"Name "%s::%s" used only once" warnings are not fatalized #13814

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1. p5pRT commented on May 9, 2014

   

   p5pRT

   on May 9, 2014

   Author

   More actions

   From @karenetheridge

   Created by @karenetheridge

   This code​:

     use strict;
     use warnings FATAL => qw(once);
     print @​Foo​::bar, "\n";
     print "still alive\n";

   Should be fatal. Instead, it prints​:

     Name "Foo​::bar" used only once​: possible typo at foo.pl line 3.

     still alive

   (Behaviour is the same with "use warnings FATAL => 'all'".)

   Perl Info

   
   Flags:
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       severity=low
   
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   st_ino_sign='1'
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   startperl='#!/Users/ether/perl5/perlbrew/perls/19.11/bin/perl5.19.11'
   startsh='#!/bin/sh'
   static_ext=' '
   stdchar='char'
   stdio_base='((fp)->_ub._base ? (fp)->_ub._base : (fp)->_bf._base)'
   stdio_bufsiz='((fp)->_ub._base ? (fp)->_ub._size : (fp)->_bf._size)'
   stdio_cnt='((fp)->_r)'
   stdio_filbuf=''
   stdio_ptr='((fp)->_p)'
   stdio_stream_array=''
   strerror_r_proto='0'
   strings='/usr/include/string.h'
   submit=''
   subversion='11'
   sysman='/usr/share/man/man1'
   sysroot=''
   tail=''
   tar=''
   targetarch=''
   targetdir=''
   targetenv=''
   targethost=''
   targetmkdir=''
   targetport=''
   targetsh='/bin/sh'
   tbl=''
   tee=''
   test='test'
   timeincl='/usr/include/sys/time.h '
   timetype='time_t'
   tmpnam_r_proto='0'
   to=':'
   touch='touch'
   tr='tr'
   trnl='\n'
   troff=''
   ttyname_r_proto='0'
   u16size='2'
   u16type='unsigned short'
   u32size='4'
   u32type='unsigned int'
   u64size='8'
   u64type='unsigned long'
   u8size='1'
   u8type='unsigned char'
   uidformat='"u"'
   uidsign='1'
   uidsize='4'
   uidtype='uid_t'
   uname='uname'
   uniq='uniq'
   uquadtype='unsigned long'
   use5005threads=''
   use64bitall='define'
   use64bitint='define'
   usecrosscompile=''
   usedevel='define'
   usedl='define'
   usedtrace=''
   usefaststdio=''
   useithreads=''
   usekernprocpathname=''
   uselargefiles='define'
   uselongdouble=''
   usemallocwrap='define'
   usemorebits=''
   usemultiplicity=''
   usemymalloc='n'
   usenm='false'
   usensgetexecutablepath='define'
   useopcode='true'
   useperlio='define'
   useposix='true'
   usereentrant=''
   userelocatableinc=''
   useshrplib='false'
   usesitecustomize=''
   usesocks=''
   usethreads=''
   usevendorprefix=''
   useversionedarchname=''
   usevfork='true'
   usrinc='/usr/include'
   uuname=''
   uvXUformat='"lX"'
   uvoformat='"lo"'
   uvsize='8'
   uvtype='unsigned long'
   uvuformat='"lu"'
   uvxformat='"lx"'
   vaproto='define'
   vendorarch=''
   vendorarchexp=''
   vendorbin=''
   vendorbinexp=''
   vendorhtml1dir=' '
   vendorhtml1direxp=''
   vendorhtml3dir=' '
   vendorhtml3direxp=''
   vendorlib=''
   vendorlib_stem=''
   vendorlibexp=''
   vendorman1dir=' '
   vendorman1direxp=''
   vendorman3dir=' '
   vendorman3direxp=''
   vendorprefix=''
   vendorprefixexp=''
   vendorscript=''
   vendorscriptexp=''
   version='5.19.11'
   version_patchlevel_string='version 19 subversion 11'
   versiononly='define'
   vi=''
   xlibpth='/usr/lib/386 /lib/386'
   yacc='yacc'
   yaccflags=''
   zcat=''
   zip='zip'
   -- 
              "If you're gonna be dumb, you gotta be tough. Personally,
                 I'm trying to be less dumb." - sriddy@dropzone.com
               .             .            .            .             .
   Karen Etheridge, karen@etheridge.ca       GCS C+++$ USL+++$ P+++$ w--- M++
   
