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API usage: add 'basic' configuration

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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 commit is contained in:
John Bowler
2024-02-02 01:14:57 -08:00
committed by Cosmin Truta
parent 805ed7a2d4
commit ce1f1f001e
5 changed files with 193 additions and 22 deletions
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5
contrib/tools/pngfix.c
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@@ -133,11 +133,6 @@
/* Is it safe to copy? */
#define SAFE_TO_COPY(chunk) (((chunk) & PNG_U32(0,0,0,32)) != 0)
/* Fix ups for builds with limited read support */
#ifndef PNG_ERROR_TEXT_SUPPORTED
# define png_error(a,b) png_err(a)
#endif
/********************************* UTILITIES **********************************/
/* UNREACHED is a value to cause an assert to fail. Because of the way the
* assert macro is written the string "UNREACHED" is produced in the error