In C++, a class name which is declared with class, struct,
or union, is not only a tag, as in C, but also a type name. Thus
there should be stabs with both `t' and `T' symbol descriptors
(see section Giving a Type a Name).
To save space, there is a special abbreviation for this case. If the `T' symbol descriptor is followed by `t', then the stab defines both a type name and a tag.
For example, the C++ code
struct foo {int x;};
can be represented as either
.stabs "foo:T19=s4x:1,0,32;;",128,0,0,0 # 128 is N_LSYM .stabs "foo:t19",128,0,0,0
or
.stabs "foo:Tt19=s4x:1,0,32;;",128,0,0,0
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