Environment variables

Some environment variables are used to adjust the behaviour of the build system used in Contiki/Mulle

Environment variables used when building

• BUILD_WITH_CLANG - When set to 1: compiles the sources using Clang instead of GCC.
• MULLE_BOARD_SERIAL_NUMBER - Tells the build system which specific hardware revision to build for.
• PROGRAMMER_SERIAL - Which programmer board to use.
• PROGRAMMER_VERSION - Less specific than PROGRAMMER_SERIAL, only tell which version of the programmer board you are using, but still match any serial number (PROGRAMMER_SERIAL='*').
• CPU_PART - The specific CPU module used when linking, there must exist a linker script for this specific CPU part in the cpu/arm/k60/ldscripts/ directory.
• V - When set to 1: display all Makefile commands as they are executed, otherwise, display only simplified commands (e.g. CC contiki-main.c).
• DEBUG - CFLAGS extra parameters for debugging, default: -g3 -gdwarf-4, see GCC manual.
• OPTI - optimization level (-O*), default: 0, possible values: 0,1,2,3,4,s,fast, see GCC manual for details.

Environment variables affecting the debug/flash commands

Setup of debug commands:

• FFLAGS - flags passed to the flasher program command.
• DEBUGSERVER_FLAGS - flags passed to the debug server command.
• DEBUGGER_FLAGS - flags passed to the debugger command.
• RESET_FLAGS - flags passed to the reset command.
• TERMFLAGS - flags passed to the term command.
• OPENOCD - Alternative OpenOCD command, default: openocd
• DEBUGGER - Alternative debugger command, default: gdb
• DEBUGSERVER - Alternative debug server command, default: $(OPENOCD)
• FLASHER - Alternative flash command, default: $(OPENOCD)
• TERMPROG - Alternative term command, default: $(SERIALDUMP)
• FILENAME - Flash filename, default: same as project name (directory)
• GDB_PORT - GDB tcp port, default: 3333
• PORT - UART device, default: /dev/ttyUSB0

Toolchain paths etc.

You will only need to touch these variables if using some special toolchain.

• TARGET_TRIPLE - Target triple, i.e. the compiler CTARGET specification, default: arm-none-eabi
• TCPREFIX - Toolchain prefix, all compiler commands will be prefixed by this, default: $(TARGET_TRIPLE)-
• GDBPREFIX - same as toolchain prefix, but for GDB commands, default: $(TCPREFIX)
• GCCBIN legacy TCPREFIX equivalent, do not set this.