126 lines
4.0 KiB
Plaintext
126 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 2.3.1 or 2.4.10.
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* The libtool (and Unix) specific version number, like 13.0.7. This
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is 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.6.7.1'.
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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.
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2. History
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----------
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The following table gives, for all releases since 2.4.0, the
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corresponding libtool number, as well as the shared object number found
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on _most_ systems, but not all of them:
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release libtool so
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-------------------------------
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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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2.4.12 16.1.10 6.10.1
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2.4.11 16.0.10 6.10.0
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2.4.10 15.0.9 6.9.0
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2.4.9 14.1.8 6.8.1
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2.4.8 14.0.8 6.8.0
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2.4.7 13.2.7 6.7.2
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2.4.6 13.1.7 6.7.1
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2.4.5 13.0.7 6.7.0
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2.4.4 12.2.6 6.6.2
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2.4.3 12.1.6 6.6.1
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2.4.2 12.0.6 6.6.0
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2.4.1 11.1.5 6.5.1
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2.4.0 11.0.5 6.5.0
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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 2002-2018 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 VERSIONS.TXT ---
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