[Bug c/63645] Incorrect code generation

[terra at gnome dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63645

M Welinder <terra at gnome dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |---

--- Comment #5 from M Welinder <terra at gnome dot org> ---
You guys are trigger happy.

> Your union simply takes more space than your GnmExprBinary struct

Of course it does!  The union requires space that is large enough
for its largest member, so having a smaller member is going to be
the case in 99% of unions and the standard has no objections.
If you think otherwise, a reference to the standard would be nice.

To show that the size difference is irrelevant, simply change
GnmExprBinary to

typedef struct {
    guint8 oper;
    int argc;
    GnmFunc *func;
} GnmExprBinary;

whereupon GnmExprBinary, GnmExprFunction, and GnmExpr all take up the
same amount of space.

We still get this error from valgrind.

==6201== Conditional jump or move depends on uninitialised value(s)
==6201==    at 0x4005F8: test (vvv.c:38)
==6201==    by 0x4004D8: main (vvv.c:49)