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diff --git a/modules/freetype2/docs/VERSIONS.TXT b/modules/freetype2/docs/VERSIONS.TXT new file mode 100644 index 0000000000..92f6a8ccd8 --- /dev/null +++ b/modules/freetype2/docs/VERSIONS.TXT @@ -0,0 +1,135 @@ +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 and Release numbers +------------------------------ + +For each new public release of FreeType 2, there are generally *three* +distinct `version' numbers to consider: + + * The official FreeType 2 release number, like 2.7.0 or 2.10.2. + + * The libtool (and Unix) specific version number, like 23.2.17. + This is what + + pkg-config freetype2 --modversion + + or + + freetype-config --version + + returns. + + * The platform-specific shared object number, used for example when + the library is installed as `/usr/lib/libfreetype.so.6.17.2'. + +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 `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. + + +2. History +---------- + +The following table gives, for all releases since 2.5.0, the +corresponding libtool number, as well as the shared object number +found on _most_ systems, but not all of them: + + + release libtool so + ------------------------------- + 2.13.0 25.0.19 6.19.0 + 2.12.1 24.3.18 6.18.3 + 2.12.0 24.2.18 6.18.2 + 2.11.1 24.1.18 6.18.1 + 2.11.0 24.0.18 6.18.0 + 2.10.4 23.4.17 6.17.4 + 2.10.3 23.3.17 6.17.3 + 2.10.2 23.2.17 6.17.2 + 2.10.1 23.1.17 6.17.1 + 2.10.0 23.0.17 6.17.0 + 2.9.1 22.1.16 6.16.1 + 2.9.0 22.0.16 6.16.0 + 2.8.1 21.0.15 6.15.0 + 2.8.0 20.0.14 6.14.0 + 2.7.1 19.0.13 6.13.0 + 2.7.0 18.6.12 6.12.6 + 2.6.5 18.5.12 6.12.5 + 2.6.4 18.4.12 6.12.4 + 2.6.3 18.3.12 6.12.3 + 2.6.2 18.2.12 6.12.2 + 2.6.1 18.1.12 6.12.1 + 2.6.0 18.0.12 6.12.0 + 2.5.5 17.4.11 6.11.4 + 2.5.4 17.3.11 6.11.3 + 2.5.3 17.2.11 6.11.2 + 2.5.2 17.1.11 6.11.1 + 2.5.1 17.0.11 6.11.0 + 2.5.0 16.2.10 6.10.2 + + +3. Autoconf Code Fragment +------------------------- + +Lars Clausen contributed the following autoconf fragment to check +which version of FreeType is installed on a system (now updated to use +`pkg-config' instead of `freetype-config'). This one tests for a +version that is at least 2.10.2; you should change it to check against +other release numbers. + + + AC_MSG_CHECKING([whether FreeType version is 2.10.2 or higher]) + old_CPPFLAGS="$CPPFLAGS" + CPPFLAGS=`pkg-config freetype2 --cflags` + AC_TRY_CPP([ + +#include <ft2build.h> +#include <freetype/freetype.h> + +#if FREETYPE_MAJOR*10000 + FREETYPE_MINOR*100 + FREETYPE_PATCH < 21002 +# error FreeType version too low. +#endif + + ], + [AC_MSG_RESULT(yes) + FREETYPE_LIBS=`pkg-config freetype2 --libs` + AC_SUBST(FREETYPE_LIBS) + AC_DEFINE(HAVE_FREETYPE,1,[Define if you have the FreeType2 library]) + CPPFLAGS="$old_CPPFLAGS"], + [AC_MSG_ERROR([Need FreeType library version 2.10.2 or higher])]) + +---------------------------------------------------------------------- + +Copyright (C) 2002-2023 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 VERSIONS.TXT --- |