Only download Microchip pack if avr-libc doesnt support ATtiny3216

CMakeLists.txt

@@ -5,17 +5,47 @@ set(AVR_MCU "attiny3216")
 
 set(CMAKE_TOOLCHAIN_FILE "${CMAKE_CURRENT_SOURCE_DIR}/cmake/avr-gcc-toolchain.cmake")
 
-project(avr-avc-lan VERSION 1 LANGUAGES C ASM)
+project(avr-avc-lan VERSION 1 LANGUAGES C CXX ASM)
 
-include(FetchContent)
-# attiny_atpack_SOURCE_DIR is downloaded/extracted location
-FetchContent_Declare(
-    attiny_atpack
-    URL http://packs.download.atmel.com/Atmel.ATtiny_DFP.2.0.368.atpack
-    URL_HASH SHA512=ee16a8ebecb57bd998a9cd4373368e3d45982cbbc3825e18d1dcac58215db6b9d907ad1ba2020cba9187fed7ba8c6f255a4fa1214e40c7a17ab2d18474f4d079
-    DOWNLOAD_NAME Atmel.ATtiny_DFP.2.0.368.atpack.zip
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "8.3")
+    message(FATAL_ERROR "Insufficient AVR-GCC version; Support for ATtiny3216 was added in GCC v8")
+  endif()
+endif()
+
+# Handle libc versioning
+try_compile(LIBC_VERSION_TEST
+    SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/cmake/libc-version-test.cpp"
+    COMPILE_DEFINITIONS -mmcu=${AVR_MCU}
 )
-FetchContent_MakeAvailable(attiny_atpack)
+
+if(NOT LIBC_VERSION_TEST)
+    include(FetchContent)
+    # attiny_atpack_SOURCE_DIR is downloaded/extracted location
+    FetchContent_Declare(
+        attiny_atpack
+        URL http://packs.download.atmel.com/Atmel.ATtiny_DFP.2.0.368.atpack
+        URL_HASH SHA512=ee16a8ebecb57bd998a9cd4373368e3d45982cbbc3825e18d1dcac58215db6b9d907ad1ba2020cba9187fed7ba8c6f255a4fa1214e40c7a17ab2d18474f4d079
+        DOWNLOAD_NAME Atmel.ATtiny_DFP.2.0.368.atpack.zip
+    )
+    FetchContent_MakeAvailable(attiny_atpack)
+    try_compile(LIBC_VERSION_TEST
+        SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/cmake/libc-version-test.cpp"
+        COMPILE_DEFINITIONS
+            -B "${attiny_atpack_SOURCE_DIR}/gcc/dev/${AVR_MCU}"
+            -isystem "${attiny_atpack_SOURCE_DIR}/include"
+            -mmcu=${AVR_MCU}
+    )
+    if(NOT LIBC_VERSION_TEST)
+        message(FATAL_ERROR "Insufficient AVR-LIBC/Microchip pack for chosen MCU '${AVR_MCU}'")
+    else()
+        include_directories(SYSTEM PUBLIC "${attiny_atpack_SOURCE_DIR}/include")
+        add_compile_options(
+            -B "${attiny_atpack_SOURCE_DIR}/gcc/dev/${AVR_MCU}"
+        )
+    endif()
+endif()
+
 
 set(CMAKE_C_STANDARD 17)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
@@ -38,7 +68,6 @@ add_avr_executable(sniffer
     src/avclandrv.c
     src/GlobalDef.c)
 
-target_include_directories(sniffer SYSTEM PUBLIC "${attiny_atpack_SOURCE_DIR}/include")
 target_link_options(sniffer PUBLIC
     -B "${attiny_atpack_SOURCE_DIR}/gcc/dev/${AVR_MCU}"
 )
@@ -46,7 +75,6 @@ target_compile_definitions(sniffer PRIVATE
     F_CPU=16000000L
 )
 target_compile_options(sniffer PRIVATE
-    -B "${attiny_atpack_SOURCE_DIR}/gcc/dev/${AVR_MCU}"
     --param=min-pagesize=0
     -ffunction-sections
     -fdata-sections

cmake/libc-version-test.cpp

@@ -0,0 +1,17 @@
+#if __has_include(<component-version.h>)
+#include <component-version.h>
+#if ((COMPONENT_VERSION_MAJOR == 1) && (COMPONENT_VERSION_MINOR == 2) &&       \
+     (BUILD_NUMBER < 118))
+#error                                                                         \
+    "Microchip pack component version greater than 1.2.118 required to support ATtiny3216"
+#endif
+#else
+#include <avr/version.h>
+#if !(__AVR_LIBC_VERSION__ > 20100UL)
+#error "AVR LibC version greater than 2.1 does support ATtiny3216"
+#endif
+#endif
+
+#include <avr/io.h>
+
+int main() { return 0; }

src/avclandrv.c

@@ -47,6 +47,11 @@
   __asm__ __volatile__(                                                        \
       "cbi %[vporta_out], 6;" ::[vporta_out] "I"(_SFR_IO_ADDR(VPORTA_OUT)));
 
+// Name difference between avr-libc and Microchip pack
+#if defined(EVSYS_ASYNCCH00_bm)
+#define EVSYS_ASYNCCH0_0_bm EVSYS_ASYNCCH00_bm
+#endif
+
 uint8_t CD_ID_1;
 uint8_t CD_ID_2;