Enable interval expressions for --traditional. Update docs.

9 files changed, 655 insertions, 627 deletions

diff --git a/ChangeLog b/ChangeLog
index 711cd0ce..cde50c6f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,16 @@
 2022-02-22         Arnold D. Robbins     <arnold@skeeve.com>
 
+	Enable interval expressions even for --traditional, as BWK
+	awk has supported them since 2019.
+
+	* NEWS: Updated.
+	* main.c (main): Add lint warning for --re-interval.
+	(parse_args): Add explanatory comment.
+	* re.c (resetup): Update the comment w.r.t. interval expressions.
+	Change the test for enabled them to if do_traditional.
+
+2022-02-22         Arnold D. Robbins     <arnold@skeeve.com>
+
 	Fix resource links found by Coverity. Thanks to
 	Jakub Martisko <jamartis@redhat.com> for the report.
 
diff --git a/NEWS b/NEWS
index 5bf493e3..84513b95 100644
--- a/NEWS
+++ b/NEWS
@@ -24,6 +24,10 @@ Boolean. This is mainly for use with data exchange to/from languages
 or environments that support real Boolean values. See the manual
 for details.
 
+5. As BWK awk has supported interval expressions since 2019, they are
+now enabled even if --traditional is supplied. The -r/--re-interval option
+remains, but it does nothing.
+
 Changes from 5.1.1 to 5.1.2
 ---------------------------
 
diff --git a/doc/ChangeLog b/doc/ChangeLog
index 04bec844..1f535624 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,8 @@
+2022-02-22         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* awkcard.in: Update --re-interval description.
+	* gawktexi.in: Ditto, in all relevant places.
+
 2022-02-07         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* gawktexi.in (Indirect Calls): Expand discussion of calling
diff --git a/doc/awkcard.in b/doc/awkcard.in
index f83cec63..76ae9f27 100644
--- a/doc/awkcard.in
+++ b/doc/awkcard.in
@@ -304,8 +304,7 @@ The profile contains execution counts in the left margin.
 .TI "\*(FC\-P\*(FR, \*(FC\-\^\-posix\*(FR
 Disable common and GNU extensions.
 .TI "\*(FC\-r\*(FR, \*(FC\-\^\-re\-interval\*(FR
-Enable \*(FIinterval expressions\*(FR.
-(Needed with \*(FC\-c\*(FR.)\*(CB
+Does nothing; for backwards compatibility only.\*(CB
 .in -4n
 .EB "\s+2\f(HBCOMMAND LINE ARGUMENTS (\*(GK\f(HB)\*(FR\s0"
 
diff --git a/doc/gawk.info b/doc/gawk.info
index 0be3deca..f424ef99 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -2821,8 +2821,7 @@ The following list describes options mandated by the POSIX standard:
 '--re-interval'
      Allow interval expressions (*note Regexp Operators::) in regexps.
      This is now 'gawk''s default behavior.  Nevertheless, this option
-     remains (both for backward compatibility and for use in combination
-     with '--traditional').
+     remains for backward compatibility.
 
 '-s'
 '--no-optimize'
@@ -3993,9 +3992,8 @@ stand for themselves.
 
    As mentioned, interval expressions were not traditionally available
 in 'awk'.  In March of 2019, BWK 'awk' (finally) acquired them.
-Nonetheless, because they were not available for so many decades, 'gawk'
-continues to not supply them when in compatibility mode (*note
-Options::).
+Starting with version 5.2, 'gawk''s '--traditional' option no longer
+disables interval expressions in regular expressions.
 
    POSIX says that interval expressions containing repetition counts
 greater than 255 produce unspecified results.
@@ -4336,16 +4334,15 @@ No options
 
 '--traditional'
      Match traditional Unix 'awk' regexps.  The GNU operators are not
-     special, and interval expressions are not available.  Because BWK
-     'awk' supports them, the POSIX character classes ('[[:alnum:]]',
-     etc.)  are available.  Characters described by octal and
+     special.  Because BWK 'awk' supports them, the POSIX character
+     classes ('[[:alnum:]]', etc.)  are available.  So too, interval
+     expressions are allowed.  Characters described by octal and
      hexadecimal escape sequences are treated literally, even if they
      represent regexp metacharacters.
 
 '--re-interval'
-     Allow interval expressions in regexps, if '--traditional' has been
-     provided.  Otherwise, interval expressions are available by
-     default.
+     This option remains for backwards compatibility but no longer has
+     any real effect.
 