   

   👍React with 👍1Reacted by Elvin Aslanov
2. p5pRT commented on May 26, 2014

   

   p5pRT

   on May 26, 2014

   Author

   More actions

   From @tonycoz

   On Fri May 09 14​:25​:09 2014, ether@​cpan.org wrote​:

   This code​:

   use strict;
   use warnings FATAL => qw(once);
   print @​Foo​::bar, "\n";
   print "still alive\n";

   Should be fatal. Instead, it prints​:

   Name "Foo​::bar" used only once​: possible typo at foo.pl line 3.

   still alive

   (Behaviour is the same with "use warnings FATAL => 'all'".)

   The cause I think is that the checks for WARN_ONCE aren't done until after compilation is complete and before execution starts, so PL_curcop isn't the cop where the global is being referenced.

   The warning itself is suppressed as the code is compiled by Perl_gv_fetchpvn_flags() which sets GvMULTI_on() on the gv if WARN_ONCE isn't set.

   I don't see a simple way to fix it.

   Tony
3. p5pRT commented on May 26, 2014

   

   p5pRT

   on May 26, 2014

   Author

   More actions

   The RT System itself - Status changed from 'new' to 'open'
4. p5pRT

   added

   Severity Low

   affects-5.19

   distro-darwin

   type-core

   on Oct 19, 2019
5. xenu

   removed

   affects-5.19

   on Nov 19, 2021
6. xenu

   removed

   Severity Low

   on Dec 29, 2021
7. jkeenan commented on Oct 29, 2023

   

   jkeenan

   on Oct 29, 2023

   Contributor

   More actions

   From @tonycoz

   On Fri May 09 14​:25​:09 2014, ether@​cpan.org wrote​:

   This code​:
   use strict;
   use warnings FATAL => qw(once);
   print @​Foo​::bar, "\n";
   print "still alive\n";
   Should be fatal. Instead, it prints​:
   Name "Foo​::bar" used only once​: possible typo at foo.pl line 3.
   still alive
   (Behaviour is the same with "use warnings FATAL => 'all'".)

   The cause I think is that the checks for WARN_ONCE aren't done until after compilation is complete and before execution starts, so PL_curcop isn't the cop where the global is being referenced.

   The warning itself is suppressed as the code is compiled by Perl_gv_fetchpvn_flags() which sets GvMULTI_on() on the gv if WARN_ONCE isn't set.

   I don't see a simple way to fix it.

   Tony

   @tonycoz , @karenetheridge , is this ticket closable?
8. jkeenan

   added

   Closable?We might be able to close this ticket, but we need to check with the reporterWe might be able to close this ticket, but we need to check with the reporter

   and removed

   distro-darwin

   on Oct 29, 2023
9. tonycoz

   self-assigned this

   on Oct 29, 2023
10. tonycoz

    removed

    Closable?We might be able to close this ticket, but we need to check with the reporterWe might be able to close this ticket, but we need to check with the reporter

    on Oct 29, 2023
11. tonycoz commented on Oct 29, 2023

    

    tonycoz

    on Oct 29, 2023

    Contributor

    More actions

    I think it's fixable by adding a GV flag to indicate warnings were fatal when the name was seen.

    I've added this to my assigned list, though if anyone else wants to look at it they're welcome to try.

    👍React with 👍1Reacted by Elvin Aslanov
12. tonycoz

    added 3 commits that reference this issue on Dec 5, 2023

    allow "used only once" warnings to be fatal

    ...

    This issue will close once commit 9873cde is merged into the 'blead' branch.

    9873cde

    allow "used only once" warnings to be fatal

    ...

    This issue will close once commit 5d0e799 is merged into the 'blead' branch.

    5d0e799

    allow "used only once" warnings to be fatal

    ...

    This issue will close once commit 9bb85c7 is merged into the 'blead' branch.

    9bb85c7
13. tonycoz

    closed this as completedin #21693on Dec 7, 2023
14. tonycoz

    added a commit that references this issue on Dec 7, 2023

    allow "used only once" warnings to be fatal

    ...

    This issue will close once commit 01b6007 is merged into the 'blead' branch.

    01b6007