Step by step tutorial on how to use PARI/GP development version in Sage

This tutorial explains how to use a PARI/GP development version inside Sage. This is currently a bit hackish and the aim is to have this possibility natively supported (see this thread on sage-devel.

Prerequisites

1. We assume that your PARI/GP source code is at $PARI_ROOT

2. You need version of Sage compiled from source that is run with the command sage

Procedure

1. Download the script pari_sage.sh

2. Start Sage environment

   $ cd $PARI_ROOT
   $ sage -sh                # starts Sage environment

3. Optional step: apply Sage patches located in $SAGE_ROOT/build/pkg/pari/patches.

4. Compile pari

   $ cd $PARI_ROOT
   $ make clean              # start with a clean slate
   $ source pari_sage.sh     # reading pari_build.sh
   $ pari_set_environment    # setting properly environment variables for compilation
   $ pari_build              # building pari
   $ pari_install            # installing pari

5. Recompile cysignals

   $ sage -f cysignals       # recompile cysignals (to be linked correctly against pari)

6. Compile the last version of cypari (this currently breaks, but this pull request fixes it)

   $ sage -pip install git+https://github.com/defeo/cypari2

7. Recompile what needs to be

   $ sage -br

Procedure to restore the standard PARI package in Sage

1. $ sage -f pari
   $ sage -f cysignals
   $ sage -f cypari
   $ sage -br