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* etc/DEBUG: Modernize for AddressSanitizer etc.
* etc/NEWS: Defer to etc/DEBUG for this.

It doesn’t work anymore, and these days ‘gcc -fsanitize=address’
does a better job anyway.
* configure.ac: Remove the option.
* configure.ac (ac_xmalloc_overrun, XMALLOC_OVERRUN_CHECK):
* src/alloc.c (XMALLOC_OVERRUN_CHECK_OVERHEAD)
(XMALLOC_OVERRUN_CHECK_SIZE, XMALLOC_OVERRUN_SIZE_SIZE)
(xmalloc_overrun_check_header, xmalloc_overrun_check_trailer)
(xmalloc_put_size, xmalloc_get_size, overrun_check_malloc)
(overrun_check_realloc, overrun_check_free):
Remove.  All uses removed.
* etc/NEWS: Mention this.

* configure.ac: Remove the option.
* configure.ac (ac_gc_check_cons_list, GC_CHECK_CONS_LIST):
* src/alloc.c (check_cons_list) [GC_CHECK_CONS_LIST]:
* src/lisp.h (lisp_h_check_cons_list, check_cons_list):
Remove.  All uses removed.
* etc/NEWS: Mention this.

Because XPNTR now uses ATTRIBUTE_NO_SANITIZE_UNDEFINED,
it can be simplified.
* src/alloc.c (macro_PNTR_ADD, PNTR_ADD, macro_XPNTR): Remove.
(XPNTR): Open-code rather than using the removed macros and
functions.  Also, simplify by using LISP_WORD_TAG.

* src/pdumper.c (dump_charset): Use alignof (struct charset),
not alignof (int), since struct charset might be more strictly
aligned than int.  I think this is just a minor performance
issue, but we might as well use the correct alignment.
(drain_reloc_list): Use an alignment instead of a size for the
output alignment.  This prevents undefined behavior when
alignof (struct emacs_reloc) == 8 and sizeof (dump_off) == 4
when building on x86-64 with gcc -fsanitize=undefined.

* src/pdumper.c (dump_bitset_clear):
Pacify -fsanitize=undefined by avoiding memset (NULL, x, 0),
which strictly speaking has undefined behavior although it
works on all production platforms I know.

* src/alloc.c (XPNTR): Add ATTRIBUTE_NO_SANITIZE_UNDEFINED and
remove ATTRIBUTE_UNUSED.  Do not define as a macro, so that
ATTRIBUTE_NO_SANITIZE_UNDEFINED works.
* src/lisp.h (lisp_h_XSYMBOL): Remove.  All uses removed.
With recent GCC the macro does not work with -fsanitize=undefined,
and the macro can be omitted as its only function is to optimize -O0.

* lisp/emacs-lisp/unsafep.el: Move side-effect-free property setting
from here...
* lisp/subr.el: ...to here, as function declarations for modularity.

Revert the double-free bug that I introduced in
2019-03-11T15:20:54Z!eggert@cs.ucla.edu.
* src/pdumper.c (dump_mmap_reset): Do not free the private member;
that’s the release function’s job.
(dump_mm_heap_cb_release): Free cb if its refcount goes to zero.
(dump_mmap_contiguous_heap): Mention memory leak in comment.

9d7e08dd (origin/emacs-26) Avoid false positives and false negatives o...
75b589c7 Fix markup related to quoting in Info
fd6ff295 Merge branch 'emacs-26' of git.savannah.gnu.org:/srv/git/emac...
cd2204f0 Add a package: line to c-submit-bug-report.
a992dcab ; Remove empty NEWS sections
ea672707 ; Add NEWS sections for 26.3
45b09460 ; Bump Emacs version to 26.2.50
aae8cc33 * admin/admin.el (set-version): Add NEWS headers for a .50 ve...

The following commit was skipped:

bacdaa5b Use pkg-config to find lcms2 CFLAGS and LIBS (Bug#30346)

cd2204f0 Add a package: line to c-submit-bug-report.
a992dcab ; Remove empty NEWS sections
ea672707 ; Add NEWS sections for 26.3

Conflicts:
	etc/NEWS

The following commit was skipped:

45b09460 ; Bump Emacs version to 26.2.50

aae8cc33 * admin/admin.el (set-version): Add NEWS headers for a .50 ve...

