Add PROGMEM size check

Author: felias-fogg

platform.txt

@@ -35,6 +35,7 @@ compiler.elf2hex.cmd=avr-objcopy
 compiler.ldflags=
 compiler.libraries.ldflags=
 compiler.size.cmd=avr-size
+compiler.symbol.cmd=avr-nm
 
 # This can be overridden in boards.txt
 build.extra_flags=
@@ -72,6 +73,10 @@ recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" {compiler.c.elf.f
 recipe.objcopy.eep.pattern="{compiler.path}{compiler.objcopy.cmd}" {compiler.objcopy.eep.flags} {compiler.objcopy.eep.extra_flags} "{build.path}/{build.project_name}.elf" "{build.path}/{build.project_name}.eep"
 recipe.objcopy.hex.pattern="{compiler.path}{compiler.elf2hex.cmd}" {compiler.elf2hex.flags} {compiler.elf2hex.extra_flags} "{build.path}/{build.project_name}.elf" "{build.path}/{build.project_name}.hex"
 
+## Check for progmem overflow
+recipe.objcopy.progmem.pattern="/bin/bash" "{runtime.platform.path}/scripts/progmemcheck.sh" "{compiler.path}/{compiler.symbol.cmd}" "{build.path}/{build.project_name}.elf"
+recipe.objcopy.progmem.pattern.windows="{runtime.platform.path}/scripts/progmemcheck.bat" "{runtime.tools.avr-gcc.path}\\bin\\{compiler.symbol.cmd}" "{build.path}/{build.project_name}.elf"
+
 ## Save hex
 recipe.output.tmp_file={build.project_name}.hex
 recipe.output.save_file={build.project_name}.{build.variant}.hex

scripts/progmemcheck.bat

@@ -0,0 +1,53 @@
+@echo off
+REM Windows batch file equivalent of progmemcheck.sh
+REM Checks if PROGMEM section is too large (over 65535 bytes)
+REM Usage: progmemcheck.bat <objdump_tool> <object_file>
+
+if "%1"=="" goto usage
+if "%2"=="" goto usage
+
+REM Execute objdump command and extract the address (should be decimal with -t d option)
+for /f "tokens=1" %%i in ('%1 -t d %2 ^| findstr "__ctors_start"') do set progmem_end=%%i
+
+REM Check if we got a result
+if "%progmem_end%"=="" (
+    exit /b 0
+)
+
+REM Remove any leading/trailing spaces
+set progmem_end=%progmem_end: =%
+
+REM Remove leading zeros manually (batch treats leading zeros as octal)
+:strip_zeros
+if "%progmem_end:~0,1%"=="0" if not "%progmem_end%"=="0" (
+    set progmem_end=%progmem_end:~1%
+    goto strip_zeros
+)
+
+REM If we stripped all digits, it was "000..." so set to 0
+if "%progmem_end%"=="" set progmem_end=0
+
+REM Check if progmem_end is greater than 65535
+if %progmem_end% LEQ 65535 goto end
+
+REM Calculate the excess bytes
+set /a excess=%progmem_end% - 65535
+
+set line="^| Severe Warning: PROGMEM section too large by %excess% bytes.            "
+echo.
+echo _______________________________________________________________
+echo %line:~1,63%^|
+echo ^| Your program will most probably be unstable!                ^|
+echo ^| Use the macros PROGMEM_FAR from ^<progmem_far.h^> and         ^|
+echo ^| pgm_get_far_address/pgm_read_xxxx_far from ^<avr/pgmspace.h^>.^|
+echo ^|_____________________________________________________________^|
+echo.
+goto end
+
+:usage
+echo Usage: %0 ^<objdump_tool^> ^<object_file^>
+echo Example: %0 avr-objdump firmware.elf
+exit /b 1
+
+:end
+exit /b 0

scripts/progmemcheck.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+progmem_end=`$1 -t d $2 | grep __ctors_start | cut -d ' ' -f 1`
+if [ "x$progmem_end" != "x" ] && [ $progmem_end -gt 65535 ]; then
+    warning="| Severe Warning: PROGMEM section too large by $(expr $progmem_end - 65535) bytes.            "
+    echo "_______________________________________________________________"
+    echo "${warning:0:62}|"
+    echo "| Your program will most probably be unstable!                |"
+    echo "| Use the macros PROGMEM_FAR from <progmem_far.h> and         |"
+    echo "| pgm_get_far_address/pgm_read_xxxx_far from <avr/pgmspace.h>.|"
+    echo "|_____________________________________________________________|"
+fi