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Agreed with Sina regarding the reason for the crash & why moving temp decl inside main 'fixes' it. But no one's answered the other part of the question -- once change is made, why does observed value change for fun() but not for main() ?
- Karl.Zimmerman@utas.utc.com September 08, 2014That's because optimizing compilers will typically cache data in processor registers when they have no reason to think the data will change (if a register is available). Declaring temp 'const' explicitly tells the compiler it's OK to do that. So main copies the initial value of temp to a register, and never re-loads it from memory; fun() changes the value in memory, but that new value is never read by main().