ref: 44aa7e0af52e44ccf87e62dc38dddc82af3255d7
dir: /docs/INSTALL.CROSS/
This document contains instructions on how to cross-build the FreeType
library on Unix systems, for example, building binaries for Linux/MIPS
on FreeBSD/i386. Before reading this document, please consult
INSTALL.UNIX for required tools and the basic self-building procedure.
1. Required Tools
-----------------
For self-building the FreeType library on a Unix system, GNU Make
3.80 or newer is required. INSTALL.UNIX contains hints how to
check the installed `make'.
The GNU C compiler to cross-build the target system is required.
At present, using non-GNU cross compiler is not tested. The cross
compiler is expected to be installed with a system prefix. For
example, if your building system is FreeBSD/i386 and the target
system is Linux/MIPS, the cross compiler should be installed with
the name `mips-ip22-linuxelf-gcc'.
A C compiler for a self-build is required also, to build a tool
that is executed during the building procedure. Non-GNU self
compilers are acceptable, but such a setup is not tested yet.
2. Configuration
----------------
2.1. Building and target system
To configure for cross-build, the options `--host=<system>' and
`--build=<system>' must be passed to configure. For example, if
your building system is FreeBSD/i386 and the target system is
Linux/MIPS, say
./configure \
--build=i386-unknown-freebsd \
--host=mips-ip22-linuxelf \
[other options]
It should be noted that `--host=<system>' specifies the system
where the built binaries will be executed, not the system where
the build actually happens. Older versions of GNU autoconf use
the option pair `--host=' and `--target='. This is broken and
doesn't work. Similarly, an explicit CC specification like
env CC=mips-ip22-linux-gcc ./configure # BAD
or
env CC=/usr/local/mips-ip22-linux/bin/gcc ./configure # BAD
doesn't work either; such a configuration confuses the
`configure' script while trying to find the cross and native C
compilers.
2.2. The prefix to install FreeType2
Setting `--prefix=<prefix>' properly is important. The prefix
to install FreeType2 is written into the freetype-config script
and freetype2.pc configuration file.
If the built FreeType 2 library is used as a part of the
cross-building system, the prefix is expected to be different
from the self-building system. For example, configuration with
`--prefix=/usr/local' installs binaries into the system wide
`/usr/local' directory which then can't be executed. This
causes confusion in configuration of all applications which use
FreeType2. Instead, use a prefix to install the cross-build
into a separate system tree, for example,
`--prefix=/usr/local/mips-ip22-linux/'.
On the other hand, if the built FreeType2 is used as a part of
the target system, the prefix to install should reflect the file
system structure of the target system.
3. Building command
-------------------
If the configuration finishes successfully, invoking GNU make
builds FreeType2. Just say
make
or
gmake
depending on the name the GNU make binary actually has.
4. Installation
---------------
Saying
make install
as usual to install FreeType2 into the directory tree specified by
the argument of the `--prefix' option.
As noted in section 2.2, FreeType2 is sometimes configured to be
installed into the system directory of the target system, and
should not be installed in the cross-building system. In such
cases, the make variable `DESTDIR' is useful to change the root
directory in the installation. For example, after
make DESTDIR=/mnt/target_system_root/ install
the built FreeType2 library files are installed into the directory
`/mnt/target_system_root/<prefix_in_configure>/lib'.
5. TODO
-------
Cross building between Cygwin (or MSys) and Unix must be tested.
----------------------------------------------------------------------
Copyright 2006, 2008, 2012 by suzuki toshiya
David Turner, Robert Wilhelm, and Werner Lemberg.
This file is part of the FreeType project, and may only be used,
modified, and distributed under the terms of the FreeType project
license, LICENSE.TXT. By continuing to use, modify, or distribute
this file you indicate that you have read the license and understand
and accept it fully.
--- end of INSTALL.CROSS ---