169 lines
6.0 KiB
Plaintext
169 lines
6.0 KiB
Plaintext
README.bundled-libs.txt - Developer information for bundled libraries
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---------------------------------------------------------------------
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This file is mainly intended for FLTK developers and contains information
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about the current versions of all bundled libraries and about how to
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upgrade these bundled libraries.
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Current versions of bundled libraries (as of Feb 25, 2021):
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Library Version Release date FLTK Version
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--------------------------------------------------------------------------
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jpeg jpeg-9d 2020-01-12 1.3.6
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png libpng-1.6.37 2019-04-14 1.3.6
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zlib zlib-1.2.11 2017-01-15 1.3.6
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--------------------------------------------------------------------------
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Previous versions of bundled libraries:
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Library Version Release date FLTK Version
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------------------------------------------------------------------
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jpeg jpeg-9a 2014-01-19 1.3.5
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png libpng-1.6.16 2014-12-22 1.3.5
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zlib zlib-1.2.8 2013-04-28 1.3.5
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--------------------------------------------------------------------------
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General information:
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FLTK does not include the entire library distributions. We only provide the
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source files necessary to build the FLTK library and some README and/or
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CHANGELOG files. There are no test programs or other contributed files.
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We use our own build files, hence a few files MUST NOT be upgraded when
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the library source files are upgraded. We strive to keep changes to the
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library source files as small as possible. Patching library code to
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work with FLTK should be a rare exception.
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If patches are necessary all changes in the library files should be
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marked with "FLTK" in a comment so a developer who upgrades the library
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later is aware of changes in the source code for FLTK. Additional comments
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should be added to show the rationale, i.e. why a particular change was
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necessary. If applicable, add a reference to a Software Trouble Report,
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GitHub Issue or PR like "STR 3456", "Issue #123", or "PR #234".
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How to update the bundled libraries:
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It is generally advisable to use a graphical merge program. I'm using
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'meld' under Linux, but YMMV.
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Do not add any source files unless they are required to build the library.
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Some config header files may be pre-generated in the FLTK sources. These
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header files should be left untouched, but it may be necessary to update
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these files if new items were added to the new library version. In this
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case the new header should be pre-generated on a Linux system with default
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options unless otherwise mentioned below for a specific library.
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Currently there are no known exceptions.
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Merging source files:
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Please check if some source and header files contain "FLTK" comments
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to be aware of necessary merges. It is also good to get the distribution
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tar ball of the previous version and to run a (graphical) diff or
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merge tool on the previous version and the bundled version of FLTK
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to see the "previous" differences.
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Files that were not patched in previous versions should be copied to
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the new version w/o changes. Files that had FLTK specific patches must
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be merged manually. FLTK patches should be verified (if still necessary)
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and should be kept in the new source files.
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Source and header files that have been added in the new library version
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should be added in FLTK as well if they are necessary to build the
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library. A simple "trial and error" should be sufficient to find files
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that need to be added. Added files must be added to FLTK's build files
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as well, usually to both `Makefile' and `CMakeLists.txt' to be used in
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configure/make and in CMake based builds, respectively.
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Upgrade order:
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There is only one dependency between all bundled libraries: libpng
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depends on zlib. Hence zlib should be upgraded first, then all other
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libs can be upgraded in arbitrary order.
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Tests after merge:
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Tests should be done on as many platforms as possible, both with
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autotools (configure/make) and CMake. Windows (Visual Studio) and
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macOS (Xcode) builds need CMake to generate the IDE files.
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Upgrade notes for specific libraries:
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The following chapters contain information of specific files and how
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they are upgraded. Since the changes in all bundled libraries can't
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be known in advance this information may change in the future. Please
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verify that no other changes are necessary.
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zlib:
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Website: https://zlib.net/
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Download: See website and follow links.
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Repository: git clone https://github.com/madler/zlib.git
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The following files need special handling:
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CMakeLists.txt: Keep FLTK version, update manually if necessary.
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Makefile: Same as CMakeLists.txt.
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zconf.h: Merge changes.
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As of zlib 1.2.11: two small sections marked with "FLTK" comments
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that need to be kept.
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makedepend: Keep this file.
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Run `make depend' in the zlib folder on a Linux system after
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the upgrade to update this file.
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png:
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Website: http://libpng.org/pub/png/libpng.html
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Download: See website and follow links.
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Repository: git clone https://git.code.sf.net/p/libpng/code libpng
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libpng should be upgraded after zlib because it depends on zlib.
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The following files need special handling:
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CMakeLists.txt: Keep FLTK version, update manually if necessary.
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Makefile: Same as CMakeLists.txt.
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pnglibconf.h: Generate on a Linux system and merge.
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makedepend: Keep this file.
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Run `make depend' in the png folder on a Linux system after
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the upgrade to update this file.
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jpeg:
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Website: https://ijg.org/
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Download: See website and follow links.
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Repository: <unknown>
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The following files need special handling:
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CMakeLists.txt: Keep FLTK version, update manually if necessary.
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Makefile: Same as CMakeLists.txt.
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Note: more to come...
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makedepend: Keep this file.
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Run `make depend' in the jpeg folder on a Linux system after
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the upgrade to update this file.
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