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GCC's "-fno-strict-aliasing"? (Developers)

posted by RayeR , CZ, 18.09.2008, 14:10

> As far as I know does the C standard has a few rules about aliassing. An
> alias is e.g. if you have two pointers of different types, then C assumes
> that they can't point to the same memory.

Did you mean something like this?

unsigned long *p1;
unsigned char p2[4]={1,2,3,4};

p1=(unsigned long *)p2;

Is p1 alias of p2? What's wrong on this code? Will it fails to compile if -fno-strict-aliasing enabled? U use such things of retyping very often, eg. when you have a char buffer and you want to access it as a structure.

---
DOS gives me freedom to unlimited HW access.

Complete thread:

• GCC's "-fno-strict-aliasing"? - rr, 17.09.2008, 18:01
  • GCC's "-fno-strict-aliasing"? - marcov, 18.09.2008, 10:30
    • GCC's "-fno-strict-aliasing"? - rr, 18.09.2008, 11:37
      • GCC's "-fno-strict-aliasing"? - marcov, 18.09.2008, 13:20
    • GCC's "-fno-strict-aliasing"? - RayeR, 18.09.2008, 14:10
  • GCC's "-fno-strict-aliasing"? - rr, 25.09.2008, 16:38
    • GCC's "-fno-strict-aliasing"? - RayeR, 29.09.2008, 17:09