 
 File: gawk.info,  Node: Case-sensitivity,  Next: Regexp Summary,  Prev: GNU Regexp Operators,  Up: Regexp
@@ -35294,7 +35291,7 @@ Index
 * + (plus sign), += operator <1>:        Precedence.          (line  94)
 * , (comma), in range patterns:          Ranges.              (line   6)
 * - (hyphen), file names beginning with: Options.             (line  63)
-* - (hyphen), -- end of options marker:  Options.             (line 348)
+* - (hyphen), -- end of options marker:  Options.             (line 347)
 * - (hyphen), in bracket expressions:    Bracket Expressions. (line  25)
 * - (hyphen), -= operator:               Assignment Ops.      (line 129)
 * - (hyphen), -- operator:               Increment Ops.       (line  48)
@@ -35330,9 +35327,9 @@ Index
 * --include option:                      Options.             (line 180)
 * --lint option:                         Command Line.        (line  20)
 * --lint option <1>:                     Options.             (line 215)
-* --lint-old option:                     Options.             (line 338)
+* --lint-old option:                     Options.             (line 337)
 * --load option:                         Options.             (line 203)
-* --no-optimize option:                  Options.             (line 323)
+* --no-optimize option:                  Options.             (line 322)
 * --non-decimal-data option:             Options.             (line 248)
 * --non-decimal-data option <1>:         Nondecimal Data.     (line   6)
 * --non-decimal-data option, strtonum() function and: Nondecimal Data.
@@ -35344,7 +35341,7 @@ Index
 * --profile option:                      Options.             (line 283)
 * --profile option <1>:                  Profiling.           (line  12)
 * --re-interval option:                  Options.             (line 316)
-* --sandbox option:                      Options.             (line 328)
+* --sandbox option:                      Options.             (line 327)
 * --sandbox option, input redirection with getline: Getline.  (line  19)
 * --sandbox option, output redirection with print, printf: Redirection.
                                                               (line   6)
@@ -35355,7 +35352,7 @@ Index
 * --traditional option:                  Options.             (line  85)
 * --traditional option, --posix option and: Options.          (line 310)
 * --use-lc-numeric option:               Options.             (line 257)
-* --version option:                      Options.             (line 343)
+* --version option:                      Options.             (line 342)
 * -b option:                             Options.             (line  72)
 * -c option:                             Options.             (line  85)
 * -C option:                             Options.             (line  92)
@@ -35363,12 +35360,12 @@ Index
 * -D option:                             Options.             (line 111)
 * -e option:                             Options.             (line 120)
 * -E option:                             Options.             (line 146)
-* -e option <1>:                         Options.             (line 384)
+* -e option <1>:                         Options.             (line 383)
 * -f option:                             Long.                (line  12)
 * -F option:                             Options.             (line  21)
 * -f option <1>:                         Options.             (line  25)
-* -F option, -Ft sets FS to TAB:         Options.             (line 356)
-* -f option, multiple uses:              Options.             (line 361)
+* -F option, -Ft sets FS to TAB:         Options.             (line 355)
+* -f option, multiple uses:              Options.             (line 360)
 * -F option, command-line:               Command Line Field Separator.
                                                               (line   6)
 * -g option:                             Options.             (line 168)
@@ -35377,7 +35374,7 @@ Index
 * -I option:                             Options.             (line 197)
 * -l option:                             Options.             (line 203)
 * -l option <1>:                         Options.             (line 215)
-* -L option:                             Options.             (line 338)
+* -L option:                             Options.             (line 337)
 * -M option:                             Options.             (line 242)
 * -n option:                             Options.             (line 248)
 * -N option:                             Options.             (line 257)
@@ -35386,10 +35383,10 @@ Index
 * -p option:                             Options.             (line 283)
 * -P option:                             Options.             (line 295)
 * -r option:                             Options.             (line 316)
-* -s option:                             Options.             (line 323)
-* -S option:                             Options.             (line 328)
+* -s option:                             Options.             (line 322)
+* -S option:                             Options.             (line 327)
 * -v option:                             Options.             (line  36)
