Enabled stack-use-after-return (Linux/Darwin) and leak-detection (Linux).  
Smoke logs available at 
http://m-l.org/~perl/smoke/perl/x86_64-linux-thread-multi/blead_clang++_sanitize=address/logfe49b83f91941b25e49385588692490299cf9357.log.gz

Automated smoke report for branch blead 5.31.12 patch 
fe49b83f91941b25e49385588692490299cf9357 v5.31.11-53-gfe49b83f91
vier.local: Intel(R) Core(TM) i7-3820 CPU @ 3.60GHz (GenuineIntel 3702MHz) 
(x86_64/1 cpu[8 cores])
    on        linux - 5.3.12-200.fc30.x86_64 [Fedora 32]
    using     ccache clang++ version Clang 10.0.0 (Fedora 10.0.0-1.fc32)
    smoketime 4 days 12 hours (average 6 hours 45 minutes)

Summary: FAIL(F)

O = OK  F = Failure(s), extended report at the bottom
X = Failure(s) under TEST but not under harness
? = still running or test results not (yet) available
Build failures during:       - = unknown or N/A
c = Configure, m = make, M = make (after miniperl), t = make test-prep

v5.31.11-53-gfe49b83f91  Configuration (common) 
-Accflags="-Werror=declaration-after-statement -g -fno-omit-frame-pointer 
-fsanitize=address  -fno-common -fsanitize-blacklist=`pwd`/asan_ignore" 
-Aldflags="-fsanitize=address" -Dcc="ccache clang++"
----------- ---------------------------------------------------------
F F F F F F -Accflags=-DNO_MATHOMS
F F F F F F -Accflags=-DPERL_POISON
F F F F F F -Duse64bitall
F F F F F F -Dusemorebits
F F F F F F -Duseithreads -Accflags=-DNO_MATHOMS
F F F F F F -Duseithreads -Accflags=-DPERL_POISON
F F F F F F -Duseithreads -Duse64bitall
F F F F F F -Duseithreads -Dusemorebits
| | | | | +- LC_ALL = en_US.utf8 -DDEBUGGING
| | | | +--- PERLIO = perlio -DDEBUGGING
| | | +----- PERLIO = stdio  -DDEBUGGING
| | +------- LC_ALL = en_US.utf8
| +--------- PERLIO = perlio
+----------- PERLIO = stdio 

Locally applied patches:
    SMOKEfe49b83f91941b25e49385588692490299cf9357

Failures: (common-args) -Accflags="-Werror=declaration-after-statement -g 
-fno-omit-frame-pointer -fsanitize=address  -fno-common 
-fsanitize-blacklist=`pwd`/asan_ignore" -Aldflags="-fsanitize=address" 
-Dcc="ccache clang++"
[stdio/perlio/en_US.utf8] -Accflags=-DNO_MATHOMS
[stdio/perlio/en_US.utf8] -DDEBUGGING -Accflags=-DNO_MATHOMS
[stdio/perlio/en_US.utf8] -Accflags=-DPERL_POISON
[stdio/perlio/en_US.utf8] -DDEBUGGING -Accflags=-DPERL_POISON
[stdio/perlio/en_US.utf8] -Duse64bitall
[stdio/perlio/en_US.utf8] -DDEBUGGING -Duse64bitall
[stdio/perlio/en_US.utf8] -Dusemorebits
[stdio/perlio/en_US.utf8] -DDEBUGGING -Dusemorebits
    ../t/re/pat.t...............................................FAILED
        Non-zero exit status: 1

