Re: x86_64: malloc returns erroneous pointer with large argument

[Andreas Schwab]

"Bording, Jan" <address@hidden> writes:

> This error is for x86_64 only !!

You will also get this on ia64.  Fix your program.

> ~>cat test.c
> #include <stdio.h>
#include <stdlib.h>

>
> main()
> {
>   int n;
>   double **A,**B;
>
>   A = (double **)malloc(16000*sizeof(double *));
>   B = (double **)malloc(32000*sizeof(double *));
>
>   A[3] = (double *)malloc(1*sizeof(double));
>   B[3] = (double *)malloc(1*sizeof(double));
> }
>
> ~> gcc -o test test.c -lm
> test.c: In function `main':
> test.c:8: warning: cast to pointer from integer of different size
> test.c:9: warning: cast to pointer from integer of different size
> test.c:11: warning: cast to pointer from integer of different size
> test.c:12: warning: cast to pointer from integer of different size

Never ignore warnings.

Andreas.

-- 
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."