Building 32-bit PHP on 64-bit Fedora
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:date:      2023-07-14 05:17:00 +0300
:category:  Linux
:tags:      php, cross-compilation

This is a short howto for people who already know how to compile PHP.

TL;DR:

.. code-block:: sh

    CFLAGS='-m32' PKG_CONFIG_PATH=/usr/lib/pkgconfig ./configure --host=i886 --prefix=$HOME/Software/php32 --exec-prefix=$HOME/Software/php32 --with-gmp --enable-mbstring
    make && make install

.. TEASER_END

.. note:: See https://www.php.net/manual/en/install.unix.php first

64 bit GCC is good enough for the task, it only needs a bit of help.

* ``CFLAGS='-m32'``. We need to tell the compiler that we're building a 32-bit app
* ``PKG_CONFIG_PATH=/usr/lib/pkgconfig`` ... and using 32-bit libraries
* ``./configure``. configure
* ``--host=i886``. Any 32 bit host will do here
* ``--prefix=$HOME/Software/php32``.
  Please so not make install into the real system paths!
  I use ``Software`` directory in my home to host anything custom built.
* ``--exec-prefix=$HOME/Software/php32``.
  Same but for executables.
* ``--with-gmp --enable-mbstring``.
  Configuring PHP as you like.
  See ``./configure --help`` for the list of params.