* msdos/sed2v2.inp (ALIGNOF_EMACS_INT): Define to 4.

* msdos/sedlibmk.inp (OMIT_GNULIB_MODULE_fchmodat)
(OMIT_GNULIB_MODULE_issymlinkat, OMIT_GNULIB_MODULE_issymlink)
(OMIT_GNULIB_MODULE_lchmod): Define to true.

* src/gmalloc.c (__morecore, __after_morecore_hook)
(__malloc_initialize_hook): Don't declare till stddef.h has been
included for `ptrdiff_t'.

* doc/misc/eglot.texi (Eglot Features): Add comma after @xref.

* msdos/sed2v2.inp (GNULIB_ISSYMLINK): Define to 1.

* msdos/sedlibmk.inp (HAVE_RANDOM_H): Undefine, in line with its
deletion from gnulib.mk.
(GL_GNULIB_STRINGEQ): Define to 1.

* src/msdos.c (careadlinkat): NULL terminate at the end of the
data written, not one character beyond the same.

* msdos/sedlibmk.inp (NEXT_AS_FIRST_DIRECTIVE_STDCKDINT_H)
(NEXT_STDCKDINT_H): Define to presumably unused values.

* msdos/emacs.djl (.bss): Guarantee that lread.o is 8-byte
aligned.

* msdos/sed2v2.inp (ALIGNOF_INT, ALIGNOF_LONG)
(ALIGNOF_LONG_LONG): Correct typos.

* src/term.c (tty_free_frame_resources): Synchronize with
non-DOS variant.

* configure.ac (ALIGNOF_INT, ALIGNOF_LONG, ALIGNOF_LONG_LONG):
New variables.
(emacs_cv_alignas_unavailable): Define if alignas and structure
alignment primitives are unavailable.  In such an environment,
the MSB tagging scheme must be enabled, as must the GNU malloc.

* msdos/sed2v2.inp: Adjust correspondingly.

* src/alloc.c (union emacs_align_type): Remove types which
contain flexible array members.  The address of a field
subsequent to an aggregate with flexible array members cannot
validly be taken.
(mark_memory) [!USE_LSB_TAG && !WIDE_EMACS_INT]: Strip type bits
before scanning memory.

* src/emacs.c (main):

* src/eval.c (Fautoload_do_load):

* src/fns.c (Frequire): Rename a number of illogically named
fields.

* src/lisp.h (ALIGNOF_EMACS_INT): Define to the natural
alignment of EMACS_INT.
(IDEAL_GCALIGNMENT): New macro.
(USE_LSB_TAG): Disable if no alignment specifiers are available,
WIDE_EMACS_INT is undefined, and the natural alignment of
EMACS_INT falls short of LSB tagging's requirements.
(gflags): Rename illogically named fields and don't define them
as bitfields, which runs afoul of certain compiler issues.
(will_dump_p, will_bootstrap_p, will_dump_with_pdumper_p)
(dumped_with_pdumper_p): Adjust accordingly.

* src/pdumper.c (VM_SUPPORTED): Define to 0 when !USE_LSB_TAG.
It is better to read dump files into the heap by hand than to be
supplied with an address that is not representable.
(_dump_object_start_pseudovector): Rename to
dump_object_start_pseudovector, to avoid encroaching on reserved
names.
(START_DUMP_PVEC): Adjust correspondingly.
(dump_mmap_contiguous_vm): Preserve errno around failure
cleanup.
(dump_bitset_bit_set_p): Work around certain compiler issues.
(pdumper_load) [!USE_LSB_TAG]: Reject dump file allocations
that are not representable as Lisp_Objects.

Tested on i386-unknown-solaris2.10, sparc-sun-solaris2.10.

* config.bat (mvOk): Protoize.
(djgppOk): Include sys/version.h for _DJGPP_MINOR.

* lisp/loadup.el: If system-type is ms-dos, dump bootstrap-emacs
as b-emacs.dmp.

* msdos/INSTALL: Document new versions of tools that have been
verified successfully to compile Emacs.

* msdos/emacs.djl: New linker script that arranges to link
symbols in `.subrs' in a contiguous part of data, as the DJGPP
runtime appears to treat any non-data and non-text section as
allocatable.

* msdos/mainmake.v2 (install): Install emacs.dmp alongside
emacs.exe.

* msdos/sed1v2.inp (CFLAGS): Define to -O2 -g3.
(LDFLAGS): Provide the said linker script.
(HAVE_PDUMPER): Define to yes.
(UNEXEC_OBJ, PAXCTL_dumped, PAXCTL_notdumped): Delete.
(DUMPING): Set to pdumper.
(MAKE_PDUMPER_FINGERPRINT): Don't erase this variable.
Don't stubify or set minstack.  Remove native-comp specific
directives.  Don't remove temacs prior to copying and replace
`pdmp' extension with DOS-conformant `dmp'.

* msdos/sed2v2.inp (HAVE_UNEXEC): Remove definition.
(HAVE_PDUMPER): Define to 1.

* msdos/sed6.inp (top_srcdir): Define appropriately.

* msdos/sedlibmk.inp (HAVE_BLKCNT_T): Define to 1.

* src/emacs.c (load_pdump) [MSDOS]: Use `dmp' suffix.

* src/pdumper.c (Fdump_emacs_portable) [MSDOS]: Replace ".pdmp"
suffixes with ".dmp".

* msdos/sedlibmk.inp: Adapt to new GNulib module names.