[stdio/perlio/en_US.utf8] -Duseithreads -Accflags=-DNO_MATHOMS
[stdio/perlio/en_US.utf8] -DDEBUGGING -Duseithreads -Accflags=-DNO_MATHOMS
[stdio/perlio/en_US.utf8] -Duseithreads -Accflags=-DPERL_POISON
[perlio/en_US.utf8] -DDEBUGGING -Duseithreads -Accflags=-DPERL_POISON
[stdio/perlio/en_US.utf8] -Duseithreads -Duse64bitall
[stdio/perlio/en_US.utf8] -DDEBUGGING -Duseithreads -Duse64bitall
[stdio/perlio/en_US.utf8] -Duseithreads -Dusemorebits
[stdio/perlio/en_US.utf8] -DDEBUGGING -Duseithreads -Dusemorebits
    ../t/re/pat.t...............................................FAILED
        Non-zero exit status: 1
    ../t/re/pat_thr.t...........................................FAILED
        Non-zero exit status: 1

[stdio] -DDEBUGGING -Duseithreads -Accflags=-DPERL_POISON
    ../t/re/pat.t...............................................FAILED
        Non-zero exit status: 1
    ../t/re/pat_thr.t...........................................FAILED
        Non-zero exit status: 1
Inconsistent test results (between TEST and harness):
    ../cpan/File-Path/t/Path.t.............. 
......................................... FAILED--non-zero wait status: 256

MANIFEST did not declare '.mailmap'

