[Bug corefiles/22795] Variables in the .bss section are printed as 32-bit

["byron.c.hawkins at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22795

--- Comment #2 from Byron Hawkins <byron.c.hawkins at gmail dot com> ---
If the type of the __environ variable is not known, then why does GDB assume
type "int *" and dereference the pointer? I can suggest two reasonable options:

1. print the address of __environ as a "void *" unless it knows the specific
type of the variable. 
2. respond with an error "attempt to dereference a generic pointer", since the
user did ask for the variable's value without providing a type. 

But casting the pointer to an arbitrarily chosen type is totally confusing. How
can the user figure out that "char **__environ" has been cast to "int *"? There
is nothing in the program to suggest that __environ should refer to any int
anywhere, and there is nothing in the output to suggest that the printed value
was truncated at 4 bytes (i.e., it is indistinguishable from an 8-byte type
because leading zeros are omitted). 

If it is really necessary to presume a type, GDB should at the very least print
what it is doing:

    Variable '__environ' has unknown type: assuming 'int *'

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