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This contains many changes from https://80x24.org/mwrap-perl.git
commit
* Built-in RCU-friendly version of dlmalloc, no more fragile dlsym(3m)
resolution of malloc-family functions in the constructor
* Allocations are now backed by O_TMPFILE on $TMPDIR on modern Linux.
Since mwrap increases memory usage greatly and I needed to use it
on a system where I needed more VM space but lacked the ability
to add swap.
* Configurable C backtrace level via MWRAP=bt:$DEPTH where $DEPTH
is a non-negative integer. Be careful about increasing it, even
a depth of 3-4 can be orders-of-magnitude more expensive in
time and space. This can be changed dynamically at runtime via
local HTTP (see below).
* Embedded per-process local-socket-only HTTP server obsoletes
MwrapRack when combined with mwrap-rproxy from the Perl dist
(set `MWRAP=socket_dir:/dir/of/sockets')
See https://80x24.org/mwrap-perl/20221210015518.272576-4-e@80x24.org/
for more info.
It now supports downloading CSV (suitable for importing into sqlite 3.32.0+)
* License switched to GPL-3+ to be compatible with GNU binutils
since we may take code from addr2line in the future.
* libxxhash supported if XXH3_64bits is available.
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