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This is the Thumb2 Newlib Toolchain project providing a script to compile the latest GCC with Newlib and optimizations for microcontrollers. So far it only has been tested on OSX, Debian and NetBSD, feel free to push changes for your OS. Usage is quite simple: Execute "./toolchain.sh" to build toolchain Execute "./toolchain.sh clean" to remove build artefacts Check script header for configuration options 02/10/2017 - GCC 6.3, Newlib 2.5.0 etc. New option to enable Newlib instrumentation. 02/29/2016 - GCC 5.3 and Newlib 2.3.0 as well as compilation with debug symbols. 09/18/2015 - GCC 5.2 and the latest Newlib 2.2.0 03/19/2014 - The latest everything. GCC 4.9 (snapshot), Newlib 2.1.0 (nano-malloc) and more! 08/24/2013 - Additional optimization option preferring speed over size 01/24/2013 - Replaced newlib with newlib-nano, the newlib option is still in the build script. 06/05/2012 - TNT has been updated to the latest Linaro GCC 4.7 06/22/2012 - Switched to a GCC 4.8 snapshot and disabled LTO for newlib due to regressions 08/29/2012 - Switched to the latest Linaro GCC for minor size improvements, also configured newlib with "reent-small" for 800byte savings in .data 09/10/2012 - Multilib support for several thumb targets: armv6s-m (cortex-m0/cortex-m1) armv7-m (cortex-m3) armv7e-m (cortex-m4/cortex-m4f including FPU and DSP instruction support)