Re: [Tinycc-devel] tcctest.c fails on Windows

[David A. Wheeler]

Sven Oliver Moll wrote:
> Hello!
>
> I've been playing around a bit with tcc on both the Linux and Windows 
> platforms I have.
>
> I noticed that the tcctest.c doesn't put out the same results on Windows
> as on Linux (or cygwin or mingw), no matter if it's compiled with MinGW
> or selfcompiled. As far as I can tell from the output there seems to be
> problems when it comes to long doubles.
>
> Just wanted to drop this here, because I don't know if it's a known bug
> or not.

I had a similar experience (long doubles cause a change of result),
though it wasn't Windows vs. Linux.  Someone else here explained my
question; it may explain yours too.

"long double" only takes 10 bytes, but for alignment purposes it takes
12 bytes.  The last two "extra" bytes aren't particularly controlled
(they take "junk" values).  I would prefer that this always be zero'ed,
so that results were always the same, but I haven't tried to make
such a patch.

--- David A. Wheeler