On Wed, 2021-05-26 at 20:05 +0100, Sérgio Basto wrote: > Hi, > debhelper-devel ML doesn't exist anymore, please let me know if I > should report this in other place . > > I can't build debhelper on Centos epel 8, which have Perl 5.26.3 >
I forgot to mention from changelog of debhelper-13.1 "Dh_Lib.pm: Require perl v5.24 (available in Debian oldstable) to enable more modern features. " But seems this is not correct, it needs Perl 5.28.0 > fedpkg clone debhelper > cd debhelper > fedpkg srpm && mock -r epel-8-x86_64 --no-clean --rebuild debhelper- > 13.3.4-1.fc35.src.rpm > > and in epel8 build ends with > "Initialization of state variables in list context currently forbidden > at /builddir/build/BUILD/debhelper- > 13.3.4/lib/Debian/Debhelper/Dh_Lib.pm line 2021, near");" " > > Petr wrote : > perl has a "splain" tool which explains the compiler errors and > warnings: > > $ splain > /usr/bin/splain: Reading from STDIN > Initialization of state variables in list context currently forbidden > at /home/test/fedora/debhelper/debhelper- > 13.3.4/lib/Debian/Debhelper/Dh_Lib.pm line 2021, near ");" > Initialization of state variables in list context currently forbidden > at > /home/test/fedora/debhelper/debhelper- > 13.3.4/lib/Debian/Debhelper/Dh_Lib.pm line 2021, near ");" (#1) > (F) state only permits initializing a single scalar variable, in > scalar > context. So state $a = 42 is allowed, but not state ($a) = 42. To > apply > state semantics to a hash or array, store a hash or array reference > in a > scalar variable. > > What do we have at the line 2021?: > > state %rrr = map { $_ => 1 } split(' ', $rrr_env); > > That's it. perl 5.26.3 does not support "state" declaration for hashes > (%err). > Here is a one-line reproducer: > > $ perl -e 'use v5.24; sub foo {state %rrr = map { $_ => 1 } split(q{ }, > q{});}' > Initialization of state variables in list context currently forbidden > at -e line 1, near ");" > Execution of -e aborted due to compilation errors. > > Which can be reduced to: > > $ perl -e 'use v5.24; state %rrr = ();' > Initialization of state variables in list context currently forbidden > at -e line 1, near ");" > Execution of -e aborted due to compilation errors. > > Please note that the "use v5.24;" statement is taken from debhelper > code. > It's obviously an upstream bug. The code is not valid syntax for perl > 5.24. > > The state support for non-scalar types was implemented in Perl 5.28.0 > (see > "perldoc perl5280delta" command output): > > Initialisation of aggregate state variables > A persistent lexical array or hash variable can now be initialized, > by > an expression such as "state @a = qw(x y z)". Initialization of a > list > of persistent lexical variables is still not possible. > > You should reach out debhelper upstream to correct the "use v5.24;" > into "use > v5.28;". Or you can ask them to refactor the code to support perl 5.26. > > > > Thanks , -- Sérgio M. B.