The following commit was skipped:

f90a3360 Backport doc improvement in ELisp manual

037970f1 Document insert-image-file's return value (Bug#32978)
598b45ad Autoload cua-toggle-rectangle-mark (Bug#34947)
95bd56df Tell xclip not to expect job-control under eshell (Bug#35257)
9997bbb3 ; * src/emacs.c: Fix typo in comment (Bug#35320).
a4ad7bed Fix off-by-one-link error in image--set-property

* lisp/info.el (Info-mode-font-lock-keywords): Modify the regexp, for
matching single quotes of opening single quote and closing single
quote, and avoid matching text followed by a curly quote when it is
not quoting. (Bug#35202)

* doc/misc/sc.texi (Citations): Fix markup of '>'.
* doc/misc/mh-e.texi (Speedbar): Fix markup in a @table.
* doc/misc/calc.texi (Yacas Language Mode): Fix a typo.
* doc/emacs/mark.texi (Setting Mark): Remove duplicate
quoting.  (Bug#35202)

* configure.ac: Use EMACS_CHECK_MODULES fors LCMS2 rather than
AC_SEARCH_LIBS.
* src/Makefile.in: Get LCMS2_LIBS and LCMS2_CFLAGS from configure,
instead of just LIBLCMS2.

(cherry picked from commit cb386337)

* lib-src/make-fingerprint.c (buf): Now static,
to pacify LeakSanitizer.

(sql-product-alist): Added :prompt-cont-regexp for ms.

Looking for experience with Microsofts SQLCMD interpreter and
adjustments needed for Emacs to support it.

(sql-interactive-remove-continuation-prompt): Properly protect `sql-prompt-cont-regexp'.
(sql-interactive-mode): Same.

(sql-product-alist): Corrected :terminator defns.
(sql-debug-send): New variable.
(sql-send-string): Use it and correct buffer context.
(sql-send-magic-terminator): Use `sql-input-sender'.
(sql-placeholders-filter): Bug#11481 Don't recursively replace placeholders
* test/lisp/progmodes/sql-tests.el
(sql-test-placeholder-filter): Test placeholder functionality.

* lwlib/lwlib-Xaw.c (get_text_width_and_height) [HAVE_XFT]:
* lwlib/xlwmenu.c (string_width) [HAVE_XFT]: Use xOff member instead of width.

* lisp/vc/log-edit.el (log-edit--toggle-amend): Extract from
vc-git-log-edit-toggle-amend (bug#34944).

* lisp/vc/vc-hg.el (vc-hg-log-edit-toggle-amend): New function.
Use the aforementioned.
(vc-hg-log-edit-mode-map): New variable.
(vc-hg-log-edit-mode): New major mode.

* test/lisp/progmodes/flymake-tests.el (different-diagnostic-types):
Expect also failure on emba.gnu.org.

* lisp/progmodes/cc-mode.el (c-submit-bug-report):
Add a Package: line for mail clients that do not support X- headers.

* lib-src/emacsclient.c (set_local_socket):
If there appears to be an XDG runtime directory for the user
but XDG_RUNTIME_DIR is unset, suggest setting it while warning
about potential security issues (Bug#35300).

* lisp/progmodes/cc-engine.el (c-forward-sws, c-backward-sws): Recognize
matches of c-doc-line-join-re as syntactic whitespace.
(c-find-decl-prefix-search): Recognize and move over matches of
c-doc-line-join-re as whitespace.
(c-find-decl-spots): Before moving backward a char, check (bobp).  Before
moving forward over a comment, check it isn't possibly a "bright" comment.

* lisp/progmodes/cc-fonts.el (c-get-doc-comment-style): New function,
extracted from c-compose-keywords-list.
(c-compose-keywords-list): Call the above new function.
(pike-font-lock-keywords, pike-font-lock-keywords-2)
(pike-font-lock-keywords-3): Call c-set-doc-comment-res.
(c-doc-line-join-re, c-doc-bright-comment-start-re, c-doc-line-join-end-ch):
New variables.
(c-set-doc-comment-re-element, c-set-doc-comment-char-list): New macros.
(c-set-doc-comment-res): New function.
(c-font-lock-doc-comments): For consistency and repeatability, in a sequence
of C++ style doc comments, don't fontify the region between BOL and the
comment marker.
(autodoc-line-join-re, autodoc-bright-comment-start-re)
(autodoc-line-join-end-ch): New variables.

* lisp/progmodes/cc-mode.el (c-doc-fl-decl-start, c-doc-fl-decl-end): New
functions.
(c-change-expand-fl-region, c-context-expand-fl-region): Call the above two
new functions for extra possibilities for the start and end of a construct.

* doc/misc/cc-mode.texi (Doc Comments): Add a sentence drawing attention to
the possibility of fontifying constructs within a doc comment.

* doc/lispref/processes.texi (Accepting Output): Backport:
document how do avoid race conditions while waiting for all of
the process's output to arrive.

Make it so the comment-continue is aligned with the comment-start when
comment-start is a single-char.

* src/ftfont.h (struct font_info): New member bitmap_strike_index.
* src/ftfont.c (ftfont_open2): Try bitmap strikes as fallbacks.
(ftfont_open): Discard bitmap strikes.
* src/ftcrfont.c (ftcrfont_open): Recalculate metrics for bitmap strikes.
(ftcrfont_get_bitmap, ftcrfont_anchor_point, ftcrfont_shape): New functions.
(struct font_driver): Use them.