormatAlphaFirst
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk/System/Library/Frameworks/AppKit.framework/Headers/NSBitmapImageRep.h:161:29: note: 'NSAlphaFirstBitmapFormat' has been explicitly marked deprecated here
static const NSBitmapFormat NSAlphaFirstBitmapFormat API_DEPRECATED_WITH_REPLACEMENT("NSBitmapFormatAlphaFirst", macos(10.5,10.14)) = NSBitmapFormatAlphaFirst;
                            ^
jdk/src/java.desktop/macosx/native/libsplashscreen/splashscreen_sys.m:300:66: error: 'NSAlphaNonpremultipliedBitmapFormat' is deprecated: first deprecated in macOS 10.14 [-Werror,-Wdeprecated-declarations]
                        bitmapFormat: NSAlphaFirstBitmapFormat | NSAlphaNonpremultipliedBitmapFormat
                                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                                 NSBitmapFormatAlphaNonpremultiplied
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk/System/Library/Frameworks/AppKit.framework/Headers/NSBitmapImageRep.h:162:29: note: 'NSAlphaNonpremultipliedBitmapFormat' has been explicitly marked deprecated here
static const NSBitmapFormat NSAlphaNonpremultipliedBitmapFormat API_DEPRECATED_WITH_REPLACEMENT("NSBitmapFormatAlphaNonpremultiplied", macos(10.0,10.14)) = NSBitmapFormatAlphaNonpremultiplied;
                            ^
jdk/src/java.desktop/macosx/native/libsplashscreen/splashscreen_sys.m:438:34: error: 'NSBorderlessWindowMask' is deprecated: first deprecated in macOS 10.12 [-Werror,-Wdeprecated-declarations]
                      styleMask: NSBorderlessWindowMask
                                 ^~~~~~~~~~~~~~~~~~~~~~
                                 NSWindowStyleMaskBorderless
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk/System/Library/Frameworks/AppKit.framework/Headers/NSWindow.h:885:32: note: 'NSBorderlessWindowMask' has been explicitly marked deprecated here
static const NSWindowStyleMask NSBorderlessWindowMask API_DEPRECATED_WITH_REPLACEMENT("NSWindowStyleMaskBorderless", macos(10.0,10.12)) = NSWindowStyleMaskBorderless;

these definition can be updated to their newer versions (for example NSBorderlessWindowMask to NSWindowStyleMaskBorderless) but this might break current macos_intel code (as minimal version for intel is 10.9 and some of new definitions are 10.12+.
Solution universal to macos_intel (10.9 target) and macos_arch64(11.0 target) needs to be implemented

Currently these warnings are suppressed by "DISABLED_WARNINGS_clang := deprecated-declarations" in Awt2dLibraries.gmk