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This adds a new configuration file, 'contrib/conftest/basic.dfa' which disables unused APIs on a test Linux-based system. So support the configuration several fixes were necessary in the test programs so that the tests are skipped correctly when APIs are not available. The configuration has been tested on a range of common Linux apps including web browser code (qtwebengine), image processing code (e.g. ImageMagick) and general display code (X11, Qt5 and Qt6, KDE). Overall this first step reduces libpng linked code and data size to about 2/3 of the full configuration. To use the new test simply copy basic.dfa to 'pngusr.dfa' in the root of the source directory and build. Signed-off-by: John Bowler <jbowler@acm.org>
This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library, although some are used for testing the library via "make check".