Log Message:
Update to 1.5.5, change maintainer to pkgsrc-users. Changes since 1.4.3:

Changes between version 1.5.4 and version 1.5.5

  * platform support: - SunOS: bug reports and patches from Richard Lowe
    in sb-posix tests (#1837495), sb-concurrency tests (#1837817),
    unencapsulated tracing (#1837307), float registers in interrupt
    contexts (#1837168)
  * bug fix: do not generate version.lisp-expr from git describe if the
    git repository is not sbcl's own. (#1836663, thanks to Richard Lowe)
  * bug fix: compiler crash related to VALUES-LIST on a &REST argument in
    some contexts. (#1836096, reported by Samuel Jimenez)
  * bug fix: compiler hang related to constraint propagation. (#1835599,
    reported by Mark Cox)
  * bug fix: the inspector showed the wrong array element type. (#1835934,
    reported by Richard M Kreuter)
  * optimization:  numerous improvements to hash table access and rehashing
  * optimization: ASSERT compiles into substantially more compact code.
    (#1835221)

Changes between version 1.5.3 and version 1.5.4

  * minor incompatible change: hash tables on 64-bit machines consume roughly
    20% less memory but can only grow to hold 2^31 entries (theoretically)
    due to use of 31-bit indices internally.
  * platform support: - RISC-V: improve rotate-byte support (thanks to Philipp
    Matthias Schaefer)
  * bug fix: the system reasons more correctly regarding the array rank of
    complicated array types. (reported by Bart Botta)
  * bug fix: DOUBLE-FLOAT-P never gets weaked to NUMBERP. (reported by Bart
    Botta)
  * enhancement: the regression test suite can now benefit from paralellism,
    completing much faster when enough compute power is available.
  * optimization: readtables with non-base-char dispatch characters are less
    inefficient.
  * optimization: INTERN performs fewer redundant type checks.
  * optimization: tests for PATHNAMEP and STRUCTURE-OBJECT (including in
    computing hash functions) are faster.

Changes between version 1.5.2 and version 1.5.3

  * platform support: - RISC-V: numerous bug fixes and improvements - all
    platforms: better run-program performance when used from multiple threads.
  * enhancement: (declaim (optimize (debug 2))) ensures compilation of
    top-level forms, providing better debugging for simple forms that are
    otherwise "byte-code interpreted" when compiled into FASLs.
  * bug fix: use of finalizers could in rare circumstances cause a crash in
    the garbage collector.
  * bug fix: show extended function designators, e.g. (setf foo), in the
    disassembler
  * optimization: reduced overhead of calling NTH/NTHCDR.
  * optimization: improved FLOAT-SIGN on DOUBLE-FLOATs on 64-bit platforms

Changes between version 1.5.1 and version 1.5.2

  * enhancement: RISC-V support with the generational garbage collector.
  * enhancement: command-line option "--tls-limit" can be used to alter
    the maximum number of thread-local symbols from its default of 4096.
  * enhancement: better muffling of redefinition and lambda-list warnings
  * platform support: - OS X: use Grand Central Dispatch semaphores, rather
    than Mach semaphores - Windows: remove non-functional definition of
    make-listener-thread
  * new feature: decimal reader syntax for rationals, using the R exponent
    marker and/or *READ-DEFAULT-FLOAT-FORMAT* of RATIONAL.
  * optimization: various Unicode tables have been packed more efficiently

Changes between version 1.5.0 and version 1.5.1

  * enhancement: restarts for missing package errors.
  * optimization: FIND-PACKAGE should be faster even when run in the context
    of a package with local package-nicknames.
  * optimization: fix TRUNCATE deftransform's results to have well-defined
    signs
  * bug fix: thread-safety problems in RUN-PROGRAM with :PTY.
  * bug fix: SLEEP transform could never fire.
  * build enhancement: defend against quirky host floating point implementation
  * test enhancement: allow more parallelism in running the regression test
    suite

Changes between version 1.4.16 and version 1.5.0

  * enhancement: SB-COVER emulates IN-PACKAGE when recording source maps;
    this makes it possible to generate coverage for forms that uses local
    package nicknames, or otherwise must be read in the correct package.
  * build enhancement: new host quirks mechanism, support for building
    under ABCL and ECL (as well as CCL, CMUCL, CLISP and SBCL itself)
  * optimization: (FIND-SYMBOL x "P") for constant "P" \ 
executes faster,
    subject to "P" not being a package-local nickname of any package.
    Similarly INTERN. (#1814924)
  * optimization: bounds checks are elided when possible where the same
    array is dereferenced multiple times.
  * bug fix: initargs are now deduplicated when computing effective slots.
  * bug fix: TREE-EQUAL with :TEST 'EQL now correctly computes its answer.
    (reported by Bahodir Mansurov)
  * bug fix: compiled (COERCE x 'FLOAT) no longer coerces double-floats into
    single-floats. (reported by J. Gareth Williams)

Changes between version 1.4.15 and version 1.4.16

  * minor incompatible change: ENSURE-DIRECTORIES-EXIST no longer
    establishes a CONTINUE restart in case of an error.
  * minor incompatible change: Defining macros (DEFVAR, etc) which require
    a symbol as the name will fail to macroexpand if given a non-symbol.
  * enhancement: the unexported restart names SB-{ALIEN,FASL,IMPL,PCL}::RETRY
    have been replaced by SB-EXT:RETRY.

