/compilers

Parsing & AST-tree & JIT

Primary LanguageC

Compilers analysis

How to setup libgccjit

  1. First you need to do is update system packages.

    sudo apt update && sudo apt upgrade

    Note: If after installation/updating you see something like this

    Errors were encountered while processing:
    udev 
    systemd-services
    libpam-systemd:amd64
    initramfs-tools

    you need to do following steps and retry installation/updating.

    cd /usr/sbin/
sudo emacs policy-rc.d
    • Write the following and save.
    #!/bin/sh
exit 101
    • Then
    sudo chmod +x policy-rc.d
sudo dpkg-divert --local --rename --add /sbin/initctl
sudo ln -s /bin/true /sbin/initctl // Ignore error if it is.

  2. Install libgccjit library.

    sudo apt install libgccjit-5-dev

  3. Before compilation you need to find out where libgccjit.h and libgccjit.so are. It can be done like this:

    find / -name 'libgccjit*'

    These paths should look something like this:

    /usr/lib/gcc/x86_64-linux-gnu/5/include/ - for libgccjit.h

    /usr/lib/gcc/x86_64-linux-gnu/5/ - for libgccjit.so

  4. Compilation. You can do it in two ways:

    a) Compile using -I and -L flags.

    gcc hello.c -o hello -lgccjit -I/usr/lib/gcc/x86_64-linux-gnu/5/include/ -L/usr/lib/gcc/x86_64-linux-gnu/5/ (altering these paths to found paths)

    b) Change global variables (you can add it to .bash-aliases).

    export CPATH=$CPATH:/usr/lib/gcc/x86_64-linux-gnu/5/include/
export LIBRARY_PATH=$LIBRARY_PATH:/usr/lib/gcc/x86_64-linux-gnu/5/

    And compile without paths specification.

    gcc hello.c -o hello -lgccjit

  5. Before running binary you need to specify crtbeginS.o location. You can do it like in the previous step.

    find / -name 'crtbeginS*'

    It should look something like this: /usr/lib/gcc/x86_64-linux-gnu/5/

    Add it to the LIBRARY_PATH:

    export LIBRARY_PATH=$LIBRARY_PATH:/usr/lib/gcc/x86_64-linux-gnu/5/

  6. Now you can run it.

    ./hello

How to run GNU Lightning

sudo ./configure
sudo make install
  • gcc -o example.c -llightning
  • Change LD_LIBRARY_PATH
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:~/[path to workspace]/lightning-2.1.2/lib/.libs/
export LD_LIBRARY_PATH
  • Now you can execute it ./example