分享一個簡單判別程式是32位元還是64位元的方法

• 64bit
  root@Lab1 # file testmem
  testmem: PA-RISC2.0 shared executable dynamically linked -not stripped
• 32bit
  root@Lab1 # file /usr/bin/ls
  /usr/bin/ls: PA-RISC1.1 shared executable dynamically linked

PA2.0 can support 64 bit and 32bit mode. an a.out can be as a 32 bit binary in PA2.0, if you complie it with +DA2.0 option.

If you complie with +DA2.0W then the a.out will be as 64bit binary in PA2.0

Summary compile options as
+DA1.1 - 32bit in PA1.1
+DA2.0 - 32bit in PA2.0
+DA2.0W - 64bit in PA2.0

compile時的差異

• 64 bit
  $ cc +DA2.0W a.c
  $ file a.out
  a.out: ELF-64 executable object file - PA-RISC 2.0 (LP64)

• 32 bit
  $ cc +DA2.0 a.c
  $ file a.out
  a.out: PA-RISC2.0 shared executable dynamically linked -not stripped
  $ cc +DA1.1 a.c
  $ file a.out
  a.out: PA-RISC1.1 shared executable dynamically linked -not stripped