Compiler messages(gcc):
awk: cmd. line:1: warning: regexp escape sequence `\=' is not a known regexp 
operator
./inline.h:1965:48: warning: implicit conversion from 'IV' (aka 'long') to 
'double' changes value from 9223372036854775807 to 9223372036854775808 
[-Wimplicit-int-float-conversion]
./perl.h:1916:20: note: expanded from macro 'IV_MAX'
./perl.h:2606:29: note: expanded from macro 'PERL_QUAD_MAX'
./perl.h:3668:58: note: expanded from macro 'UNLIKELY'
./handy.h:111:24: note: expanded from macro 'cBOOL'
./perl.h:3647:62: note: expanded from macro 'EXPECT'
sv.c:2078:22: warning: implicit conversion from 'UV' (aka 'unsigned long') to 
'double' changes value from 9223372036854775807 to 9223372036854775808 
[-Wimplicit-int-float-conversion]
sv.c:11182:27: warning: implicit conversion from 'UV' (aka 'unsigned long') to 
'double' changes value from 18446744073709551615 to 18446744073709551616 
[-Wimplicit-int-float-conversion]
./perl.h:1918:20: note: expanded from macro 'UV_MAX'
./perl.h:2604:29: note: expanded from macro 'PERL_UQUAD_MAX'
sv.c:12559:41: warning: adding 'int' to a string does not append to the string 
[-Wstring-plus-int]
./handy.h:545:37: note: expanded from macro 'strnEQ'
sv.c:12559:41: note: use array indexing to silence this warning
regcomp.c:10639:13: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
./regcharclass.h:469:8: note: expanded from macro 
'is_MULTI_CHAR_FOLD_latin1_safe'
regcomp.c:10727:13: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
./regcharclass.h:388:8: note: expanded from macro 'is_MULTI_CHAR_FOLD_utf8_safe'
./regcharclass.h:412:9: note: expanded from macro 'is_MULTI_CHAR_FOLD_utf8_safe'
./regcharclass.h:435:6: note: expanded from macro 'is_MULTI_CHAR_FOLD_utf8_safe'
./regcharclass.h:436:9: note: expanded from macro 'is_MULTI_CHAR_FOLD_utf8_safe'
./regcharclass.h:442:9: note: expanded from macro 'is_MULTI_CHAR_FOLD_utf8_safe'
./regcharclass.h:457:19: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe'
./regcharclass.h:251:8: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe_part0'
./regcharclass.h:457:61: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe'
./regcharclass.h:309:8: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe_part1'
./regcharclass.h:359:8: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe_part1'
regcomp.c:15020:37: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
./regcharclass.h:522:4: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
./regcharclass.h:528:8: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
./regcharclass.h:530:8: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
./regcharclass.h:535:8: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
./regcharclass.h:537:8: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
./regcharclass.h:549:4: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
./regcharclass.h:566:4: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
regcomp.c:15071:38: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
regcomp.c:15119:37: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
./regcharclass.h:588:4: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_latin1_safe'
regcomp.c:15140:38: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
pp_ctl.c:1231:27: warning: implicit conversion from 'IV' (aka 'long') to 
'double' changes value from 9223372036854775807 to 9223372036854775808 
[-Wimplicit-int-float-conversion]
locale.c:1748:27: warning: array subscript is of type 'char' [-Wchar-subscripts]
locale.c:1749:27: warning: array subscript is of type 'char' [-Wchar-subscripts]
regexec.c:2787:25: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
./regcharclass.h:58:4: note: expanded from macro 'is_LNBREAK_utf8_safe'
./regcharclass.h:65:4: note: expanded from macro 'is_LNBREAK_utf8_safe'
regexec.c:2788:25: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
./regcharclass.h:76:4: note: expanded from macro 'is_LNBREAK_latin1_safe'
regexec.c:4362:34: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
regexec.c:4363:34: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
DynaLoader.c:547:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
../../XSUB.h:134:29: note: expanded from macro 'XS_EXTERNAL'
attributes.c:465:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
B.c:3518:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
compress.c:190:13: warning: 'register' storage class specifier is deprecated 
and incompatible with C++17 [-Wdeprecated-register]
compress.c:191:13: warning: 'register' storage class specifier is deprecated 
and incompatible with C++17 [-Wdeprecated-register]
compress.c:192:13: warning: 'register' storage class specifier is deprecated 
and incompatible with C++17 [-Wdeprecated-register]
compress.c:198:16: warning: 'register' storage class specifier is deprecated 
and incompatible with C++17 [-Wdeprecated-register]
compress.c:361:13: warning: 'register' storage class specifier is deprecated 
and incompatible with C++17 [-Wdeprecated-register]
compress.c:362:13: warning: 'register' storage class specifier is deprecated 
and incompatible with C++17 [-Wdeprecated-register]
deflate.c:1243:5: warning: 'register' storage class specifier is deprecated and 
incompatible with C++17 [-Wdeprecated-register]
deflate.c:1244:5: warning: 'register' storage class specifier is deprecated and 
incompatible with C++17 [-Wdeprecated-register]
deflate.c:1245:5: warning: 'register' storage class specifier is deprecated and 
incompatible with C++17 [-Wdeprecated-register]
deflate.c:1264:5: warning: 'register' storage class specifier is deprecated and 
incompatible with C++17 [-Wdeprecated-register]
deflate.c:1265:5: warning: 'register' storage class specifier is deprecated and 
incompatible with C++17 [-Wdeprecated-register]
deflate.c:1266:5: warning: 'register' storage class specifier is deprecated and 
incompatible with C++17 [-Wdeprecated-register]
deflate.c:54:12: warning: unused variable 'deflate_copyright' 
[-Wunused-const-variable]
Cwd.c:1079:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Bzip2.c:1669:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