Changes between version 1.4.14 and version 1.4.15

  * enhancement: added AVX2 instructions on x86-64, which can be used with
    SB-SIMD-PACK.
  * enhancement: specializer name parsing is less lenient and signals a
    specific condition in case of syntax errors. (#1808681)
  * enhancement: provide interactive restarts for some file-system errors.
  * enhancement: COMPILE no longer acquires the world lock. (fixes most
    occurrences of #308959)
  * bug fix: RUN-PROGRAM is more responsive and less likely to deadlock
    (#1702178, #1808641)
  * bug fix: traceroot can search for simple-fun targets (#1808659,
    reported by Michal Herda)
  * compiler bug fixes:
        related to code generation: #1805899, #1806982, #1807455
        related to interpreting and constant-folding: #1806513
        related to the type system: #1804759, #1804796
        related to eq-testing of structure slots: #1809582, #1808273
        related to dynamic-extent: #1809565, #1809253, #1809485, #1739652
        related to GC safety: #308949

Changes between version 1.4.13 and version 1.4.14

  * enhancement: attempting to build on openbsd 6.0 or newer without the
    wxallowed mount option now results in a more useful error message.
  * enhancement: by popular demand, SB-EXT now exports two functions
    HEAP-ALLOCATED-P and STACK-ALLOCATED-P to assist in writing debug
    assertions that objects in hash-tables are not stack-allocated, etc.
  * bug fix: restored sb-thread support on OpenBSD.

Changes between version 1.4.12 and version 1.4.13

  * minor incompatible change: PRINT-TYPE and PRINT-TYPE-SPECIFIER are not
    exported from SB-EXT. These were never announced, so this change would
    only affects users who discovered these undocumented functions.
  * enhancement: SB-EXT:SEARCH-ROOTS and SB-EXT:GC-AND-SEARCH-ROOTS are
    supported on all backends that use gencgc.

Changes between version 1.4.11 and version 1.4.12

  * minor incompatible change: a number of platform-specific elements of
    *FEATURES* related to whether the system implements particular
    strategies have been removed.
  * minor incompatible change: some changes to the (internal) implementation
    details of the x86 and x86-64 have necessitated changes to some
    low-level libraries.
  * enhancement: attempting to transfer control through GO or RETURN-FROM
    to frames which no longer exist are now caught and handled by the debugger.
  * enhancement: identical code (at the machine instruction level) can now
    be shared between functions, if explicitly requested.
  * enhancement: SB-EXT:STRING-TO-OCTETS and SB-EXT:OCTETS-TO-STRING are
    now documented.
  * bug fixes: fix a number of bugs revealed by random testing (#1793171,
    #1793150, #1791550, #1792030, #1791059, #1790157, #1790717, #1790703)

Changes between version 1.4.10 and version 1.4.11

  * minor incompatible change: changes to the (internal) assembler on x86
    and x86-64 may cause problems to some low-level third-party libraries:
    	new macro EA for defining an effective address, without size
	information;
        an explicit size modifier is now needed for MOVSX and MOVSZ
	instructions;
        MOVD and MOVQ move a single size of operand by definition.
  * enhancement: support the latest MinGW (#1786731, reported by il71)
  * enhancement: checks for modifications of constants can now be done in
    local (FLET/LABELS) functions.
  * optimization: improved type checking routines for various compound types.
  * optimization: array bound checks are elided on vectors when the index
    is known to be less than the length, including LOOP ACROSS.
  * optimization: the register allocator's use of temporaries is somewhat
    improved.
  * optimization: checking widetags involves fewer conditional jumps on x86
    and x86-64.
  * bug fix: fix a number of bugs related to constant improper lists as
    sequence arguments (#1768563, #1768568, #1768652)

Changes between version 1.4.9 and version 1.4.10

  * enhancement: added SB-EXT:MAKE-WEAK-VECTOR.
  * enhancement: constant-modification detection warnings can be generated
    in the presence of conditional constructs.
  * optimization: better bounds-checking on x86[-64] and ARM64.
  * optimization: adding 1 to or subtracting 1 from a fixnum variable does
    not cons.
  * bug fixes: fix a number of bugs revealed by random testing (#1782826,
    #1779878, #1779737)

