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.. _BUILD:gcc:
GCC backend
###########
.. TODO :: Instructions to build GHDL with GCC backend on Windows are not available yet.
.. rubric:: Requirements
* GCC (Gnu Compiler Collection)
* GNAT (Ada compiler for GCC)
* GCC source files. Download and untar the sources of version 4.9.x, 5.x, 6.x, 7.x, 8.x, 9.x or 10.x.
.. HINT :: There are some dependencies for building GCC (``gmp``, ``mpfr`` and ``mpc``). If you have not installed them on your system, you can either build them manually or use the ``download_prerequisites`` script provided in the GCC source tree (recommended): ``cd /path/to/gcc/source/dir && ./contrib/download_prerequisites``.
* First configure GHDL, specify GCC source directory and installation prefix (like ``/usr/local`` or ``/opt/ghdl``).
* Next, invoke ``make copy-sources`` to copy GHDL sources in the source directory.
* Then, configure GCC. The list of ``--disable`` configure options can be adjusted to your needs. GHDL does not require all these optional libraries and disabling them will speed up the build.
* Now, build and install GCC with ``make``.
* Last, build and install GHDL libraries.
.. rubric:: Example:
.. code-block:: Bash
$ cd <ghdl>
$ mkdir build
$ cd build
$ ../configure --with-gcc=/path/to/gcc/source/dir --prefix=/usr/local
$ make copy-sources
$ mkdir gcc-objs; cd gcc-objs
$ /path/to/gcc/source/dir/configure --prefix=/usr/local --enable-languages=c,vhdl \
--disable-bootstrap --disable-lto --disable-multilib --disable-libssp \
--disable-libgomp --disable-libquadmath
$ make -j2 && make install
$ cd /path/to/ghdl/source/dir/build
$ make ghdllib
$ make install
.. HINT :: Note that the prefix directory to configure ``gcc`` must be the same as the one used to configure GHDL. If you have manually built ``gmp``/``mpfr``/``mpc`` (without using the script in ``contrib``), and, if you have installed them in a non-standard directory, you may need to add ``--with-gmp=GMP_INSTALL_DIR``.
.. HINT :: If your system gcc was configured with ``--enable-default-pie`` (check if that option appears in the output of ``gcc -v``), you should also add it.
.. HINT :: If you don't want to install ``makeinfo``, do ``make install MAKEINFO=true`` instead.
.. HINT :: Once GCC (with GHDL) has been built once, it is possible to work on the GHDL source tree without copying it in the GCC tree. Commands are::
$ make ghdl1-gcc # Build the compiler
$ make ghdl_gcc # Build the driver
$ make libs.vhdl.local_gcc # Compile the vhdl libraries
$ make grt-all # Build the GHDL runtime
$ make install.vpi.local # Locally install vpi files
In ``src/ortho/gcc``, create a ``Makefile.conf`` file that sets the following
variables:
.. CODE:: Bash
AGCC_GCCSRC_DIR=/path/to/gcc/sources
AGCC_GCCOBJ_DIR=/path/to/gcc/build
If your system gcc was built with ``--enable-default-pie``, add
``-no-pie`` option for linking.
.. HINT :: For ppc64/ppc64le platform, the object file format contains an identifier for the source language. Because gcc doesn't know about VHDL, gcc crashes very early. This could be fixed with a very simple change in ``gcc/config/rs6000/rs6000.c`` (``gcc/config/rs6000/rs6000-logue.c`` since gcc 10), function ``rs6000_output_function_epilogue``:
.. CODE:: diff
|| ! strcmp (language_string, "GNU GIMPLE")
|| ! strcmp (language_string, "GNU Go")
|| ! strcmp (language_string, "GNU D")
- || ! strcmp (language_string, "libgccjit"))
+ || ! strcmp (language_string, "libgccjit")
+ || ! strcmp (language_string, "vhdl"))
i = 0;
|
