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I wanna know probable problems faced while moving C programs for eg. server process from Tru64 Unix to Linux 64 bits and why? What probable modifications the program would need or only recompiling the source code in new environment would do as both are 64 bit platforms? I am a little confused, I gotta know before I start working on it.
I spent a lot of time in the early 90s (OMG I feel old…) porting 32-bit code to the Alpha architecture. This was back when it was called OSF/1.
You are unlikely to have any difficulties relating to the bit-width when going from Alpha to x86_64.
Developers are much more aware of the problems caused by assuming that
sizeof(int) == sizeof(void *), for example. That was far and away the most common problem I used to have when porting code to Alpha.Where you do find differences they will be in how the two systems differ in their conformity to various API specifications, e.g. POSIX, XOpen, etc. That said, such differences are normally easily worked around.
If the Alpha code has used the SVR4 style APIs (e.g. streams) that you may have more difficulty than if it has used the more BSD-like APIs.