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Id: 131518
Status: pending release
Priority: 0/
Queue: perl5

Owner: Nobody
Requestors: ronaldxs <ronaldxs [at] software-path.com>
Cc:
AdminCc:

Operating System: (no value)
PatchStatus: (no value)
Severity: low
Type: docs
Perl Version: 5.26.0
Fixed In: 5.27.8

Attachments
0001-perlrun-warn-on-mpragma-eg-strict-blindsiding.patch



Subject: [PATCH] -mpragma (eg strict) fail silent blindsiding
To: perlbug [...] perl.org
Date: Tue, 06 Jun 2017 16:28:27 +0200
From: Ronald Schmidt <ronaldxs [...] software-path.com>
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This is a bug report for perl from ronaldxs@software-path.com, generated with the help of perlbug 1.40 running under perl 5.26.0. ----------------------------------------------------------------- [Please describe your issue here] document -mpragma (eg strict) fail silent "perl -Mstrict" is used all the time and I noticed that "perl -mstrict" (lower case -m) runs without "strict" being in effect. It seems to me to be a potentially dangerous surprise and while the docs note that "-m" uses an empty import list it also seems to currently take a little too much expertise and digging to understand the effect of the empty import list on pragma(ta|s). A programmer using Perl should not need to know how to write a custom pragma to understand that -mstrict does not work because of the empty import list. This patch to perlrun.pod is a proposed remedy. [Please do not change anything below this line] ----------------------------------------------------------------- --- Flags: category=docs severity=low Type=Patch PatchStatus=HasPatch --- Site configuration information for perl 5.26.0: Configured by ron at Mon Jun 5 13:50:57 EDT 2017. Summary of my perl5 (revision 5 version 26 subversion 0) configuration: Local Commit: b85ff045c4480eca8989420062c698a819c47105 Ancestor: 5ad96e9e32a29f927d3e9dec23fd1d7d3e89665f Platform: osname=linux osvers=4.4.0-31-generic archname=x86_64-linux uname='linux ws-ubuntu 4.4.0-31-generic #50~14.04.1-ubuntu smp wed jul 13 01:07:32 utc 2016 x86_64 x86_64 x86_64 gnulinux ' config_args='' hint=recommended useposix=true d_sigaction=define useithreads=undef usemultiplicity=undef use64bitint=define use64bitall=define uselongdouble=undef usemymalloc=n default_inc_excludes_dot=define bincompat5005=undef Compiler: cc='cc' ccflags ='-fwrapv -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64' optimize='-O2' cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include' ccversion='' gccversion='4.8.4' gccosandvers='' intsize=4 longsize=8 ptrsize=8 doublesize=8 byteorder=12345678 doublekind=3 d_longlong=define longlongsize=8 d_longdbl=define longdblsize=16 longdblkind=3 ivtype='long' ivsize=8 nvtype='double' nvsize=8 Off_t='off_t' lseeksize=8 alignbytes=8 prototype=define Linker and Libraries: ld='cc' ldflags =' -fstack-protector -L/usr/local/lib' libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/4.8/include-fixed /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib libs=-lpthread -lnsl -lgdbm -ldl -lm -lcrypt -lutil -lc -lgdbm_compat perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc libc=libc-2.19.so so=so useshrplib=false libperl=libperl.a gnulibc_version='2.19' Dynamic Linking: dlsrc=dl_dlopen.xs dlext=so d_dlsymun=undef ccdlflags='-Wl,-E' cccdlflags='-fPIC' lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector' Locally applied patches: b85ff045c4480eca8989420062c698a819c47105 --- @INC for perl 5.26.0: lib /usr/local/lib/perl5/site_perl/5.26.0/x86_64-linux /usr/local/lib/perl5/site_perl/5.26.0 /usr/local/lib/perl5/5.26.0/x86_64-linux /usr/local/lib/perl5/5.26.0 --- Environment for perl 5.26.0: HOME=/home/ron LANG=en_US.UTF-8 LANGUAGE (unset) LD_LIBRARY_PATH (unset) LOGDIR (unset) PATH=/home/ron/perl5/perlbrew/bin:/home/ron/.rvm/gems/ruby-2.4.0-rc1/bin:/home/ron/.rvm/gems/ruby-2.4.0-rc1@global/bin:/home/ron/.rvm/rubies/ruby-2.4.0-rc1/bin:/home/ron/.rakudobrew/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/ron/.rakudobrew/moar-nom/install/share/perl6/site/bin:/home/ron/bin:/home/ron/.rvm/bin PERLBREW_BASHRC_VERSION=0.78 PERLBREW_HOME=/home/ron/.perlbrew PERLBREW_PATH=/home/ron/perl5/perlbrew/bin PERLBREW_ROOT=/home/ron/perl5/perlbrew PERLBREW_VERSION=0.78 PERL_BADLANG (unset) SHELL=/bin/bash

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RT-Send-CC: perl5-porters [...] perl.org
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On Tue, 06 Jun 2017 14:44:56 GMT, ronaldxs wrote: Show quoted text
> This is a bug report for perl from ronaldxs@software-path.com, > generated with the help of perlbug 1.40 running under perl 5.26.0. > > > ----------------------------------------------------------------- > [Please describe your issue here] > document -mpragma (eg strict) fail silent > > "perl -Mstrict" is used all the time and I noticed that "perl > -mstrict" > (lower case -m) runs without "strict" being in effect. It seems to > me to be a potentially dangerous surprise and while the docs note that > "-m" uses an empty import list it also seems to currently take a > little > too much expertise and digging to understand the effect of the empty > import list on pragma(ta|s). > > A programmer using Perl should not need to know how to write a custom > pragma to understand that -mstrict does not work because of the empty > import list. This patch to perlrun.pod is a proposed remedy. >
I think your argument is correct and the patch should be applied. However, I think something is amiss in the syntax of this part: ##### ... prevents the call to import usually used by a pragma set active and other status for the current scope ##### Something about "set active and other status" doesn't sound right. Can you clarify? Thank you very much. -- James E Keenan (jkeenan@cpan.org)
Date: Sat, 30 Dec 2017 11:52:50 +0000
To: perl5-porters [...] perl.org
Subject: Re: [perl #131518] [PATCH] -mpragma (eg strict) fail silent blindsiding
From: Zefram <zefram [...] fysh.org>
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Fixed with a different documentation edit in commit e2bcc7d7ec67c661405135f9b00232631a97f2fb. -zefram


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