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Subject: [Qemu-devel] Re: SIGSEGV on Windows with KQEMU enabled
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To: qemu-devel@nongnu.org

Johannes Schindelin wrote:

> compiling with --std=c99?

with -std=c99 it does not even compile

> 
> Alternatively, you might want to try to
> 
> #define snprintf __mingw_snprintf
> #define vsnprintf __mingw_vsnprintf
> 

These give linker undefined symbol errors.

But really funny think is the change that triggers the bug is precisely this:
-Monitor *cur_mon;
+Monitor *cur_mon = NULL;

Obviously, kqemu is happier having garbage in the cur_mon than NULL


> in a central place.
> 
> Explanation: M$' C runtime is not C99 compliant.  It interprets %llu to 
> mean "unsigned long", not "unsigned long long".  As a consequence, the 
> bitwidths of the parameters are interpreted wrong, so that pointers after 
> that parameter point anywhere but the correct address.
> 
> As far as I can tell, TDM's GCC works around most of the issue, but forgot 
> snprintf and vsnprintf.
> 
> You might also be interested in this:
> 
> https://sourceforge.net/tracker/index.php?func=detail&aid=2671742&group_id=200665&atid=974439
> 
> Hth,
> Dscho
> 
> 
> 
>