Cosmin Truta 23bdc7a6c4 build: Add the CMake build option PNG_LIBCONF_HEADER ...

Running the pnglibconf scripts (script/*.awk) is not always possible.
An AWK interpreter is not always guaranteed to be available; and even
if it is, there are limitations when making cross-platform libpng
builds, especially when the differences between the host platform and
the target platform are significant. For example:
 * Building for the Windows (MinGW) target on a Unix development host;
 * Building for the iOS target on a macOS development host;
 * Building for the Android target on any development host.

In such scenarios, a preconfigured (i.e. prebuilt) pnglibconf.h file,
either taken from the libpng source tree or provided by the user who
wants to make a custom libpng build, becomes a necessity.

In this commit we introduce the build option `PNG_LIBCONF_HEADER` in
order to address this specific use case.

We also specify a version range (3.14...4.0) for the minimum required
CMake program, to future-proof the CMake build for just a little bit
longer.

Signed-off-by: Cosmin Truta <ctruta@gmail.com>

2025-04-28 20:44:53 +03:00

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