inftrees.c:11:12: warning: unused variable 'inflate_copyright' 
[-Wunused-const-variable]
trees.c:1164:5: warning: 'register' storage class specifier is deprecated and 
incompatible with C++17 [-Wdeprecated-register]
Dumper.c:1930:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
DB_File.c:3067:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Peek.c:840:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
MD5.c:1054:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
SHA.c:723:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Fcntl.c:316:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
RealPPPort.c:8185:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Byte.c:187:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
../../../XSUB.h:134:29: note: expanded from macro 'XS_EXTERNAL'
DosGlob.c:208:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Encode.c:1581:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Glob.c:706:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
CN.c:192:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
EBCDIC.c:187:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Call.c:464:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Util.c:720:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
FieldHash.c:718:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Langinfo.c:313:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
IO.c:1000:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
SysV.c:829:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
ListUtil.c:2220:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Base64.xs:189:2: warning: 'register' storage class specifier is deprecated and 
incompatible with C++17 [-Wdeprecated-register]
Base64.xs:285:2: warning: 'register' storage class specifier is deprecated and 
incompatible with C++17 [-Wdeprecated-register]
Base64.c:728:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
JP.c:193:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
mro.c:928:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Opcode.c:867:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
mmap.c:449:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
encoding.c:792:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
scalar.c:601:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
via.c:843:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
POSIX.xs:1320:16: warning: implicit conversion from 'UV' (aka 'unsigned long') 
to 'double' changes value from 18446744073709551615 to 18446744073709551616 
[-Wimplicit-int-float-conversion]
../../perl.h:1918:20: note: expanded from macro 'UV_MAX'
../../perl.h:2604:29: note: expanded from macro 'PERL_UQUAD_MAX'
re_exec.c:2787:25: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
../../regcharclass.h:58:4: note: expanded from macro 'is_LNBREAK_utf8_safe'
../../regcharclass.h:65:4: note: expanded from macro 'is_LNBREAK_utf8_safe'
re_exec.c:2788:25: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
../../regcharclass.h:76:4: note: expanded from macro 'is_LNBREAK_latin1_safe'
POSIX.c:5685:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
re_exec.c:4362:34: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
../../regcharclass.h:388:8: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe'
../../regcharclass.h:412:9: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe'
../../regcharclass.h:435:6: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe'
../../regcharclass.h:436:9: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe'
../../regcharclass.h:442:9: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe'
../../regcharclass.h:457:19: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe'
../../regcharclass.h:251:8: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe_part0'
../../regcharclass.h:457:61: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe'
../../regcharclass.h:309:8: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe_part1'
../../regcharclass.h:359:8: note: expanded from macro 
'is_MULTI_CHAR_FOLD_utf8_safe_part1'
re_exec.c:4363:34: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
../../regcharclass.h:469:8: note: expanded from macro 
'is_MULTI_CHAR_FOLD_latin1_safe'
KR.c:191:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
SDBM_File.c:583:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Symbol.c:187:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Socket.c:1848:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
./const-xs.inc:131:42: warning: AI_IDN_ALLOW_UNASSIGNED is deprecated 
[-W#pragma-messages]
/usr/include/netdb.h:609:3: note: expanded from macro 'AI_IDN_ALLOW_UNASSIGNED'
/usr/include/sys/cdefs.h:495:3: note: expanded from macro 
'__glibc_macro_warning'
/usr/include/sys/cdefs.h:493:42: note: expanded from macro 
'__glibc_macro_warning1'
<scratch space>:166:6: note: expanded from here
./const-xs.inc:134:46: warning: AI_IDN_USE_STD3_ASCII_RULES is deprecated 
[-W#pragma-messages]
/usr/include/netdb.h:611:3: note: expanded from macro 
'AI_IDN_USE_STD3_ASCII_RULES'
<scratch space>:169:6: note: expanded from here
./const-xs.inc:386:42: warning: NI_IDN_ALLOW_UNASSIGNED is deprecated 
[-W#pragma-messages]
/usr/include/netdb.h:650:3: note: expanded from macro 'NI_IDN_ALLOW_UNASSIGNED'
<scratch space>:172:6: note: expanded from here
./const-xs.inc:389:46: warning: NI_IDN_USE_STD3_ASCII_RULES is deprecated 
[-W#pragma-messages]
/usr/include/netdb.h:652:3: note: expanded from macro 
'NI_IDN_USE_STD3_ASCII_RULES'
<scratch space>:175:6: note: expanded from here
Storable.c:8166:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
re_comp.c:8216:37: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
../../scope.h:210:4: note: expanded from macro 'LEAVE_with_name'
/usr/include/assert.h:90:27: note: expanded from macro 'assert'
re_comp.c:6637:13: note: expanded from macro 'CHECK_RESTUDY_GOTO_butfirst'
re_comp.c:8264:2: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
re_comp.c:10639:13: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
re_comp.c:10727:13: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
