compiler construction - What can be the possible reasons for the object code of an unchanged C++ file to change on recompilation? -

it's not question. it's dormant question found on quora. 1 answer of header files might have changed author of questions claims did not. love hear people here have :)

• changed header files
• different compiler
• different command line options
• timestamp in object code
• nondeterministic code generator or optimizer
• profile-driven optimization changed profile
• nondeterminism induced changes in os provided services