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Bug 4198

Summary: Failure loading libpng for 2.0.2+ when building with mingw32
Product: SDL_image Reporter: Adam <adam.hzero>
Component: miscAssignee: Sam Lantinga <slouken>
Status: ASSIGNED --- QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: 2.0.2   
Hardware: x86_64   
OS: Windows 10   

Description Adam 2018-06-13 19:36:52 UTC 
Overview:

I'm building an SDL application in Go using a sample repository (https://github.com/adam000/go-sdl2-wsl-build-windows) to reproduce the problem. (full repro instructions at https://github.com/veandco/go-sdl2/issues/336 )

I'm building from Windows Subsystem for Linux to create a Windows build (using the bash script in the example). It works for SDL_image version 2.0.1 but not newer versions. On newer versions, it fails with the following message:

> Failed to load PNG: Failed loading libpng16-16.dll: The specified procedure could not be found.

I *can* get newer versions to work simply by replacing the libpng DLL with the one bundled in SDL_image 2.0.1. I noticed that libpng was upgraded after 2.0.1 and before 2.0.2 (revision 518).

Steps to reproduce:

1. On WSL, run `./make-win64-on-wsl.bash` from repository root, optionally providing a destination like `/mnt/c/Users/myuser/Desktop`.
2. Under Windows command line, navigate to the destination and run build.exe

Actual results:

Application crashes with:

> Failed to load PNG: Failed loading libpng16-16.dll: The specified procedure could not be found.

Expected Results:

A png of a drawing of a gopher should appear on the screen for several seconds, then disappear.

Additional information:

Related forum post: https://discourse.libsdl.org/t/sdl2-image-fails-loading-libpng-on-latest-versions-when-cross-compiling/24494