99 lines
3.6 KiB
Plaintext
99 lines
3.6 KiB
Plaintext
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
|
|
-------------------------------------
|
|
2.1.4 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 ?
|
|
|
|
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 the last line to check
|
|
against other release numbers.
|
|
|
|
AC_MSG_CHECKING([for version of FreeType])
|
|
FREETYPE_INCLUDE=`freetype-config --cflags | cut -c3-`
|
|
FREETYPE_MAJOR=`grep '^#define FREETYPE_MAJOR' \
|
|
$FREETYPE_INCLUDE/freetype/freetype.h | cut -d' ' -f3`
|
|
FREETYPE_MINOR=`grep '^#define FREETYPE_MINOR' \
|
|
$FREETYPE_INCLUDE/freetype/freetype.h | cut -d' ' -f3`
|
|
FREETYPE_PATCH=`grep '^#define FREETYPE_PATCH' \
|
|
$FREETYPE_INCLUDE/freetype/freetype.h | cut -d' ' -f3`
|
|
FREETYPE_VERSION=`echo | awk "BEGIN { printf \"%d\", \
|
|
($FREETYPE_MAJOR * 1000 + $FREETYPE_MINOR) * 1000 \
|
|
+ $FREETYPE_PATCH;}"`
|
|
AC_MSG_RESULT([$FREETYPE_MAJOR.$FREETYPE_MINOR.$FREETYPE_PATCH])
|
|
if test "$FREETYPE_VERSION" -ge 2000009; then
|
|
|
|
|
|
--- end of VERSION.DLL ---
|