Microsoft open sources GWBASIC

[Maciej W. Rozycki]

On Sun, 31 May 2020, Eric Korpela via cctalk wrote:

> C
> C     CHANGE THE VALUE OF 4
> C
> 
>       CALL INC(4)
>       WRITE (*, 30) 4
> 30    FORMAT ('2+2=',I4)
>       END
> 
>       SUBROUTINE INC(I)
>       I = I + 1
>       END
> 
> -------- OUTPUT
> 2+2=   5

 Hmm, as a matter of interest I fed this program to current trunk GCC and 
with an x86/Linux system it crashes at the incrementation of the literal, 
because the value has been assigned to a read-only memory segment.  With a 
RV64/Linux system it works as expected as the compiler gives priority to 
data assignment to the small data area over the read-only attribute, but 
I'd call it luck rather than intent.

 GCC supports legacy Fortran code, so I have filed PR fortran/95631 to 
track this bug, at: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95631>.  
Let's see what emerges.

 Thanks for sharing this peculiarity with us!

  Maciej