[Vm-dev] SIZEOF_VOID_P 8 and mprotect

[gettimothy]

Hi All.


Don't spend brain cycles on this, but I want to mention it in passing.


I am working out integrating Ian's configuration approach into the CMakeVMakerSqueak and ran into this interesting thing.


Ian's code on my system will detect the SIZEOF_ stuff on my system



#define SIZEOF_INT 4

#define SIZEOF_LONG 8
#define SIZEOF_LONG_LONG 8
#define SIZEOF_VOID_P 8

 
When I go to run the cog, I get this error.



mprotect(x,y,PROT_READ | PROT_WRITE | PROT_EXEC): Cannot allocate memory
Segmentation fault (core dumped)


 


Changing SIZEOF_VOID_P to 4 makes that problem go away and the image launches.


I am thinking I am going to throw a conditional in the configuration such that if it is a 64 bit system with 32 bit libs, to work around this.


I mention this in passing in case there is a "magic" 
#define mprotect_will_just_work 1 
 
flag or something.




cordially,


tty







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