-* -V option:                             Options.             (line 343)
+* -V option:                             Options.             (line 342)
 * -v option <1>:                         Assignment Options.  (line  12)
 * -W option:                             Options.             (line  50)
 * . (period), regexp operator:           Regexp Operator Details.
@@ -35625,7 +35622,7 @@ Index
 * arguments, command-line <1>:           Auto-set.            (line  15)
 * arguments, command-line <2>:           ARGC and ARGV.       (line   6)
 * arguments, processing:                 Getopt Function.     (line   6)
-* ARGV array:                            Options.             (line 328)
+* ARGV array:                            Options.             (line 327)
 * ARGV array, indexing into:             Other Arguments.     (line  21)
 * arithmetic operators:                  Arithmetic Ops.      (line   6)
 * array manipulation in extensions:      Array Manipulation.  (line   6)
@@ -35997,6 +35994,8 @@ Index
 * built-in functions:                    Functions.           (line   6)
 * built-in functions, evaluation order:  Calling Built-in.    (line  30)
 * BusyBox Awk:                           Other Versions.      (line  92)
+* BWK awk, interval expressions in:      Interval Expressions.
+                                                              (line  27)
 * bytes, counting:                       Wc Program.          (line   6)
 * C library functions, assert():         Assert Function.     (line   6)
 * C library functions, getopt():         Getopt Function.     (line  15)
@@ -36197,7 +36196,7 @@ Index
 * cosine:                                Numeric Functions.   (line  15)
 * counting words, lines, characters, and bytes: Wc Program.   (line   6)
 * csh utility:                           Statements/Lines.    (line  45)
-* csh utility, POSIXLY_CORRECT environment variable: Options. (line 405)
+* csh utility, POSIXLY_CORRECT environment variable: Options. (line 404)
 * csh utility, |& operator, comparison with: Two-way I/O.     (line  27)
 * CSV (comma separated values) data, parsing with FPAT: Splitting By Content.
                                                               (line  20)
@@ -36579,7 +36578,7 @@ Index
 * effective group ID of gawk user:       Auto-set.            (line 172)
 * effective user ID of gawk user:        Auto-set.            (line 180)
 * Eggert, Paul:                          Interval Expressions.
-                                                              (line  36)
+                                                              (line  35)
 * egrep utility:                         Bracket Expressions. (line  34)
 * egrep utility <1>:                     Egrep Program.       (line   6)
 * egrep.awk program:                     Egrep Program.       (line  76)
@@ -36628,7 +36627,7 @@ Index
 * endpwent() user-defined function:      Passwd Functions.    (line 210)
 * English, Steve:                        Advanced Features.   (line   6)
 * ENVIRON array:                         Auto-set.            (line  59)
-* environment variables, POSIXLY_CORRECT: Options.            (line 390)
+* environment variables, POSIXLY_CORRECT: Options.            (line 389)
 * environment variables, used by gawk:   Environment Variables.
                                                               (line   6)
 * environment variables, AWKPATH:        AWKPATH Variable.    (line   6)
@@ -36997,7 +36996,7 @@ Index
 * gawk, awk and <1>:                     This Manual.         (line  14)
 * gawk, newlines in:                     Statements/Lines.    (line  12)
 * gawk, extensions, disabling:           Options.             (line 295)
-* gawk, version of, printing information about: Options.      (line 343)
+* gawk, version of, printing information about: Options.      (line 342)
 * gawk, ARGIND variable in:              Other Arguments.     (line  21)
 * gawk, PROCINFO array in:               Other Arguments.     (line  21)
 * gawk, escape sequences:                Escape Sequences.    (line 120)
@@ -37207,7 +37206,7 @@ Index
 * Hughes, Phil:                          Acknowledgments.     (line  43)
 * HUP signal, for dynamic profiling:     Profiling.           (line 217)
 * hyphen (-), file names beginning with: Options.             (line  63)
-* hyphen (-), -- end of options marker:  Options.             (line 348)
+* hyphen (-), -- end of options marker:  Options.             (line 347)
 * hyphen (-), in bracket expressions:    Bracket Expressions. (line  25)
 * hyphen (-), -= operator:               Assignment Ops.      (line 129)
 * hyphen (-), -- operator:               Increment Ops.       (line  48)
@@ -37431,7 +37430,7 @@ Index
 * lint checking, empty programs:         Command Line.        (line  16)
 * lint checking, issuing warnings:       Options.             (line 215)
 * lint checking, POSIXLY_CORRECT environment variable: Options.
-                                                              (line 390)
+                                                              (line 389)
 * lint checking:                         User-modified.       (line  90)
 * lint checking, array subscripts:       Uninitialized Subscripts.
