comment on

I'm a long time user of Cygwin for both personal and $work tasks. I currently have (running on Win10):

ken@titan ~/tmp
$ uname -a
CYGWIN_NT-10.0-19045 titan 3.6.1-1.x86_64 2025-04-09 11:31 UTC x86_64 
+Cygwin
[download]

I update Cygwin weekly which typically takes just a few minutes; updating infrequently can take hours -- obviously, I'd recommend the former. The last update that I did was less than 12 hours ago and there were multiple pages of perl-* packages (this still only took some minutes).

I never use the system perl (/usr/bin/perl) except for tests such as those that follow; I do use Perlbrew which I heartily recommend.

I don't know why you quoted -Mdiagnostics. It seems superfluous but maybe you had a reason. I've used quoted and unquoted versions in the examples below.

I can't reproduce your error. I rarely use the diagnostics pragma but don't recall ever having encountered problems with this.

Here's my normal and system perls:

ken@titan ~/tmp
$ perl -v | head -2 | tail -1
This is perl 5, version 40, subversion 0 (v5.40.0) built for cygwin-th
+read-multi

$ which perl
/home/ken/perl5/perlbrew/perls/perl-5.40.0/bin/perl

$ /usr/bin/perl -v | head -2 | tail -1
This is perl 5, version 40, subversion 2 (v5.40.2) built for x86_64-cy
+gwin-threads-multi
[download]

Here's @INC for both:

ken@titan ~/tmp
$ perl -E 'say for @INC'
/home/ken/perl5/perlbrew/perls/perl-5.40.0/lib/site_perl/5.40.0/cygwin
+-thread-multi
/home/ken/perl5/perlbrew/perls/perl-5.40.0/lib/site_perl/5.40.0
/home/ken/perl5/perlbrew/perls/perl-5.40.0/lib/5.40.0/cygwin-thread-mu
+lti
/home/ken/perl5/perlbrew/perls/perl-5.40.0/lib/5.40.0

$ /usr/bin/perl -E 'say for @INC'
/usr/local/lib/perl5/site_perl/5.40/x86_64-cygwin-threads
/usr/local/share/perl5/site_perl/5.40
/usr/lib/perl5/vendor_perl/5.40/x86_64-cygwin-threads
/usr/share/perl5/vendor_perl/5.40
/usr/lib/perl5/5.40/x86_64-cygwin-threads
/usr/share/perl5/5.40
[download]

Here's examples of your "Simplest test case":

ken@titan ~/tmp
$ perl '-Mdiagnostics' -le 'print $diagnostics::VERSION'
1.40

$ perl -Mdiagnostics -le 'print $diagnostics::VERSION'
1.40

$ /usr/bin/perl '-Mdiagnostics' -le 'print $diagnostics::VERSION'
1.40

$ /usr/bin/perl -Mdiagnostics -le 'print $diagnostics::VERSION'
1.40
[download]

If you're installing modules on the system perl, you may have inadvertently broken something in the past.

I don't know enough about your system to offer advice beyond update Cygwin and use Perlbrew. Sorry if that's not particularly helpful for this specific problem. Good luck with your troubleshooting.

— Ken

In reply to Re: diagnostics pragma throwing a compile-time error in Cygwin-Perl by kcott
in thread diagnostics pragma throwing a compile-time error in Cygwin-Perl by Intrepid

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