Re: new module 'jit/cache'

[Bruno Haible]

Hello Marc,

> Here is my attempt at a simple unit test for your new cache module.
> 
> I have tested it on an x86 box (where the instruction cache is always in
> sync) and on an Armv8 Raspberry, both running GNU/Linux.  Commenting out
> the call to `clear_cache' shows that `clear_cache' is not a NOP on Arm and
> that the test is actually doing a non-trivial test.

Very nice! It is simpler than what I had expected (no per-CPU #ifdefs so far).

I've committed your patch (as two separate patches).

I will test it on various platforms.

For the moment, I expect
  - a SIGSEGV on powerpc*-aix, powerpc64-linux, ia64, hppa, and hppa64
    due to the structure of function pointers, see
    
https://git.savannah.gnu.org/gitweb/?p=libffcall.git;a=blob;f=porting-tools/abis/function-pointer.txt
  - a link error on native Windows, due to the use of mprotect() outside
    #ifdefs.

But we'll see...

Bruno