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-@section File caching
-The file caching mechanism is embedded within BFD and allows
-the application to open as many BFDs as it wants without
-regard to the underlying operating system's file descriptor
-limit (often as low as 20 open files).  The module in
-@code{cache.c} maintains a least recently used list of
-@code{BFD_CACHE_MAX_OPEN} files, and exports the name
-@code{bfd_cache_lookup}, which runs around and makes sure that
-the required BFD is open. If not, then it chooses a file to
-close, closes it and opens the one wanted, returning its file
-handle.
-
-@findex BFD_CACHE_MAX_OPEN macro
-@subsubsection @code{BFD_CACHE_MAX_OPEN macro}
-@strong{Description}@*
-The maximum number of files which the cache will keep open at
-one time.
-@example
-#define BFD_CACHE_MAX_OPEN 10
-@end example
-
-@findex bfd_last_cache
-@subsubsection @code{bfd_last_cache}
-@strong{Synopsis}
-@example
-extern bfd *bfd_last_cache;
-@end example
-@strong{Description}@*
-Zero, or a pointer to the topmost BFD on the chain.  This is
-used by the @code{bfd_cache_lookup} macro in @file{libbfd.h} to
-determine when it can avoid a function call.
-
-@findex bfd_cache_lookup
-@subsubsection @code{bfd_cache_lookup}
-@strong{Description}@*
-Check to see if the required BFD is the same as the last one
-looked up. If so, then it can use the stream in the BFD with
-impunity, since it can't have changed since the last lookup;
-otherwise, it has to perform the complicated lookup function.
-@example
-#define bfd_cache_lookup(x) \
-    ((x)==bfd_last_cache? \
-      (FILE*) (bfd_last_cache->iostream): \
-       bfd_cache_lookup_worker(x))
-@end example
-
-@findex bfd_cache_init
-@subsubsection @code{bfd_cache_init}
-@strong{Synopsis}
-@example
-bfd_boolean bfd_cache_init (bfd *abfd);
-@end example
-@strong{Description}@*
-Add a newly opened BFD to the cache.
-
-@findex bfd_cache_close
-@subsubsection @code{bfd_cache_close}
-@strong{Synopsis}
-@example
-bfd_boolean bfd_cache_close (bfd *abfd);
-@end example
-@strong{Description}@*
-Remove the BFD @var{abfd} from the cache. If the attached file is open,
-then close it too.
-
-@strong{Returns}@*
-@code{FALSE} is returned if closing the file fails, @code{TRUE} is
-returned if all is well.
-
-@findex bfd_open_file
-@subsubsection @code{bfd_open_file}
-@strong{Synopsis}
-@example
-FILE* bfd_open_file (bfd *abfd);
-@end example
-@strong{Description}@*
-Call the OS to open a file for @var{abfd}.  Return the @code{FILE *}
-(possibly @code{NULL}) that results from this operation.  Set up the
-BFD so that future accesses know the file is open. If the @code{FILE *}
-returned is @code{NULL}, then it won't have been put in the
-cache, so it won't have to be removed from it.
-
-@findex bfd_cache_lookup_worker
-@subsubsection @code{bfd_cache_lookup_worker}
-@strong{Synopsis}
-@example
-FILE *bfd_cache_lookup_worker (bfd *abfd);
-@end example
-@strong{Description}@*
-Called when the macro @code{bfd_cache_lookup} fails to find a
-quick answer.  Find a file descriptor for @var{abfd}.  If
-necessary, it open it.  If there are already more than
-@code{BFD_CACHE_MAX_OPEN} files open, it tries to close one first, to
-avoid running out of file descriptors.
-