Conversion from 32-bit to 64-bit OS

[IH8CPP]

Hi, not sure if this topic has already been addressed elsewhere (sorry but I haven't checked) but I have a source code that compiles and runs fine on my 32-bit linux platform, however, I now need to get it working on a new 64-bit OS. The code is quite long and has around 20 subroutines so rather than posting fragments of the code here (not yet anyway) I was just hoping to get some general advice on converting source code from 32-bit to 64-bit: things like any additional header files that may be required and declaration of variable types. Hope someone can offer some advice and point me in the right direction. Cheers.

[weaknessforcats]

What 64-bit OS?

64-bit Windows is different from 64-bit Unix.

[IH8CPP]

What 64-bit OS?

64-bit Windows is different from 64-bit Unix.

It's a 64-bit Linux OS

[weaknessforcats]

Probably it should convert straight across but you need to be aware of the change from 32-bit integers to 64-bit integers. You need to check the sizes of all of the fundamental types between your 32-bit and 64-bit OSs.

Any code that writes to disk will write 64 bit integers instead of 32. Conversely any code that reads from the disc will read 64 bits. If the disc file was written with 32-bit integers, you will need to convert the file before feeding it to your 64-bit program.

The disc spreads to the displays, which are all now larger - and any reports - and all your backups, etc...

So, I expect your 32-buit code will compile but whether it runs as before will need some research.

[Banfa]

Any code that writes to disk will write 64 bit integers instead of 32. Conversely any code that reads from the disc will read 64 bits. If the disc file was written with 32-bit integers, you will need to convert the file before feeding it to your 64-bit program.

Converting the file is not the only solution, you can re-write the code to read and write the file format as it already exists.

[IH8CPP]

[So, I expect your 32-buit code will compile but whether it runs as before will need some research.[/quote]

Hi, yes in fact the code does compile successfully - the problem arises when executing the program and trying to read in data files: segmentation fault. I have checked and the sizeof() operator returns the same value for all variable types on both the 32-bit and 64-bit linux platforms. Is there some declaration that I can implement in the source that forces the 64-bit machine to read in data files in the exact same manner as the 32-bit machine, since everything works perfectly on the 32-bit platform. Cheers