Making a C++ program with the Giac library

• Windows: The easiest supported install for Windows is: get CodeBlocks 32 bits, install it, get mingw giac 32 bits, unzip it in your CodeBlocks/MinGW directory then you can link a console project with giac by adding in Settings Compiler, Linker settings in the libraries giacdll. Or adapt this example.
  If you are compiling with cygwin, the dll is installed by the Xcas installer. If you are compiling with an other compiler, you should use these DLL: win32 dll, win64 dll
• Mac: install Xcas for Mac, libraries and headers are installed in /Applications/usr/, then run File, Create Links from Xcas to create links in /usr/local
  Or compile with -I/Applications/usr/include and link with -L/Applications/usr/lib (may require export LD_LIBRARY_PATH=/Applications/usr/lib at runtime)
• iOS: iphone ARM7 and x86 simulator giac libraries and headers for mac os x.6, compiled with version 0.39 of libtommath. For arm64, the easiest is probably to copy the giac source files and tommath in your project, copy config.h.iphone to config.h, and modify for 64 bits.
• Linux: The easiest way if you have a Debian-based distribution (debian, ubuntu, ...) is to install the giac debian package if your distribution is supported or follow the quick debian/ubuntu install below. On other distributions, you will have to compile giac from source.

Compiling Giac from source

• Stable source You can get the latest stable source or browse the directory of sources for a specific version number. These sources should compile with gcc from version 3.4.
• Latest evolving source (version) Available here (HTTP) or from Geogebra GIT.
• QT windows: See this blog by Zoltán Kovács, from the Geogebra dev team
• SageMath users: Frederic Han's giac bindings are now part of sage. Just install the linux package of giac and install sage, then giac(something) will convert from sage to giac. For more information see Frederic Han page

• Quick ubuntu/debian install
  • sudo apt-get install gcc g++ libgmp-dev libmpfr-dev libmpfi-dev libpari-dev libgsl0-dev libxext-dev libpng-dev libjpeg-dev libreadline-dev libncurses5-dev mesa-common-dev libx11-dev libxt-dev libxft-dev libntl-dev libgl1-mesa-dev libgl-dev libao-dev hevea debhelper libecm1-dev libnauty2-dev libcliquer-dev libresample1-dev libxinerama-dev libsamplerate0-dev libfltk1.3-dev (N.B.: libpari-dev is sometimes named libpari1-dev). Install libfltk1.3-dev (with sudo apt-get install) or compile FLTK (see below).
  • Optionnaly install more up-to-date versions of the softwares below
  • Run ./mkdebian from giac directory.
• Installing the required and optional libraries
  • GMP (required), or get it on your distribution (apt-get install libgmp-dev on Debian)
  • MPFR (highly recommended), or get it on your distribution (apt-get install libmpfr-dev on Debian)
  • NTL (recommended). Untar, cd src and compile with
    ./configure NTL_GMP_LIP=on NTL_STD_CXX=on
    make && make install
  • PARI 2.x (recommended),
  • GSL (recommended), or get it on your distribution (apt-get install libgsl0-dev on Debian)
  • FLTK (required), you need FLTK 1.3.2 (sudo apt-get install libfltk1.3-dev) or compile this patched 1.3 version.
  • vectorclass (optionnal) by Agner Fog, run export CXXFLAGS='-O2 -g -mfma -mavx2 -fabi-version=0' before ./configure
• Compiling GIAC
  Once you have installed all the required libraries, to compile giac type
  • tar xvfz giac_unstable.tgz
    (or tar xvfz giac_stable.tgz)
  • cd giac-1.9.0
    (or cd giac-a.b.c)
  • sh configure
  • make
  • su
  • make install