-inline switch changes code behaviour

[francesco cattoglio via Digitalmars-d-learn]

Today I just realized that in DMD optimize flag does not imply 
inlining, therefore I promptly added the "inline" to my dub build 
settings and recompiler, expecting to see speedups in my code 
execution.
To my surprise, I could not see anything at all: all that I get 
now is a blank screen.

The rendering code uses an old-ish version of gfm-sdl, but I did 
not find any issue related to compiler swirches.
Any idea about what might be happening/any suggestion on how to 
debug this?