tree 196a966c42ae620f1e7b14653d4859846fd7243d
parent 805ed7a2d4e5e3f7a337fc51af26a3339ac24606
author John Bowler <jbowler@acm.org> 1706865297 -0800
committer Cosmin Truta <ctruta@gmail.com> 1706873042 +0200

API usage: add 'basic' configuration

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>