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Bug 2191

Summary: SDL2-2.0.1/src/video/SDL_egl.c:397: possible bad if test ?
Product: SDL Reporter: David Binderman <dcb314>
Component: videoAssignee: Gabriel Jacobo <gabomdq>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: amaranth72, gabomdq
Version: 2.0.1   
Hardware: x86_64   
OS: Linux   

Description David Binderman 2013-10-28 16:59:55 UTC 
I just compiled SDL2-2.0.1 with gcc compiler flag -Wlogical-op

It said

/home/dcb/rpmbuild/BUILD/SDL2-2.0.1/src/video/SDL_egl.c:397:5: warning: logical 'and' of mutually exclusive tests is always false [-Wlogical-op]

Source code is

    if (!egl_context && egl_context != EGL_NO_CONTEXT) {

Suggest code rework.
Comment 1 Gabriel Jacobo 2013-10-30 12:40:16 UTC 
I may be still jet lagged, but I don't understand the warning...the test is "if egl_context is not null and it is not EGL_NO_CONTEXT then...", they are not mutually exclusive, why does GCC think it is?
Comment 2 Alex Szpakowski 2013-10-30 21:32:29 UTC 
The test is "if egl_context *is* null and it is not EGL_NO_CONTEXT", which I suspect was not the intention when that was written. :)
Comment 3 Gabriel Jacobo 2013-10-31 13:04:31 UTC 
You learn new things every day, today I learned to not make a fool of myself by not getting enough rest before doubting GCC :)

Thanks guys!

http://hg.libsdl.org/SDL/rev/0bca3fe7c03f