Revert the default DEBUG_LEVEL setting from 3 to 2, as this is apparently causing segfaults on some builds of binutils-avr.

Add DEBUG_FORMAT and DEBUG_LEVEL optional parameters to the BUILD module. Turn off generation of debug information when performing a validation build, and when running the build tests.

Rename build system module makefiles from "lufa.MODULE.in" to "lufa_MODULE.mk" to prevent makefile from assuming the include is an old style build rule, slowing down the build process.

Prevent the BUILD module from shell-executing multiple processes to determine the avr-size flags to speed up the build, unless the size rule is invoked.

Add warnings and set warnings as errors to the SingleUSBModeTest build test makefile.

Add check and error to the BUILD module if OBJDIR option is set but object filenames are not unique.

Update BUILD build system module with OBJECT_FILES variable, for additional user-specified object files. Update HID build module with a small shim application to reprogram the EEPROM of a target.

Make sure dependency files are generated for assembly files too in the BUILD build system module. Minor code cleanups.

Move out BUILD build system module start and end messages to the respective targets, as they are only used once.

Enable GCC's -pipe option by default, to build projects using intermediary logical OS pipes rather than temporary files on disk.

Minor build system improvements - move out AVRDUDE base flags into a makefile variable, clean up BUILD module.

Add ability to generate SYM files in the BUILD module. Clean up build system output to be slightly more human readable.

Add OBJDIR optional build variable to the BULD build system module, to allow the user project to relocate the output object and dependency files to a different directory.

Change the build system build module makefiles to have a set of sanity check macros they can call to verify user data. Add additional sanity checks.

Fix BUILD module so that user flags are applied after all auto-generated flags, ensure dependency files are generated with a .d extension rather than a .o.d extension, allow use of full part names ("at32uc3a0256") instead of GCC truncted part names ("uc3a0256").

Add new ATPROGRAM build system module. Add ATPROGRAM and CPPCHECK modules to all application makefiles.

Add symbol-sizes target to the BUILD build system module to print a size-sorted list of symbols from a compiled application, in decimal bytes.

Don't show a list of object/dependency files in the human friendly output of the BUILD module clean command. Use a unique message prefix for assembling vs. compiling.

Add explicit blank checks in the build system for user-set but blank variables that must not be blank.

Add .PHONY targets in all build system modules. Alter BUILD module so that the existence of source files are checked before the build is started.

Add $(MAKEFILE_LIST) as a dependency on build rules that could be altered by changes to the makefiles - if the user alters the project makefile, require that all modules are rebuilt.

Clean up CORE build system module, use simple rather than recursive make variables for internal constants and $(shell) derived values.

Clean up BUILD build system module - seperate architecture utility prefix code and sanity check from the CC_FLAGS construction code. Add target to print GCC version.

Remove any variables in the optional build variable list that are marked as mandatory by one or more included build system modules in the CORE build system module. Alter DOXYGEN build system module to by default override the Doxygen configuration file stylesheet and replace it with the LUFA Doxygen stylesheet.

Ensure build tests use the system provided $(MAKE) variable to determine the command to invoke make, rather than a hard-coded name. Strip off excess whitespace from the list of object files when printing them out to the shell in the build system BUILD module.

Ensure the BULD build system module produces a LSS listing file output when the "all" target is invoked.

Strip trailing slash from the user-supplied LUFA_PATH directory, to prevent double slashes from appearing in the commands/output.

Add EEPROM programming target to the AVRDUDE build system module. Correct message output test for the BUILD build system module. Clean up DOXYGEN build system module logic.