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.. _BUILD:llvm:
LLVM backend
############
.. rubric:: Requirements
* GCC (Gnu Compiler Collection)
* GNAT (Ada compiler for GCC)
* LLVM (Low-Level-Virtual Machine) and CLANG (Compiler front-end for LLVM): 3.5, 3.8, 3.9, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 or 10.0
.. _BUILD:llvm:GNAT:
GCC/GNAT: GNU/Linux or Windows (MinGW/MSYS2)
============================================
.. HINT:: You need to install LLVM (usually depends on ``libedit``, see :ghdlsharp:`29`). Debugging is only supported with LLVM 3.5.
GHDL is configured by ``configure`` and built by ``make``.
* First, GHDL needs to be configured. It is common to specify a ``PREFIX``
(installation directory like ``/usr/local`` or ``/opt/ghdl``). Set the proper
arg, ``./configure --with-llvm-config``, to select LLVM backend. If
``llvm-config`` is not in your path, you can specify it:
``./configure --with-llvm-config=LLVM_INSTALL/bin/llvm-config``.
* Next, ``make`` starts the compilation process.
* Finally, ``make install`` installs GHDL into the installation directory
specified by ``PREFIX``.
.. rubric:: Example:
.. code-block:: Bash
$ cd <ghdl>
$ mkdir build
$ cd build
$ ../configure --with-llvm-config --prefix=PREFIX
$ make
$ make install
.. HINT:: If you want to have stack backtraces on errors (like assert failure or index of out bounds), you need to configure and build ``libbacktrace`` from GCC (you don't need to configure GCC). Then add the following arg to configure: ``--with-backtrace-lib=/path-to-gcc-build/libbacktrace/.libs/libbacktrace.a``
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