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Obsolete Conditionals

Fragments of old code in GDB sometimes reference or set the following configuration macros. They should not be used by new code, and old uses should be removed as those parts of the debugger are otherwise touched.

STACK_END_ADDR

This macro used to define where the end of the stack appeared, for use in interpreting core file formats that don't record this address in the core file itself. This information is now configured in BFD, and GDB gets the info portably from there. The values in GDB's configuration files should be moved into BFD configuration files (if needed there), and deleted from all of GDB's config files.

Any `foo-xdep.c' file that references STACK_END_ADDR is so old that it has never been converted to use BFD. Now that's old!

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