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.