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Some systems such as Symbian insist people to use heap instead of stack when allocating
big objects(such as pathnames, which may be more than 512 bytes). Is there any specific reason for this?
Most embedded devices doesn’t come with a memory management unit so there is no way for the OS to grow the stack space automatically, transparent to the programmer. Even assuming a growable stack, you will have to manage it yourself which is no better than heap allocation and defeats the purpose of using a stack in the first place.