re_comp.c:15020:37: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
../../regcharclass.h:522:4: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
../../regcharclass.h:528:8: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
../../regcharclass.h:530:8: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
../../regcharclass.h:535:8: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
../../regcharclass.h:537:8: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
../../regcharclass.h:549:4: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
../../regcharclass.h:566:4: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_utf8_safe'
re_comp.c:15071:38: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
re_comp.c:15119:37: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
../../regcharclass.h:588:4: note: expanded from macro 
'is_THREE_CHAR_FOLD_HEAD_latin1_safe'
re_comp.c:15140:38: warning: converting the result of '?:' with integer 
constants to a boolean always evaluates to 'true' 
[-Wtautological-constant-compare]
Hostname.c:243:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
TW.c:190:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Unicode.c:704:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Syslog.c:532:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
threads.c:2193:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
shared.c:2147:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Piece.c:1424:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
HiRes.c:2370:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Collate.c:1048:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
re.c:328:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Typemap.c:1919:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
APItest.c:3281:2: warning: 'Perl_ptr_table_clear' is deprecated 
[-Wdeprecated-declarations]
../../embed.h:444:28: note: expanded from macro 'ptr_table_clear'
../../proto.h:2736:4: note: 'Perl_ptr_table_clear' has been explicitly marked 
deprecated here
../../perl.h:356:60: note: expanded from macro '__attribute__deprecated__'
XSUB-undef-XS_VERSION.c:194:1: warning: duplicate 'extern' declaration 
specifier [-Wduplicate-decl-specifier]
XSUB-redefined-macros.c:216:1: warning: duplicate 'extern' declaration 
specifier [-Wduplicate-decl-specifier]
APItest.c:13869:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
FastCalc.c:628:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
Normalize.c:1289:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
XSTest.c:340:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
/home/perl/smoke/perl/blead_clang++_sanitize=address/build/XSUB.h:134:29: note: 
expanded from macro 'XS_EXTERNAL'
XSMore.c:525:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
XSUsage.c:301:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
ExtTest.c:660:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
../../../../XSUB.h:134:29: note: expanded from macro 'XS_EXTERNAL'
ExtTest.c:356:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
ExtTest.c:442:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
ExtTest.c:376:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
ExtTest.c:460:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
ExtTest.c:441:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
ExtTest.c:417:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
toke.c:4280:5: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
./scope.h:210:4: note: expanded from macro 'LEAVE_with_name'
toke.c:6223:20: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
toke.c:12035:3: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_hot.c:192:3: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_hot.c:4557:5: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_hot.c:4564:2: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp.c:5725:2: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp.c:5781:2: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp.c:6372:6: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
regcomp.c:8216:37: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
regcomp.c:6637:13: note: expanded from macro 'CHECK_RESTUDY_GOTO_butfirst'
regcomp.c:8264:2: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_sys.c:312:6: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_sys.c:397:5: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_sys.c:586:5: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_sys.c:989:5: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_sys.c:1024:9: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_ctl.c:1107:5: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_ctl.c:1113:2: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_ctl.c:3578:5: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_ctl.c:4099:7: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_ctl.c:4767:5: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_ctl.c:4866:3: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_ctl.c:4898:3: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_ctl.c:4920:6: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
pp_ctl.c:5766:2: warning: result of comparison against a string literal is 
unspecified (use an explicit string comparison function instead) 
[-Wstring-compare]
Zlib.c:3713:1: warning: duplicate 'extern' declaration specifier 
[-Wduplicate-decl-specifier]
<scratch space>:46:6: note: expanded from here
<scratch space>:49:6: note: expanded from here
<scratch space>:52:6: note: expanded from here
<scratch space>:55:6: note: expanded from here
<scratch space>:151:6: note: expanded from here
<scratch space>:154:6: note: expanded from here
<scratch space>:157:6: note: expanded from here
<scratch space>:160:6: note: expanded from here
<scratch space>:32:6: note: expanded from here
<scratch space>:35:6: note: expanded from here
<scratch space>:38:6: note: expanded from here
<scratch space>:41:6: note: expanded from here

Non-Fatal messages(gcc):

-- 
Report by Test::Smoke v1.72 running on perl 5.30.2
(Reporter v0.053 / Smoker v0.046)

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