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Bug 4192

Summary: Define replacement __iob_func() in header to avoid VS linker errors when mixing versions
Product: SDL Reporter: Andreas Schiffler <aschiffler>
Component: buildAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: trivial    
Priority: P2    
Version: don't know   
Hardware: x86   
OS: Windows 10   

Description Andreas Schiffler 2018-06-08 14:42:30 UTC 
As per
https://stackoverflow.com/questions/30412951/unresolved-external-symbol-imp-fprintf-and-imp-iob-func-sdl2
the __iob_func is not defined anymore which leads to a link error when using a .lib file compiled with previous versions of Visual Studio.

People are hitting this when compiling against SDL2Test, i.e. see here: http://www.ferzkopp.net/wordpress/2016/01/02/sdl_gfx-sdl2_gfx/#comment-94

A fix would be largely cosmetic: add a compile time check and replacement definition such as

FILE _iob[] = {*stdin, *stdout, *stderr};
extern "C" FILE * __cdecl __iob_func(void)
{
    return _iob;
}

to a SDL header.
Comment 1 Sam Lantinga 2019-06-18 15:37:48 UTC 
SDL 2.0.10 release is now built with Visual Studio 2017.