How to get cross CIF for building LiteOS¶

Instructions are for Ubuntu 18.04.

$ sudo apt-get install autoconf automake libtool libexpat1-dev libncurses5-dev bison flex patch texinfo build-essential gawk gperf help2man libtool-bin

Install CIF as usual. Below it is assumed that CIF sources and build files are within directory ~/cif.

Download the ZIP archive from https://github.com/stephanosio/crosstool-ng/tree/newlib_nano_variant to the home directory. At the moment of writing this document the corresponding pull request was not accepted yet. Extract the ZIP archive. After that go to directory ~/crosstool-ng-newlib_nano_variant and execute the following commands:
$ ./bootstrap
$ ./configure --enable-local
$ make

Build cross CIF
$ mkdir ~/cif/build/cross
Download file .config attached to this page into ~/cif/build/cross. Replace username "novikov" with your one if necessary within ~/cif/build/cross/.config.
$ ~/crosstool-ng-newlib_nano_variant/ct-ng build¶

Get and build LiteOS
$ git clone https://github.com/LiteOS/LiteOS.git
$ cd ~/LiteOS/targets/Cloud_STM32F429IGTx_FIRE/GCC
Perhaps you need to replace username "novikov" with your one.
$ export PATH=$PATH:/home/novikov/x-tools/arm-unknown-eabihf/bin
$ make¶