Changes between version 1.4.8 and version 1.4.9

  * enhancement: SB-COVER instrumentation for x86[-64] has signficantly
    less overhead. The performance penalty for 64-bit code has been
    measured at around 30% slower than uninstrumented code as contrasted
    with slowdowns in excess of 100% previously.
  * enhancement: tracing a generic function with the :METHODS T option
    produces output corresponding to each method called under the default
    :ENCAPSULATE NIL tracing implementation.
  * bug fix: updated TRACE documentation. (#574614 was actually already
    fixed, but there were other issues.)
  * bug fix: fixed x86 GC bug causing heap corruption. (#1749369)
  * bug fix: improved compatibility with macOS High Sierra and graphical
    applications.

Changes between version 1.4.7 and version 1.4.8

  * bug fix: redefinition of method combinations now does the expected
    thing; generic functions using that method combination have their
    effective methods lazily recomputed according to the new definition
    of the method combination. (Reported by Didier Verna at ELS 2018)
  * bug fix: :arguments argument to the long form of DEFINE-METHOD-COMBINATION
    is now implemented more correctly, supporting suppliedp variables and
    &optional defaults. (Reported by Bruno Haible, #309084)

Changes between version 1.4.6 and version 1.4.7

  * enhancement: better handling of unknown keyword arguments (#1750466)
  * enhancement: namestrings can now be computed for certain pathnames
    that previously did not have namestrings because of #\. characters
    in their name and/or type components.
  * bug fix: compiling a SLEEP call with a float positive infinity
    argument no longer causes an internal error (#1754081)
  * bug fix: keyword arguments provided to a generic function with
    EQL-specialized methods are checked more correctly (reported by
    Syll, #1760987)

Changes between version 1.4.5 and version 1.4.6

  * enhancement: DISASSEMBLE on a symbol naming a macro will
    disassemble the expander, not the code that traps attempted
    FUNCALL of the macro.
  * enhancement: The sb-sprof contrib now provides an experimental
    interface for accessing collected profiler data.
  * enhancement: The instruction-level profiling of the sb-prof contrib
    annotates the disassembler output more efficiently.
  * optimization: improved dynamic-extent handling of nested variables.

Changes betweenNew in version 1.4.5

  * minor incompatible change: building with/without the :sb-package-locks
    feature is no longer an option. Package locks are always compiled in,
    and removing :sb-package-locks from *features* will have no effect.
  * enhancement: FIND-PACKAGE does not acquire a mutex
  * enhancement: cheneygc can perform heap relocation on startup
  * enhancement: in threaded builds, finalizers execute in a system-internal
    thread so that a user thread which invokes GC is unblocked from
    performing work as soon it returns from GC and invokes any post-GC hooks.
    As such, it is more important than before to avoid assumptions about
    special variable bindings in finalizers, even in single-threaded code.
  * optimization: faster (funcall (or function symbol)) on x86-64.

Changes between version 1.4.3 and version 1.4.4

  * bug fix: pathname accessors such as PATHNAME-DIRECTORY work on
    SYNONYM-STREAMs.
  * bug fix: (pathname-{device,directory,name,type} ... :case :common) works
    as expected. In particular MAKE-PATHNAME composed with the accessors
    roundtrips properly when both use the same :case. (#1739906)
  * bug fix: DIRECTORY no longer gets confused when the value of
    *DEFAULT-PATHNAME-DEFAULTS* has a name or type component. (#1740563)
  * bug fix: pattern pieces in pathname components are correctly
    escaped during unparsing.
  * bug fix: DELETE-DIRECTORY no longer signals an error when the
    directory is supplied as a pathname with name and/or type
    components containing escaped characters. (#1740624)
  * bug fix: weak hash-tables no longer cause GC time to scale
    superlinearly (#1241771)
  * bug fix: CANCEL-FINALIZATION operates in approximately constant
    time per operation (#1587983)
  * bug fix: big-endian MIPS systems now (mostly) work again (broken
    since 1.3.14.x).
  * bug fix: backtrace from arg-count errors on systems other than x86,
    x86-64, ARM, and ARM64 now works again.
  * bug fix: backtrace from asynchronous interrupts on non-x86,
    non-x86-64 systems should now be more reliable.
  * enhancement: warnings and errors referring to bindings established by
    LET, LET*, FLET and LABELS point to the offending form more accurately.
  * enhancement: backtrace for invalid argument count produces the
    exact supplied arguments including the extra ones on all platforms
    (no longer just x86, x86-64, ARM, and ARM64).