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Changes in version 1.8:
A buffer overflow has been fixed in zcat which happened sometimes when
the '-v, --show-nonprinting' option was used (or indirectly enabled).
A canary byte has been added to the output buffer to prevent the buffer
overflow from happening again.
The option '-R, --dereference-recursive', which recursively follows
symbolic links, has been added to zcat, zgrep, ztest and zupdate.
The option '-r, --recursive' now skips symlinks that are encountered
recursively.
If no files are given to zcat, zgrep, ztest and zupdate, a recursive
search will now examine the current working directory.
Recursive directory loops are now detected.
zcat and zgrep now ignore directories given in the command line if
'--recursive' is not specified, instead of reporting an error.
Extra trailing slashes are now removed from directories given in the
command line before recursing into them.
zcat and zgrep now show the right error when they can't open an input
file instead of showing "No such file or directory".
Killed decompressors are now waited for, preventing failure caused by
too many open pipes.
Test and document that if a file fails to decompress, zcat, zgrep and
ztest continue processing the rest of the files.
Test and document that if an error happens while recompressing a file,
zupdate exits immediately without recompressing the rest of the files.
The configure script now accepts appending options to CXXFLAGS using the
syntax 'CXXFLAGS+=OPTIONS'.
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