cmake toolchain for AVR
CMake C++ C
Latest commit a26af66 Jan 6, 2017 @mkleemann committed on GitHub Merge pull request #8 from petrockblog/master
Added support for Crosspack for AVR

cmake-avr - a cmake toolchain for AVR projects

Testing the example provided

The toolchain was created and tested within the following environment:


  • Arch Linux with kernel 3.12.5-1-ARCH up to 3.16.2-1-ARCH
  • cmake version - 3.0.2
  • GNU Make 4.0
  • avr-gcc (GCC) 4.8.2 - 4.9.1
  • avr-binutils 2.23.2-1 - 2.24-2
  • avr-libc 1.8.0-5 - 1.8.1-1
  • git version - 2.1.0

Windows XP

  • cmake version
  • GNU Make 3.81
  • avr-gcc (AVR_8_bit_GNU_Toolchain_3.4.1_798) 4.6.2 (Atmel Studio 6)
  • avr-binutils AVR_8_bit_GNU_Toolchain_3.4.1_798 (Atmel Studio 6)
  • avr-libc AVR_8_bit_GNU_Toolchain_3.4.1_798 (Atmel Studio 6)
  • git version 1.7.11.msysgit.1

Windows 7

  • cmake 3.0.2
  • Atmel Studio 6.2
  • git 1.9.0.msysgit


  • OS X 10.10 with AVR toolchain installed from macports
  • cmake 3.0.2
  • GNU Make 3.81
  • avr-gcc 4.9.1
  • avr-libc 1.8.1
  • avr-binutils 2.24_1
  • git version 2.1.2

Note: If building in a Windows environment, you need to extent the values of the environment variable PATH to the location of the binaries, especially to find make. To enable a more general approach to different Windows toolchains, the variable AVR_FIND_ROOT_PATH needs to be defined. Tested was it with the following setup (XP):

PATH=...;d:/Program Files/Atmel/Atmel Studio 6.0/extensions/Atmel/AVRGCC/;...
AVR_FIND_ROOT_PATH="d:/Program Files/Atmel/Atmel Studio 6.0/extensions/Atmel/AVRGCC/"

Issue within Windows 7 environment With Windows 7 (64bit) and the Atmel Studio 6.2 setup, make.exe now resides differently. It also crashes during the cmake generation process, just after the simple examples to test the compiler (try_compile(...)) ran through. The why and avoidance of this is currently unknown to me. I didn't try to use a cygwin make as a substitute yet.

After getting the project

git clone /path/to/clone/in

you just need to run the following commands

mkdir -p /path/to/some/build/dir
cd /path/to/some/build/dir
cmake -DCMAKE_TOOLCHAIN_FILE=/path/to/clone/in/generic-gcc-avr.cmake /path/to/clone/in/example

For Windows use:

cmake -G "Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=/path/to/clone/in/generic-gcc-avr.cmake /path/to/clone/in/example

This just creates the example, but does not upload it. For all possible targets, you need to run

make help

after running the cmake command.


  • option for target name attachments with MCU type (option -DWITH_MCU=ON (default))
  • usage of target names w/o extension for avr_target_link_libraries command
  • cleanup baudrate and other AVRDUDE settings
  • test in Windows environment
  • use add_definition() instead of variables for compiler settings
  • some more tests with upload and fuses