build ghdl from source on Linux

Instructions for building GHDL (version 0.34dev) with GCC4.9.2 on Linux

Prerequisites

You will need the following tools installed on your computer:

gcc (the c compiler)
g++ (the c++ compiler)
gnat (the Ada compiler)
make (build tool)
and various other tools normally installed on Linux systems. Full list at http://gcc.gnu.org/install/prerequisites.html

On newer Debian systems (including Jessie) installing gcc-multilib should eliminate build failures caused by multilibs. On older systems you may need the "export LIBRARY_PATH" setting described in step 7 below.

Ideally gcc, gnat and g++ are the same version, 4.9 have been used successfully.

Procedure

2) 1) Download gcc-4.9.2.tar.bz2 from ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/releases/gcc-4.9.2/
(or other mirror listed on http://gcc.gnu.org/mirrors.html) and untar it into "source" - there should now be a
"source/gcc-4.9.2" folder.

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2) Load the prerequisites for building GCC. GCC now provides a script to do this:

cd source/gcc-4.9.2
./contrib/download_prerequisites
cd ..

(leaving you in the "source" folder)

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3) Acquire the GHDL source from the Mercurial repository, or by downloading the package (TODO)

hg clone http://hg.code.sf.net/p/ghdl-updates/code ghdl

Select the branch you want to build (e.g. either the current stable version or the latest)

cd ghdl
hg update

(or just "hg update -r ghdl-0.33" for the latest release)

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4) Follow the instructions in source/ghdl/README