178 lines
6.5 KiB
Plaintext
178 lines
6.5 KiB
Plaintext
This document contains instructions on how to cross-build the FreeType
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library on Unix systems, for example, building binaries for Linux/MIPS
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on FreeBSD/i386. Before reading this document, please consult the
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file `INSTALL.UNIX' for required tools and the basic self-building
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procedure.
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1. Required Tools
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-----------------
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For self-building the FreeType library on a Unix system, GNU Make
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3.81 or newer is required. `INSTALL.UNIX' contains hints how to
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check the installed `make'.
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The GNU C compiler to cross-build the target system is required.
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Currently, using a non-GNU cross compiler is untested. The cross
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compiler is expected to be installed with a system prefix. For
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example, if your building system is FreeBSD/i386 and the target
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system is Linux/MIPS, the cross compiler should be installed with
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the name `mips-ip22-linuxelf-gcc'.
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A C compiler for a self-build is required also, to build a tool
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(`apinames') that is executed during the build procedure. Non-GNU
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self compilers are acceptable, but such a setup is untested.
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2. Configuration
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----------------
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2.1. Building and target system
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To configure a cross-build, the options `--host=<system>' and
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`--build=<system>' must be passed to the `configure' script.
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For example, if your build system is FreeBSD/i386 and the target
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system is Linux/MIPS, say
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./configure \
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--build=i386-unknown-freebsd \
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--host=mips-ip22-linuxelf \
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[other options]
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It should be noted that `--host=<system>' specifies the system
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where the built binaries will be executed, not the system where
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the build actually happens. Older versions of GNU autoconf use
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the option pair `--host=' and `--target='. This is broken and
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doesn't work. Similarly, an explicit CC specification like
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env CC=mips-ip22-linux-gcc ./configure # BAD
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or
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env CC=/usr/local/mips-ip22-linux/bin/gcc ./configure # BAD
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doesn't work either; such a configuration confuses the
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`configure' script while trying to find the cross and native C
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compilers.
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2.2. The prefix to install FreeType2
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Setting `--prefix=<prefix>' properly is important. The prefix
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to install FreeType2 is written into the `freetype-config'
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script and `freetype2.pc' configuration file.
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If the built FreeType 2 library is used as a part of the
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cross-building system, the prefix is expected to be different
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from the self-building system. For example, a configuration
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with `--prefix=/usr/local' installs binaries into the
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system-wide `/usr/local' directory, which then can't be executed
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due to the incorrect architecture. This causes confusion in
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configuration of all applications that use FreeType2. Instead,
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use a prefix to install the cross-build into a separate system
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tree, for example, `--prefix=/usr/local/mips-ip22-linux/'.
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On the other hand, if the built FreeType 2 library is used as a
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part of the target system, the prefix to install should reflect
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the file system structure of the target system.
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2.3. Library dependencies
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FreeType normally depends on external libraries like `libpng' or
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`libharfbuzz'. The easiest case is to deactivate all such
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dependencies using the `--without-XXX' configuration options.
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However, if you want to use those libraries, you should ensure
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that they are available both on the target system and as
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(cross-compiled) libraries on the build system.
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FreeType uses `pkg-config' to find most of the libraries; the
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other libraries it links to are expected in the standard system
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directories. Since the default pkg-config's meta-information
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files (like `harfbuzz.pc') of the build platform don't work, use
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one of the two possible solutions below.
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o Use pkg-config's meta-information files that are adjusted to
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cross-compile and cross-link with the target platform's
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libraries. Make sure those files are found before the build
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system's default files. Example:
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./configure \
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--build=i386-unknown-freebsd \
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--host=mips-ip22-linuxelf \
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PKG_CONFIG_LIBDIR="/usr/local/mips-ip22-linux/lib/pkgconfig" \
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[other options]
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See the manpage of `pkg-config' for more details.
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o Set variables like LIBPNG_LIBS as additional options to the
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`configure' script, overriding the values `pkg-config' would
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provide. `configure --help' shows the available environment
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variables. Example:
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./configure \
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--build=i386-unknown-freebsd \
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--host=mips-ip22-linuxelf \
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LIBPNG_CFLAGS="-I/usr/local/mips-ip22-linux/include" \
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LIBPNG_LIBS="-L/usr/local/mips-ip22-linux/lib -lpng12" \
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[other options]
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3. Building command
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-------------------
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If the configuration finishes successfully, invoking GNU make
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builds FreeType2. Just say
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make
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or
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gmake
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depending on the name the GNU make binary actually has.
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4. Installation
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---------------
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Saying
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make install
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as usual to install FreeType2 into the directory tree specified by
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the argument of the `--prefix' option.
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As noted in section 2.2, FreeType2 is sometimes configured to be
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installed into the system directory of the target system, and
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should not be installed in the cross-building system. In such
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cases, the make variable `DESTDIR' is useful to change the root
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directory in the installation. For example, after
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make DESTDIR=/mnt/target_system_root/ install
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the built FreeType2 library files are installed into the directory
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`/mnt/target_system_root/<prefix_in_configure>/lib'.
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5. TODO
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-------
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Cross building between Cygwin (or MSys) and Unix must be tested.
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----------------------------------------------------------------------
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Copyright (C) 2006-2021 by
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suzuki toshiya, David Turner, Robert Wilhelm, and Werner Lemberg.
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This file is part of the FreeType project, and may only be used,
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modified, and distributed under the terms of the FreeType project
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license, LICENSE.TXT. By continuing to use, modify, or distribute
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this file you indicate that you have read the license and understand
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and accept it fully.
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--- end of INSTALL.CROSS ---
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