Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 1 | Due to our use of "libtool" to generate and install the FreeType 2 |
| 2 | libraries on Unix systems, as well as other historical events, it is |
| 3 | generally very difficult to know precisely which release of the font |
| 4 | engine is installed on a given system. |
Werner Lemberg | 73c10ae | 2002-09-10 15:17:32 +0000 | [diff] [blame] | 5 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 6 | This file tries to explain why and to document ways to properly detect |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 7 | FreeType on Unix. |
Werner Lemberg | 73c10ae | 2002-09-10 15:17:32 +0000 | [diff] [blame] | 8 | |
Werner Lemberg | 51b6699 | 2002-08-27 16:51:02 +0000 | [diff] [blame] | 9 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 10 | 1. Version & Release numbers |
| 11 | ---------------------------- |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 12 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 13 | For each new public release of FreeType 2, there are generally *three* |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 14 | distinct "version" numbers to consider: |
| 15 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 16 | * The official FT2 release number, like 2.0.9, or 2.1.3. |
David Turner | 8291d25 | 2002-12-26 20:51:04 +0000 | [diff] [blame] | 17 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 18 | * The libtool (and Unix) specific version number, like "9.2.3". This |
| 19 | is what "freetype-config --version" will return. |
David Turner | 8291d25 | 2002-12-26 20:51:04 +0000 | [diff] [blame] | 20 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 21 | * The platform-specific shared object number, used for example when |
| 22 | the library is installed as "/usr/lib/libfreetype.so.6.3.2". |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 23 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 24 | The platform-specific number is, unsurprisingly, platform-specific and |
| 25 | varies with the operating system you are using (several variants of |
| 26 | Linux, FreeBSD, Solaris, etc.). You should thus _never_ use it, even |
| 27 | for simple tests. |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 28 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 29 | The libtool-specific number does not equal the release number but is |
| 30 | tied to it. |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 31 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 32 | The release number is available at *compile* time through the following |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 33 | macros defined in FT_FREETYPE_H: |
| 34 | |
| 35 | - FREETYPE_MAJOR : major release number |
| 36 | - FREETYPE_MINOR : minor release number |
| 37 | - FREETYPE_PATCH : patch release number |
| 38 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 39 | See below for a small autoconf fragment. |
| 40 | |
| 41 | The release number is also available at *runtime* through the |
| 42 | "FT_Library_Version" API. Unfortunately, this one wasn't available or |
| 43 | working correctly before the 2.1.3 official release. |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 44 | |
| 45 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 46 | 2. History |
| 47 | ---------- |
| 48 | |
| 49 | The following table gives, for each official release, the corresponding |
| 50 | libtool number, as well as the shared object number found on _most_ |
| 51 | systems, but not all of them: |
| 52 | |
| 53 | release libtool so |
| 54 | ------------------------------------- |
| 55 | 2.1.4 9.3.3 6.3.3 |
| 56 | 2.1.3 9.2.3 6.3.2 |
| 57 | 2.1.2 9.1.3 6.3.1 |
| 58 | 2.1.1 9.0.3 ? |
| 59 | 2.1.0 8.0.2 ? |
| 60 | 2.0.9 9.0.3 ? |
| 61 | 2.0.8 8.0.2 ? |
| 62 | |
| 63 | The libtool numbers are a bit inconsistent due to the library's history: |
| 64 | |
| 65 | - 2.1.0 was created as a development branch from 2.0.8 (hence the same |
| 66 | libtool numbers). |
| 67 | |
| 68 | - 2.0.9 was a bug-fix release of the "stable" branch, and we |
| 69 | incorrectly increased its libtool number. |
| 70 | |
| 71 | - 2.1.4 is still in the "development" branch, however it is stable |
| 72 | enough to be the basis of an upcoming 2.2.0 release. |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 73 | |
| 74 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 75 | 3. Autoconf Code Fragment |
| 76 | ------------------------- |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 77 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 78 | Lars Clausen contributed the following autoconf fragment to detect which |
| 79 | version of FreeType is installed on a system. This one tests for a |
Werner Lemberg | 77c34b8 | 2003-05-20 22:06:38 +0000 | [diff] [blame] | 80 | version that is at least 2.0.9; you should change it to check against |
| 81 | other release numbers. |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 82 | |
Werner Lemberg | 77c34b8 | 2003-05-20 22:06:38 +0000 | [diff] [blame] | 83 | |
| 84 | AC_MSG_CHECKING([whether FreeType version is 2.0.9 or higher]) |
| 85 | old_CPPFLAGS="$CPPFLAGS" |
| 86 | CPPFLAGS=`freetype-config --cflags` |
| 87 | AC_TRY_CPP([ |
| 88 | #include <freetype/freetype.h> |
| 89 | #if (FREETYPE_MAJOR*1000 + FREETYPE_MINOR)*1000 + FREETYPE_PATCH < 2000009 |
| 90 | #error Freetype version too low. |
| 91 | #endif |
| 92 | ],[ |
| 93 | AC_MSG_RESULT(yes) |
| 94 | FREETYPE_LIBS=`freetype-config --libs` |
| 95 | AC_SUBST(FREETYPE_LIBS) |
| 96 | AC_DEFINE(HAVE_FREETYPE,1,[Define if you have the FreeType2 library]) |
| 97 | CPPFLAGS="$old_CPPFLAGS" |
| 98 | ],[ |
| 99 | AC_MSG_ERROR([Need FreeType library version 2.0.9 or higher]) |
| 100 | ]) |
David Turner | 621e488 | 2002-12-16 21:51:24 +0000 | [diff] [blame] | 101 | |
| 102 | |
Werner Lemberg | a16c4a7 | 2003-04-21 13:30:27 +0000 | [diff] [blame] | 103 | --- end of VERSION.DLL --- |