forked from minhngoc25a/freetype2
129 lines
4.2 KiB
Plaintext
129 lines
4.2 KiB
Plaintext
Due to our use of `libtool' to generate and install the FreeType 2
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libraries on Unix systems, as well as other historical events, it is
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generally very difficult to know precisely which release of the font
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engine is installed on a given system.
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This file tries to explain why and to document ways to properly detect
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FreeType on Unix.
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1. Version and Release numbers
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------------------------------
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For each new public release of FreeType 2, there are generally *three*
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distinct `version' numbers to consider:
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* The official FreeType 2 release number, like 2.0.9 or 2.1.3.
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* The libtool (and Unix) specific version number, like 9.2.3. This is
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what `freetype-config --version' returns.
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* The platform-specific shared object number, used for example when
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the library is installed as `/usr/lib/libfreetype.so.6.3.2'.
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The platform-specific number is, unsurprisingly, platform-specific and
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varies with the operating system you are using (several variants of
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Linux, FreeBSD, Solaris, etc.). You should thus _never_ use it, even
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for simple tests.
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The libtool-specific number does not equal the release number but is
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tied to it.
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The release number is available at *compile* time through the following
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macros defined in FT_FREETYPE_H:
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- FREETYPE_MAJOR: major release number
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- FREETYPE_MINOR: minor release number
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- FREETYPE_PATCH: patch release number
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See below for a small autoconf fragment.
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The release number is also available at *runtime* through the
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`FT_Library_Version' API. Unfortunately, this one wasn't available or
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working correctly before the 2.1.3 official release.
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2. History
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----------
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The following table gives, for each official release, the corresponding
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libtool number, as well as the shared object number found on _most_
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systems, but not all of them:
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release libtool so
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-------------------------------
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2.3.2 9.13.3 6.3.13
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2.3.1 9.12.3 6.3.12
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2.3.0 9.11.3 6.3.11
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2.2.1 9.10.3 6.3.10
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2.2.0 9.9.3 6.3.9
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2.1.10 9.8.3 6.3.8
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2.1.9 9.7.3 6.3.7
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2.1.8 9.6.3 6.3.6
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2.1.7 9.5.3 6.3.5
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2.1.6 9.5.3 6.3.5
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2.1.5 9.4.3 6.3.4
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2.1.4 9.3.3 6.3.3
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2.1.3 9.2.3 6.3.2
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2.1.2 9.1.3 6.3.1
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2.1.1 9.0.3 ?
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2.1.0 8.0.2 ?
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2.0.9 9.0.3 ?
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2.0.8 8.0.2 ?
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2.0.4 7.0.1 ?
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2.0.1 6.1.0 ?
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The libtool numbers are a bit inconsistent due to the library's history:
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- 2.1.0 was created as a development branch from 2.0.8 (hence the same
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libtool numbers).
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- 2.0.9 was a bug-fix release of the `stable' branch, and we
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incorrectly increased its libtool number.
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- 2.1.4 was a development version, however it was stable enough to be
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the basis of the 2.2.0 release.
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3. Autoconf Code Fragment
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-------------------------
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Lars Clausen contributed the following autoconf fragment to detect which
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version of FreeType is installed on a system. This one tests for a
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version that is at least 2.0.9; you should change it to check against
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other release numbers.
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AC_MSG_CHECKING([whether FreeType version is 2.0.9 or higher])
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old_CPPFLAGS="$CPPFLAGS"
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CPPFLAGS=`freetype-config --cflags`
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AC_TRY_CPP([
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#if (FREETYPE_MAJOR*1000 + FREETYPE_MINOR)*1000 + FREETYPE_PATCH < 2000009
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#error Freetype version too low.
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#endif
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],
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[AC_MSG_RESULT(yes)
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FREETYPE_LIBS=`freetype-config --libs`
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AC_SUBST(FREETYPE_LIBS)
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AC_DEFINE(HAVE_FREETYPE,1,[Define if you have the FreeType2 library])
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CPPFLAGS="$old_CPPFLAGS"],
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[AC_MSG_ERROR([Need FreeType library version 2.0.9 or higher])])
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------------------------------------------------------------------------
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Copyright 2002, 2003, 2004, 2005, 2006, 2007 by
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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 this
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file you indicate that you have read the license and understand and
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accept it fully.
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--- end of VERSION.DLL ---
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