                                                               (line  43)
@@ -37777,7 +37776,7 @@ Index
 * portability, #! (executable scripts):  Executable Scripts.  (line  29)
 * portability, ARGV variable:            Executable Scripts.  (line  55)
 * portability, backslash continuation and: Statements/Lines.  (line  30)
-* portability, POSIXLY_CORRECT environment variable: Options. (line 410)
+* portability, POSIXLY_CORRECT environment variable: Options. (line 409)
 * portability:                           Escape Sequences.    (line 103)
 * portability, backslash in escape sequences: Escape Sequences.
                                                               (line 108)
@@ -37854,7 +37853,7 @@ Index
 * POSIX awk, function keyword in:        Definition Syntax.   (line  99)
 * POSIX awk, changes in awk versions:    POSIX.               (line   6)
 * POSIX mode:                            Options.             (line 295)
-* POSIX mode <1>:                        Options.             (line 390)
+* POSIX mode <1>:                        Options.             (line 389)
 * POSIX mode <2>:                        Regexp Operator Details.
                                                               (line  47)
 * POSIX mode <3>:                        Input Summary.       (line  69)
@@ -37874,7 +37873,7 @@ Index
 * POSIX mode <12>:                       POSIX Floating Point Problems.
                                                               (line  83)
 * POSIX mode <13>:                       Feature History.     (line 315)
-* POSIXLY_CORRECT environment variable:  Options.             (line 390)
+* POSIXLY_CORRECT environment variable:  Options.             (line 389)
 * PREC variable:                         User-modified.       (line 126)
 * precedence, regexp operators:          Regexp Operator Details.
                                                               (line 137)
@@ -38158,7 +38157,7 @@ Index
                                                               (line  68)
 * sample debugging session:              Sample Debugging Session.
                                                               (line   6)
-* sandbox mode:                          Options.             (line 328)
+* sandbox mode:                          Options.             (line 327)
 * save debugger options:                 Debugger Info.       (line  85)
 * scalar or array:                       Type Functions.      (line  11)
 * scalar values:                         Basic Data Typing.   (line  13)
@@ -38780,572 +38779,572 @@ Node: Intro Summary118206
 Node: Invoking Gawk119090
 Node: Command Line120604
 Node: Options121402
-Ref: Options-Footnote-1139316
-Ref: Options-Footnote-2139547
-Node: Other Arguments139572
-Node: Naming Standard Input143583
-Node: Environment Variables144793
-Node: AWKPATH Variable145351
-Ref: AWKPATH Variable-Footnote-1148763
-Ref: AWKPATH Variable-Footnote-2148797
-Node: AWKLIBPATH Variable149168
-Ref: AWKLIBPATH Variable-Footnote-1150865
-Node: Other Environment Variables151240
-Node: Exit Status155192
-Node: Include Files155869
-Node: Loading Shared Libraries159559
-Node: Obsolete160987
-Node: Undocumented161679
-Node: Invoking Summary161976
-Node: Regexp164817
-Node: Regexp Usage166271
-Node: Escape Sequences168308
-Node: Regexp Operators174549
-Node: Regexp Operator Details175034
-Ref: Regexp Operator Details-Footnote-1182398
-Node: Interval Expressions182545
-Ref: Interval Expressions-Footnote-1184745
-Node: Bracket Expressions184843
-Ref: table-char-classes187319
-Node: Leftmost Longest190646
-Node: Computed Regexps191949
-Node: GNU Regexp Operators195376
-Node: Case-sensitivity199113
-Ref: Case-sensitivity-Footnote-1201979
-Ref: Case-sensitivity-Footnote-2202214
-Node: Regexp Summary202322
-Node: Reading Files203788
-Node: Records206057
-Node: awk split records207132
-Node: gawk split records211832
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-Ref: Full Line Fields-Footnote-1241448
-Ref: Full Line Fields-Footnote-2241494
-Node: Field Splitting Summary241595
-Node: Constant Size243669
-Node: Fixed width data244401
-Node: Skipping intervening247868
-Node: Allowing trailing data248666
-Node: Fields with fixed data249703
-Node: Splitting By Content251221
-Ref: Splitting By Content-Footnote-1255057
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-Node: FS versus FPAT256835
-Node: Testing field creation257995
-Node: Multiple Line259620
-Node: Getline265897
-Node: Plain Getline268366
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-Node: Output Summary343999
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-Node: Values347088
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+Ref: table-gawk-rounding-modes1009310
+Ref: Setting the rounding mode-Footnote-11013242
+Node: Arbitrary Precision Integers1013421
+Ref: Arbitrary Precision Integers-Footnote-11016596
+Node: Checking for MPFR1016745
+Node: POSIX Floating Point Problems1018219
+Ref: POSIX Floating Point Problems-Footnote-11022872
+Node: Floating point summary1022910
+Node: Dynamic Extensions1025100
+Node: Extension Intro1026653
+Node: Plugin License1027919
+Node: Extension Mechanism Outline1028716
