Compiling a program on 64 bits HW/OS

[Sathya Sastry]

I am trying to compile and link a program on 64 bit system so that I can use higher memory requirement.
The maxdsiz_64 is set higher than 4GB, but when I compile and run a sample program, the program exits after allocating 1.8GB memory.

I am not using any specific flags except the following.
-Aa -DD64 -N

According to Compiler document, for a 64 bit process, it should be able to use larger than 4GB vertual address space.

Any tips and corrections to compile/link flags?

Thanks,
Regards,
Sathya.

[ranganath ramachandra · Accepted solution]

im not sure if that was a typo you made only in posting here - the correct compiler flag is +DD64, not -DD64. no special linker flags are required (or exist), the linker will know whether its a 32- or 64- bit link from the object files.

[Tim Adamson_1]

Hi Sathya,

The -DD64 should be +DD64.

Check the cc man page.


Cheers!

[Sathya Sastry]

Thanks, that solved my issue.