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* docs/INSTALL.CROSS: Revised and updated.

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2.6.5
Werner Lemberg 11 years ago
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      ChangeLog
  2. 92
      docs/INSTALL.CROSS

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ChangeLog
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@ -1,3 +1,7 @@
2014-03-01 Werner Lemberg <wl@gnu.org>
* docs/INSTALL.CROSS: Revised and updated.
2014-03-01 Werner Lemberg <wl@gnu.org>
Make `make clean' remove `freetype2.pc'.

92
docs/INSTALL.CROSS
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@ -1,26 +1,27 @@
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.
on FreeBSD/i386. Before reading this document, please consult the
file `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
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
Currently, using a non-GNU cross compiler is untested. 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
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.
(`apinames') that is executed during the build procedure. Non-GNU
self compilers are acceptable, but such a setup is untested.
2. Configuration
@ -28,10 +29,10 @@ INSTALL.UNIX for required tools and the basic self-building procedure.
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
To configure a cross-build, the options `--host=<system>' and
`--build=<system>' must be passed to the `configure' script.
For example, if your build system is FreeBSD/i386 and the target
system is Linux/MIPS, say
./configure \
--build=i386-unknown-freebsd \
@ -58,22 +59,63 @@ INSTALL.UNIX for required tools and the basic self-building procedure.
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.
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.
from the self-building system. For example, a configuration
with `--prefix=/usr/local' installs binaries into the
system-wide `/usr/local' directory, which then can't be executed
due to the incorrect architecture. This causes confusion in
configuration of all applications that 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 FreeType 2 library is used as a
part of the target system, the prefix to install should reflect
the file system structure of the target system.
2.3. Library dependencies
FreeType normally depends on external libraries like `libpng' or
`libharfbuzz'. The easiest case is to deactivate all such
dependencies using the `--without-XXX' configuration options.
However, if you want to use those libraries, you should ensure
that they are available both on the target system and as
(cross-compiled) libraries on the build system.
FreeType uses `pkg-config' to find most of the libraries; the
other libraries it links to are expected in the standard system
directories. Since the default pkg-config's meta-information
files (like `harfbuzz.pc') of the build platform don't work, use
one of the two possible solutions below.
o Use pkg-config's meta-information files that are adjusted to
cross-compile and cross-link with the target platform's
libraries. Make sure those files are found before the build
system's default files. Example:
./configure \
--build=i386-unknown-freebsd \
--host=mips-ip22-linuxelf \
PKG_CONFIG_LIBDIR="/usr/local/mips-ip22-linux/lib/pkgconfig" \
[other options]
See the manpage of `pkg-config' for more details.
o Set variables like LIBPNG_LIBS as additional options to the
`configure' script, overriding the values `pkg-config' would
provide. `configure --help' shows the available environment
variables. Example:
./configure \
--build=i386-unknown-freebsd \
--host=mips-ip22-linuxelf \
LIBPNG_CFLAGS="-I/usr/local/mips-ip22-linux/include" \
LIBPNG_LIBS="-L/usr/local/mips-ip22-linux/lib -lpng12" \
[other options]
3. Building command
@ -121,7 +163,7 @@ INSTALL.UNIX for required tools and the basic self-building procedure.
----------------------------------------------------------------------
Copyright 2006, 2008, 2012 by suzuki toshiya
Copyright 2006, 2008, 2012, 2014 by suzuki toshiya
David Turner, Robert Wilhelm, and Werner Lemberg.

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