132 lines
4.0 KiB
Plaintext
132 lines
4.0 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 2.7.0 or 2.10.2.
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* The libtool (and Unix) specific version number, like 23.2.17.
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This is what
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pkg-config freetype2 --modversion
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or
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freetype-config --version
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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.6.17.2'.
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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
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following macros defined in `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.
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2. History
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----------
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The following table gives, for all releases since 2.5.0, the
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corresponding libtool number, as well as the shared object number
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found on _most_ systems, but not all of them:
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release libtool so
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-------------------------------
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2.11.0 24.0.18 6.18.0
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2.10.4 23.4.17 6.17.4
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2.10.3 23.3.17 6.17.3
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2.10.2 23.2.17 6.17.2
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2.10.1 23.1.17 6.17.1
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2.10.0 23.0.17 6.17.0
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2.9.1 22.1.16 6.16.1
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2.9.0 22.0.16 6.16.0
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2.8.1 21.0.15 6.15.0
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2.8.0 20.0.14 6.14.0
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2.7.1 19.0.13 6.13.0
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2.7.0 18.6.12 6.12.6
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2.6.5 18.5.12 6.12.5
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2.6.4 18.4.12 6.12.4
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2.6.3 18.3.12 6.12.3
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2.6.2 18.2.12 6.12.2
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2.6.1 18.1.12 6.12.1
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2.6.0 18.0.12 6.12.0
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2.5.5 17.4.11 6.11.4
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2.5.4 17.3.11 6.11.3
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2.5.3 17.2.11 6.11.2
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2.5.2 17.1.11 6.11.1
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2.5.1 17.0.11 6.11.0
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2.5.0 16.2.10 6.10.2
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3. Autoconf Code Fragment
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-------------------------
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Lars Clausen contributed the following autoconf fragment to check
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which version of FreeType is installed on a system (now updated to use
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`pkg-config' instead of `freetype-config'). This one tests for a
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version that is at least 2.10.2; 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 2.10.2 or higher])
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old_CPPFLAGS="$CPPFLAGS"
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CPPFLAGS=`pkg-config freetype2 --cflags`
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AC_TRY_CPP([
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#include <ft2build.h>
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#include <freetype/freetype.h>
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#if FREETYPE_MAJOR*10000 + FREETYPE_MINOR*100 + FREETYPE_PATCH < 21002
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# error FreeType version too low.
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#endif
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],
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[AC_MSG_RESULT(yes)
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FREETYPE_LIBS=`pkg-config freetype2 --libs`
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AC_SUBST(FREETYPE_LIBS)
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AC_DEFINE(HAVE_FREETYPE,1,[Define if you have the FreeType2 library])
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CPPFLAGS="$old_CPPFLAGS"],
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[AC_MSG_ERROR([Need FreeType library version 2.10.2 or higher])])
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----------------------------------------------------------------------
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Copyright (C) 2002-2021 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
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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 VERSIONS.TXT ---
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