fff5f7d5d8
Add pngprefix.h file generated by libpng configure/make process (which we
don't run during wxWidgets build, so this is something that will need to be
redone manually whenever libpng is upgraded, the procedure for doing this is
documented in docs/tech/tn0025.txt) in order to use "wx_" prefix for all
libpng public symbols. This should avoid at least some problems due to the
conflicts between the built-in libpng and shared libpng loaded into the
process as GTK+ libraries dependency under Unix.
Also rename wx_png_{warning,error} to use upper case PNG for consistency with
wx_PNG_stream_{reader,writer} and to avoid conflict with png_{warning,error}()
which we now rename to have "wx_" prefix.
Closes #14157.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74451 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
128 lines
5.0 KiB
Plaintext
128 lines
5.0 KiB
Plaintext
How to update a third party library to a newer version
|
|
======================================================
|
|
|
|
0. Introduction
|
|
---------------
|
|
|
|
wxWidgets includes several third party libraries, i.e. libraries which are
|
|
used by wxWidgets and distributed with it but which we don't maintain nor even
|
|
modify, inasmuch as possible, ourselves. These libraries are developed by
|
|
their maintainers and from time to time we need to replace the versions used
|
|
by wxWidgets with newer versions.
|
|
|
|
|
|
1. Vendor branches
|
|
------------------
|
|
|
|
Normally all third party libraries should be managed using Subversion vendor
|
|
branches. I.e. we should have the latest version of the library under
|
|
/wx/wxWidgets/vendor directory in the repository. Currently only expat, libpng
|
|
and libtiff are handled like this, while libjpeg and zlib are not. Hopefully
|
|
these exceptions will disappear soon, the rest of this note assumes that we
|
|
are using a vendor branch for the library $(LIB).
|
|
|
|
We also use $(OLD_VERSION) and $(VERSION) below for the current version of the
|
|
library and the version we are upgrading to. $(OLD_VERSION) can be determined
|
|
by doing
|
|
|
|
svn ls https://svn.wxwidgets.org/svn/wx/wxWidgets/vendor/$(LIB)
|
|
|
|
as normally it's the latest version present in this directory. You can, of
|
|
course, also look at the library sources currently in the trunk to find out
|
|
its version.
|
|
|
|
|
|
NB: the instructions here are based on the Subversion documentation, see
|
|
http://svnbook.red-bean.com/en/1.6/svn.advanced.vendorbr.html for more
|
|
information about vendor branches.
|
|
|
|
|
|
2. Updating the current branch
|
|
------------------------------
|
|
|
|
The first thing to do is to checkout a pristine copy of the version currently
|
|
being used, e.g.
|
|
|
|
cd /some/temp/directory
|
|
svn checkout https://svn.wxwidgets.org/svn/wx/wxWidgets/vendor/$(LIB)/current $(LIB)
|
|
|
|
Now delete all the old files:
|
|
|
|
cd $(LIB)
|
|
find . -type f -not -path '*/.svn/*' -exec rm {} \;
|
|
|
|
or, if you are using zsh, just
|
|
|
|
rm **/*(.)
|
|
|
|
Next, get the version of the library you are updating to and unpack it into
|
|
the same directory. Examine "svn status" output and add all the files with "?"
|
|
in the first column using "svn add" and delete all the files with "!" in the
|
|
first column using "svn rm".
|
|
|
|
Finally commit and tag the new version:
|
|
|
|
svn commit -m 'Update $(LIB) to $(VERSION).'
|
|
svn cp https://svn.wxwidgets.org/svn/wx/wxWidgets/vendor/$(LIB)/current \
|
|
https://svn.wxwidgets.org/svn/wx/wxWidgets/vendor/$(LIB)/$(VERSION) \
|
|
-m 'Tagging $(LIB) $(VERSION).'
|
|
|
|
You can now do
|
|
|
|
rm -rf /some/temp/directory/$(LIB)
|
|
|
|
as it won't be needed any longer.
|
|
|
|
|
|
3. Merging the current branch
|
|
-----------------------------
|
|
|
|
Now switch to wxWidgets checkout and run
|
|
|
|
svn merge ^/wxWidgets/vendor/$(LIB)/$(OLD_VERSION) ^/wxWidgets/vendor/$(LIB)/current src/$(LIBDIR)
|
|
|
|
Notice that you may need to escape the circumflexes with backslashes if they
|
|
are special for your shell. Also notice that the directory of the library may
|
|
be different from its name, e.g. we use libpng for the vendor branch but just
|
|
png for the name of the directory.
|
|
|
|
Unless you are very lucky, the merge will result in conflicts and you will
|
|
need to resolve them by examining the differences -- this is the difficult
|
|
part.
|
|
|
|
Once everything was resolved, test your changes. As building the third party
|
|
libraries is quite different between Unix and Windows, please do it under both
|
|
platforms. Under Windows it's enough to just build everything as usual as the
|
|
built-in libraries are used by default. Please build both static and dynamic
|
|
wxWidgets libraries as some problems arise only in one of those configurations.
|
|
Under Unix you need to configure with --with-$(LIB)=builtin option to ensure
|
|
that the newly updated built-in version of the library is used and not the
|
|
system version. If upgrading an image format library, please build and run the
|
|
image sample. In any case, run the unit tests to check that everything still
|
|
works.
|
|
|
|
After testing and correcting the problems, simply commit your changes:
|
|
|
|
svn commit -m 'Update $(LIB) to $(VERSION).' src/$(LIBDIR)
|
|
|
|
|
|
4. Special instructions for libpng
|
|
----------------------------------
|
|
|
|
We use a special hack for libpng as we want to prefix all its symbols with
|
|
"wx_" but don't want to use its build system which makes this easily possible
|
|
(perhaps we should, but for now we don't). So, when upgrading libpng, you need
|
|
to perform an extra step after merging the new version (and before committing
|
|
your changes):
|
|
|
|
Create a temporary build directory and run libpng configure from it using
|
|
--with-libpng-prefix=wx_ option. Then run "make" (actually just "make png.lo"
|
|
is sufficient as we don't really need to build the library) to create
|
|
pnglibconf.h and pngprefix.h files in the build directory. And copy these
|
|
files to src/png subdirectory of the wxWidgets source tree, overwriting the
|
|
versions there.
|
|
|
|
Notice that config.h generated by libpng configure is not used, we build it
|
|
without -DHAVE_CONFIG_H as it works just fine without it on any ANSI C system
|
|
(i.e. anywhere by now).
|