+Ref: figure-load-extension1029155
+Ref: figure-register-new-function1030721
+Ref: figure-call-new-function1031814
+Node: Extension API Description1033877
+Node: Extension API Functions Introduction1035590
+Ref: table-api-std-headers1037426
+Node: General Data Types1041676
+Ref: General Data Types-Footnote-11050382
+Node: Memory Allocation Functions1050681
+Ref: Memory Allocation Functions-Footnote-11055182
+Node: Constructor Functions1055281
+Node: API Ownership of MPFR and GMP Values1058934
+Node: Registration Functions1060247
+Node: Extension Functions1060947
+Node: Exit Callback Functions1066269
+Node: Extension Version String1067519
+Node: Input Parsers1068182
+Node: Output Wrappers1080903
+Node: Two-way processors1085415
+Node: Printing Messages1087680
+Ref: Printing Messages-Footnote-11088851
+Node: Updating ERRNO1089004
+Node: Requesting Values1089743
+Ref: table-value-types-returned1090480
+Node: Accessing Parameters1091589
+Node: Symbol Table Access1092826
+Node: Symbol table by name1093338
+Ref: Symbol table by name-Footnote-11096363
+Node: Symbol table by cookie1096491
+Ref: Symbol table by cookie-Footnote-11100676
+Node: Cached values1100740
+Ref: Cached values-Footnote-11104276
+Node: Array Manipulation1104429
+Ref: Array Manipulation-Footnote-11105520
+Node: Array Data Types1105557
+Ref: Array Data Types-Footnote-11108215
+Node: Array Functions1108307
+Node: Flattening Arrays1112805
+Node: Creating Arrays1119781
+Node: Redirection API1124548
+Node: Extension API Variables1127381
+Node: Extension Versioning1128092
+Ref: gawk-api-version1128521
+Node: Extension GMP/MPFR Versioning1130253
+Node: Extension API Informational Variables1131881
+Node: Extension API Boilerplate1132954
+Node: Changes from API V11136928
+Node: Finding Extensions1138500
+Node: Extension Example1139059
+Node: Internal File Description1139857
+Node: Internal File Ops1143937
+Ref: Internal File Ops-Footnote-11155287
+Node: Using Internal File Ops1155427
+Ref: Using Internal File Ops-Footnote-11157810
+Node: Extension Samples1158084
+Node: Extension Sample File Functions1159613
+Node: Extension Sample Fnmatch1167262
+Node: Extension Sample Fork1168749
+Node: Extension Sample Inplace1169967
+Node: Extension Sample Ord1173593
+Node: Extension Sample Readdir1174429
+Ref: table-readdir-file-types1175318
+Node: Extension Sample Revout1176386
+Node: Extension Sample Rev2way1176975
+Node: Extension Sample Read write array1177715
+Node: Extension Sample Readfile1179657
+Node: Extension Sample Time1180752
+Node: Extension Sample API Tests1182504
+Node: gawkextlib1182996
+Node: Extension summary1185914
+Node: Extension Exercises1189616
+Node: Language History1190858
+Node: V7/SVR3.11192514
+Node: SVR41194666
+Node: POSIX1196100
+Node: BTL1197481
+Node: POSIX/GNU1198210
+Node: Feature History1203988
+Node: Common Extensions1221163
+Node: Ranges and Locales1222446
+Ref: Ranges and Locales-Footnote-11227062
+Ref: Ranges and Locales-Footnote-21227089
+Ref: Ranges and Locales-Footnote-31227324
+Node: Contributors1227547
+Node: History summary1233544
+Node: Installation1234924
+Node: Gawk Distribution1235868
+Node: Getting1236352
+Node: Extracting1237315
+Node: Distribution contents1238953
+Node: Unix Installation1246014
+Node: Quick Installation1246818
+Node: Compiling with MPFR1249238
+Node: Shell Startup Files1249928
+Node: Additional Configuration Options1251017
+Node: Configuration Philosophy1253332
+Node: Compiling from Git1255728
+Node: Building the Documentation1256283
+Node: Non-Unix Installation1257667
+Node: PC Installation1258127
+Node: PC Binary Installation1258965
+Node: PC Compiling1259838
+Node: PC Using1260955
+Node: Cygwin1264508
+Node: MSYS1265732
+Node: VMS Installation1266334
+Node: VMS Compilation1267053
+Ref: VMS Compilation-Footnote-11268282
+Node: VMS Dynamic Extensions1268340
+Node: VMS Installation Details1270025
+Node: VMS Running1272287
+Node: VMS GNV1276566
+Node: Bugs1277280
+Node: Bug definition1278192
+Node: Bug address1281128
+Node: Usenet1284516
+Node: Performance bugs1285705
+Node: Asking for help1288626
+Node: Maintainers1290593
+Node: Other Versions1291787
+Node: Installation summary1299951
+Node: Notes1301315
+Node: Compatibility Mode1302109
+Node: Additions1302891
+Node: Accessing The Source1303816
+Node: Adding Code1305253
+Node: New Ports1311445
+Node: Derived Files1315820
+Ref: Derived Files-Footnote-11321480
+Ref: Derived Files-Footnote-21321515
+Ref: Derived Files-Footnote-31322113
+Node: Future Extensions1322227
+Node: Implementation Limitations1322885
+Node: Extension Design1324095
+Node: Old Extension Problems1325239
+Ref: Old Extension Problems-Footnote-11326757
+Node: Extension New Mechanism Goals1326814
+Ref: Extension New Mechanism Goals-Footnote-11330178
+Node: Extension Other Design Decisions1330367
+Node: Extension Future Growth1332480
+Node: Notes summary1333086
+Node: Basic Concepts1334244
+Node: Basic High Level1334925
+Ref: figure-general-flow1335207
+Ref: figure-process-flow1335893
+Ref: Basic High Level-Footnote-11339195
+Node: Basic Data Typing1339380
+Node: Glossary1342708
+Node: Copying1374595
+Node: GNU Free Documentation License1412138
+Node: Index1437258
 
