[Bug gdb/30204] RFE add an option to to ptype to print the decl file and decl line for a type

["woodard at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30204

--- Comment #2 from Ben Woodard <woodard at redhat dot com> ---
"info types REGEX" can do what I need in many cases. However, it becomes rather
unhandy in C++ code where the number of types can be astronomically large. It
also doesn't associate it with a variable in the particular context the way
that ptype does. This can be particularly confusing when you have ABI
compatible but polymorphic C types defined differently in different compilation
units. For example a few days ago I was dealing with four different versions of
struct _Unwind_Context and the type changed depending on which function I
happened to be in. It was hard to know which one of the various versions of the
type I was using at any given time. That is why I think it would be nice if you
could do something like:

ptype/l variable and it would print the declaration file and line number in
addition to the normal output of ptype.

I do not have any particular attachment to /l in particular, I was thinking
"declaration location" 'l' for location but it could be 'd' for declaration or
something else that makes sense to people.

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