AVR_GCC: for newer versions of gcc just write a warning, don't consider it an error

	modified:   src/targets/atmega128/avr.c
	modified:   src/targets/simulavr/avr.c
	modified:   src/targets/xmega128a4u/avr_os.c

Author: popovec

src/targets/atmega128/avr.c

@@ -3,7 +3,7 @@
 
     This is part of OsEID (Open source Electronic ID)
 
-    Copyright (C) 2015-2019 Peter Popovec, popovec.peter@gmail.com
+    Copyright (C) 2015-2025 Peter Popovec, popovec.peter@gmail.com
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -41,7 +41,7 @@
 #endif
 
 #ifndef X_GCC_OK
-#error only AVR GCC version 4.8.1 / 4.9.2 / 5.4.0 are tested to compile this code
+#warning only AVR GCC version 4.8.1 / 4.9.2 / 5.4.0 are tested to compile this code
 #endif
 
 

src/targets/simulavr/avr.c

@@ -3,7 +3,7 @@
 
     This is part of OsEID (Open source Electronic ID)
 
-    Copyright (C) 2015-2019 Peter Popovec, popovec.peter@gmail.com
+    Copyright (C) 2015-2025 Peter Popovec, popovec.peter@gmail.com
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -46,7 +46,7 @@
 #endif
 
 #ifndef X_GCC_OK
-#error only AVR GCC version 4.8.1 / 4.9.2 / 5.4.0 are tested to compile this code
+#warning only AVR GCC version 4.8.1 / 4.9.2 / 5.4.0 are tested to compile this code
 #endif
 
 

src/targets/xmega128a4u/avr_os.c

@@ -3,7 +3,7 @@
 
     This is part of OsEID (Open source Electronic ID)
 
-    Copyright (C) 2015-2021 Peter Popovec, popovec.peter@gmail.com
+    Copyright (C) 2015-2025 Peter Popovec, popovec.peter@gmail.com
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -42,7 +42,7 @@
 #endif
 
 #ifndef X_GCC_OK
-#error only AVR GCC version 4.8.1 / 4.9.2 / 5.4.0 are tested to compile this code
+#warning only AVR GCC version 4.8.1 / 4.9.2 / 5.4.0 are tested to compile this code
 #endif