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Due to our use of "libtool" to generate and install the FreeType 2
libraries on Unix systems, as well as other historical events, it is
generally very difficult to know precisely which release of the font
engine is installed on a given system.
This file tries to explain why and to document ways to properly detect
FreeType on Unix.
1. Version & Release numbers
----------------------------
For each new public release of FreeType 2, there are generally *three*
distinct "version" numbers to consider:
* The official FT2 release number, like 2.0.9, or 2.1.3.
* The libtool (and Unix) specific version number, like "9.2.3". This
is what "freetype-config --version" will return.
* The platform-specific shared object number, used for example when
the library is installed as "/usr/lib/libfreetype.so.6.3.2".
The platform-specific number is, unsurprisingly, platform-specific and
varies with the operating system you are using (several variants of
Linux, FreeBSD, Solaris, etc.). You should thus _never_ use it, even
for simple tests.
The libtool-specific number does not equal the release number but is
tied to it.
The release number is available at *compile* time through the following
macros defined in FT_FREETYPE_H:
- FREETYPE_MAJOR : major release number
- FREETYPE_MINOR : minor release number
- FREETYPE_PATCH : patch release number
See below for a small autoconf fragment.
The release number is also available at *runtime* through the
"FT_Library_Version" API. Unfortunately, this one wasn't available or
working correctly before the 2.1.3 official release.
2. History
----------
The following table gives, for each official release, the corresponding
libtool number, as well as the shared object number found on _most_
systems, but not all of them:
release libtool so
-------------------------------
2.2.0 9.9.3 6.3.9
2.1.10 9.8.3 6.3.8
2.1.9 9.7.3 6.3.7
2.1.8 9.6.3 6.3.6
2.1.7 9.5.3 6.3.5
2.1.6 9.5.3 6.3.5
2.1.5 9.4.3 6.3.4
2.1.4 9.3.3 6.3.3
2.1.3 9.2.3 6.3.2
2.1.2 9.1.3 6.3.1
2.1.1 9.0.3 ?
2.1.0 8.0.2 ?
2.0.9 9.0.3 ?
2.0.8 8.0.2 ?
2.0.4 7.0.1 ?
2.0.1 6.1.0 ?
The libtool numbers are a bit inconsistent due to the library's history:
- 2.1.0 was created as a development branch from 2.0.8 (hence the same
libtool numbers).
- 2.0.9 was a bug-fix release of the "stable" branch, and we
incorrectly increased its libtool number.
- 2.1.4 is still in the "development" branch, however it is stable
enough to be the basis of an upcoming 2.2.0 release.
3. Autoconf Code Fragment
-------------------------
Lars Clausen contributed the following autoconf fragment to detect which
version of FreeType is installed on a system. This one tests for a
version that is at least 2.0.9; you should change it to check against
other release numbers.
AC_MSG_CHECKING([whether FreeType version is 2.0.9 or higher])
old_CPPFLAGS="$CPPFLAGS"
CPPFLAGS=`freetype-config --cflags`
AC_TRY_CPP([
#include <ft2build.h>
#include FT_FREETYPE_H
#if (FREETYPE_MAJOR*1000 + FREETYPE_MINOR)*1000 + FREETYPE_PATCH < 2000009
#error Freetype version too low.
#endif
],
[AC_MSG_RESULT(yes)
FREETYPE_LIBS=`freetype-config --libs`
AC_SUBST(FREETYPE_LIBS)
AC_DEFINE(HAVE_FREETYPE,1,[Define if you have the FreeType2 library])
CPPFLAGS="$old_CPPFLAGS"],
[AC_MSG_ERROR([Need FreeType library version 2.0.9 or higher])])
------------------------------------------------------------------------
Copyright 2002, 2003, 2004, 2005 by
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 VERSION.DLL ---
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