• Setting up prerequisites
• Building JerryScript
• Checking patch
  • Running only one type of test

Setting up prerequisites

Currently, only Ubuntu 18.04+ is officially supported as primary development environment.
There are several dependencies, that should be installed manually. The following list is the absolute minimum for building:
* gcc or any C99-compliant compiler (native or cross, e.g., arm-none-eabi)
* cmake >= 2.8.12.2

Several scripts and tools help the building and development process, thus it is recommended to have the following installed as well:
* bash >= 4.3.11
* cppcheck >= 1.61
* vera++ >= 1.2.1
* python >= 2.7.6

  1. sudo apt-get install gcc gcc-arm-none-eabi cmake cppcheck vera++ python

To make our scripts run correctly, several shell utilities should be available on the system:
* awk
* bc
* find
* sed

Building JerryScript

To build debug version for Linux
1. python tools/build.py --debug

To build debug version for Linux without LTO (Link Time Optimization)
1. python tools/build.py --debug --lto=off

To enable more verbose outputs for debugging
1. tools/build.py --debug --logging=on --error-messages=on --line-info=on

Add custom arguments to CMake
1. python tools/build.py --cmake-param=CMAKE_PARAM

Set a profile mode (ES.next, ES5.1, minimal)
1. python tools/build.py --profile=es.next|es5.1|minimal

See also the related README.md.
Use (compiler-default, external) libc
The default libc is the compiler-default libc but you can use an external libc as well:
* compiler-default libc:

  1. python tools/build.py

• external libc:

  1. python tools/build.py --compile-flag="-nostdlib -I/path/to/ext-libc/include" --link-lib="ext-c"

Add toolchain file
The cmake dir already contains some usable toolchain files, which you can use in the following format:
1. python tools/build.py --toolchain=TOOLCHAIN

For example the cross-compile to RaspberryPi 2 is something like this:
1. python tools/build.py --toolchain=cmake/toolchain_linux_armv7l.cmake

Use system memory allocator
1. python tools/build.py --system-allocator=on

Note : System allocator is only supported on 32 bit systems.
Enable 32bit compressed pointers
1. python tools/build.py --cpointer-32bit=on

Note : There is no compression/decompression on 32 bit systems, if enabled.
Change default heap size (512K)
1. python tools/build.py --mem-heap=256

If you would like to use more than 512K, then you must enable the 32 bit compressed pointers.
1. python tools/build.py --cpointer-32bit=on --mem-heap=1024

Note : The heap size will be allocated statically at compile time, when JerryScript memory allocator is used.
To build with libfuzzer support
1. CC=clang python tools/build.py --libfuzzer=on --compile-flag=-fsanitize=address --lto=off

Check the documentation of libfuzzer to get the runtime settings of the created fuzzer binary: https://llvm.org/docs/LibFuzzer.html.
To get a list of all the available buildoptions for Linux
1. python tools/build.py --help

Checking patch

  1. python tools/run-tests.py --precommit

Running only one type of test

To run build option tests
1. python tools/run-tests.py --buildoption-test

To run unittests
1. python tools/run-tests.py --unittests

To run jerry-tests
1. python tools/run-tests.py --jerry-tests

To run signed-off check
1. python tools/run-tests.py --check-signed-off

To run cppcheck
1. python tools/run-tests.py --check-cppcheck

To run vera check
1. python tools/run-tests.py --check-vera

To get a list of all the available test options
1. python tools/run-tests.py --help