 End Tag Table
 
diff --git a/doc/gawk.texi b/doc/gawk.texi
index bfd1a00b..5881a3b8 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -4321,8 +4321,7 @@ Allow interval expressions
 (@pxref{Regexp Operators})
 in regexps.
 This is now @command{gawk}'s default behavior.
-Nevertheless, this option remains (both for backward compatibility
-and for use in combination with @option{--traditional}).
+Nevertheless, this option remains for backward compatibility.
 
 @item @option{-s}
 @itemx @option{--no-optimize}
@@ -6110,11 +6109,12 @@ When @samp{@{} and @samp{@}} appear in regexp constants
 in a way that cannot be interpreted as an interval expression
 (such as @code{/q@{a@}/}), then they stand for themselves.
 
+@cindex BWK @command{awk} @subentry interval expressions in
 As mentioned, interval expressions were not traditionally available
 in @command{awk}. In March of 2019, BWK @command{awk} (finally) acquired them.
-Nonetheless, because they were not available for
-so many decades, @command{gawk} continues to not supply them
-when in compatibility mode (@pxref{Options}).
+Starting with @value{PVERSION} 5.2, @command{gawk}'s
+@option{--traditional} option no longer disables interval
+expressions in regular expressions.
 
 POSIX says that interval expressions containing repetition counts greater
 than 255 produce unspecified results.
@@ -6678,16 +6678,15 @@ are allowed.
 @cindex Brian Kernighan's @command{awk}
 @item @option{--traditional}
 Match traditional Unix @command{awk} regexps. The GNU operators
-are not special, and interval expressions are not available.
-Because BWK @command{awk} supports them,
+are not special.  Because BWK @command{awk} supports them,
 the POSIX character classes (@samp{[[:alnum:]]}, etc.) are available.
+So too, interval expressions are allowed.
 Characters described by octal and hexadecimal escape sequences are
 treated literally, even if they represent regexp metacharacters.
 
