diff options
Diffstat (limited to 'nx-X11/extras/freetype2/docs/VERSION.DLL')
| -rw-r--r-- | nx-X11/extras/freetype2/docs/VERSION.DLL | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/nx-X11/extras/freetype2/docs/VERSION.DLL b/nx-X11/extras/freetype2/docs/VERSION.DLL new file mode 100644 index 000000000..9e27a57d2 --- /dev/null +++ b/nx-X11/extras/freetype2/docs/VERSION.DLL @@ -0,0 +1,110 @@ +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 + ------------------------------- + 2.1.9 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])]) + + +--- end of VERSION.DLL --- |