-X does not disable warning enabled by use v5.3{6,8}

[briandfoy]

Description

The -X should turn off all warnings, but does not suppress warnings enabled as part of use v5.36 or use v5.38.

Steps to Reproduce

$ perl5.36.1 -Mwarnings -X -E 'say 1 + "a"'
1

$ perl5.36.1 -Mv5.36 -X -E 'say 1 + "a"'
Argument "a" isn't numeric in addition (+) at -e line 1.
1

$ perl5.38.0 -Mwarnings -X -E 'say 1 + "a"'
1

$ perl5.38.0 -Mv5.38 -X -E 'say 1 + "a"'
Argument "a" isn't numeric in addition (+) at -e line 1.
1

Expected behavior

There are no warnings under -X

Perl configuration

Summary of my perl5 (revision 5 version 38 subversion 0) configuration:
   
  Platform:
    osname=darwin
    osvers=22.6.0
    archname=darwin-2level
    uname='darwin m2otter.local 22.6.0 darwin kernel version 22.6.0: wed jul 5 22:21:53 pdt 2023; root:xnu-8796.141.3~6release_arm64_t6020 arm64 '
    config_args='-des -Dprefix=/usr/local/perls/perl-5.38.0'
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=undef
    usemultiplicity=undef
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
  Compiler:
    cc='cc'
    ccflags ='-fno-common -DPERL_DARWIN -mmacosx-version-min=13.5 -DNO_POSIX_2008_LOCALE -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    optimize='-O3'
    cppflags='-fno-common -DPERL_DARWIN -mmacosx-version-min=13.5 -DNO_POSIX_2008_LOCALE -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='Apple LLVM 14.0.3 (clang-1403.0.22.14.1)'
    gccosandvers=''
    intsize=4
    longsize=8
    ptrsize=8
    doublesize=8
    byteorder=12345678
    doublekind=3
    d_longlong=define
    longlongsize=8
    d_longdbl=define
    longdblsize=8
    longdblkind=0
    ivtype='long'
    ivsize=8
    nvtype='double'
    nvsize=8
    Off_t='off_t'
    lseeksize=8
    alignbytes=8
    prototype=define
  Linker and Libraries:
    ld='cc'
    ldflags =' -mmacosx-version-min=13.5 -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /Library/Developer/CommandLineTools/usr/lib/clang/14.0.3/lib /Library/Developer/CommandLineTools/SDKs/MacOSX13.3.sdk/usr/lib /Library/Developer/CommandLineTools/usr/lib /usr/lib
    libs= 
    perllibs=
    libc=
    so=dylib
    useshrplib=false
    libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=bundle
    d_dlsymun=undef
    ccdlflags=' '
    cccdlflags=' '
    lddlflags=' -mmacosx-version-min=13.5 -bundle -undefined dynamic_lookup -L/usr/local/lib -fstack-protector-strong'


Characteristics of this binary (from libperl): 
  Compile-time options:
    HAS_LONG_DOUBLE
    HAS_STRTOLD
    HAS_TIMES
    PERLIO_LAYERS
    PERL_COPY_ON_WRITE
    PERL_DONT_CREATE_GVSV
    PERL_HASH_FUNC_SIPHASH13
    PERL_HASH_USE_SBOX32
    PERL_MALLOC_WRAP
    PERL_OP_PARENT
    PERL_PRESERVE_IVUV
    PERL_USE_SAFE_PUTENV
    USE_64_BIT_ALL
    USE_64_BIT_INT
    USE_LARGE_FILES
    USE_LOCALE
    USE_LOCALE_COLLATE
    USE_LOCALE_CTYPE
    USE_LOCALE_NUMERIC
    USE_LOCALE_TIME
    USE_PERLIO
    USE_PERL_ATOF
  Built under darwin
  Compiled at Aug  5 2023 01:46:29
  %ENV:
    PERL="/Users/brian/bin/perls/perl-latest"
    PERL5_PATH="/Users/brian/bin/perls"
  @INC:
    /usr/local/perls/perl-5.38.0/lib/site_perl/5.38.0/darwin-2level
    /usr/local/perls/perl-5.38.0/lib/site_perl/5.38.0
    /usr/local/perls/perl-5.38.0/lib/5.38.0/darwin-2level
    /usr/local/perls/perl-5.38.0/lib/5.38.0

[jkeenan]

Description

The -X should turn off all warnings, but does not suppress warnings enabled as part of use v5.36 or use v5.38.

This must reflect a change between 5.34 and 5.36.

$ perl -v | head -2 | tail -1
This is perl 5, version 34, subversion 0 (v5.34.0) built for x86_64-linux
$ perl -Mwarnings -X -E 'say 1 + "a"'
1
$ perl -Mv5.34 -X -E 'say 1 + "a"'
1

For context, here's what perldoc perlrun says in 5.38.0:

    -X   Disables all warnings regardless of "use warnings" or $^W. See
         warnings.

         Forbidden in "PERL5OPT".

I'm confirming @briandfoy's bug report, but not (yet) taking any position on what is to be done.

[Leont]

This must reflect a change between 5.34 and 5.36.

Yes, «use 5.036» is the first to enable warnings.