 @item @option{--re-interval}
-Allow interval expressions in regexps, if @option{--traditional}
-has been provided.
-Otherwise, interval expressions are available by default.
+This option remains for backwards compatibility but no longer has any
+real effect.
 @end table
 
 @node Case-sensitivity
diff --git a/doc/gawktexi.in b/doc/gawktexi.in
index 66de1068..8ad59282 100644
--- a/doc/gawktexi.in
+++ b/doc/gawktexi.in
@@ -4231,8 +4231,7 @@ Allow interval expressions
 (@pxref{Regexp Operators})
 in regexps.
 This is now @command{gawk}'s default behavior.
-Nevertheless, this option remains (both for backward compatibility
-and for use in combination with @option{--traditional}).
+Nevertheless, this option remains for backward compatibility.
 
 @item @option{-s}
 @itemx @option{--no-optimize}
@@ -5838,11 +5837,12 @@ When @samp{@{} and @samp{@}} appear in regexp constants
 in a way that cannot be interpreted as an interval expression
 (such as @code{/q@{a@}/}), then they stand for themselves.
 
+@cindex BWK @command{awk} @subentry interval expressions in
 As mentioned, interval expressions were not traditionally available
 in @command{awk}. In March of 2019, BWK @command{awk} (finally) acquired them.
-Nonetheless, because they were not available for
-so many decades, @command{gawk} continues to not supply them
-when in compatibility mode (@pxref{Options}).
+Starting with @value{PVERSION} 5.2, @command{gawk}'s
+@option{--traditional} option no longer disables interval
+expressions in regular expressions.
 
 POSIX says that interval expressions containing repetition counts greater
 than 255 produce unspecified results.
@@ -6362,16 +6362,15 @@ are allowed.
 @cindex Brian Kernighan's @command{awk}
 @item @option{--traditional}
 Match traditional Unix @command{awk} regexps. The GNU operators
-are not special, and interval expressions are not available.
-Because BWK @command{awk} supports them,
+are not special.  Because BWK @command{awk} supports them,
 the POSIX character classes (@samp{[[:alnum:]]}, etc.) are available.
+So too, interval expressions are allowed.
 Characters described by octal and hexadecimal escape sequences are
 treated literally, even if they represent regexp metacharacters.
 
 @item @option{--re-interval}
-Allow interval expressions in regexps, if @option{--traditional}
-has been provided.
-Otherwise, interval expressions are available by default.
+This option remains for backwards compatibility but no longer has any
+real effect.
 @end table
 
 @node Case-sensitivity
diff --git a/main.c b/main.c
index c88c23a6..7d14c8bf 100644
--- a/main.c
+++ b/main.c
@@ -368,8 +368,12 @@ main(int argc, char **argv)
 		}
 	}
 
-	if (do_lint && os_is_setuid())
-		lintwarn(_("running %s setuid root may be a security problem"), myname);
+	if (do_lint) {
+		if (os_is_setuid())
+			lintwarn(_("running %s setuid root may be a security problem"), myname);
+		if (do_intervals)
+			lintwarn(_("The -r/--re-interval options no longer have any effect"));
+	}
 
 	if (do_debug)	/* Need to register the debugger pre-exec hook before any other */
 		init_debug();
@@ -1688,6 +1692,8 @@ parse_args(int argc, char **argv)
 			break;
 
 		case 'r':
+			// This no longer has any effect. It remains for the
+			// lint check in main().
 			do_flags |= DO_INTERVALS;
  			break;
 
diff --git a/re.c b/re.c
index fd134727..1e959373 100644
--- a/re.c
+++ b/re.c
@@ -478,10 +478,16 @@ resetup()
 
 	/*
 	 * Interval expressions are now on by default, as POSIX is
-	 * wide-spread enough that people want it. The do_intervals
-	 * variable remains for use with --traditional.
+	 * wide-spread enough that people want it.
+	 *
+	 * 2/2022: BWK awk has supported interval expressions since
+	 * March 2019, with an important fix added in Januay 2020.
+	 * So we add that support even for --traditional. It's easier to
+	 * do it here than to try to get the GLIBC / GNULIB folks to change
+	 * the definition of RE_SYNTAX_AWK, which likely would cause
+	 * binary compatibility issues.
 	 */
-	if (do_intervals)
+	if (do_traditional)
 		syn |= RE_INTERVALS | RE_INVALID_INTERVAL_ORD | RE_NO_BK_BRACES;
 
 	(void) re_set_syntax(syn);