My take, with one of the sub-modules being Exporter-based, the second using its own import(), and the One Module still being able to figure out how to bind them together and tell the world what to do:

11146642-tldr.pl

#!perl

use 5.012; # //, strict, say
use warnings;
use FindBin;
use lib "$FindBin::Bin/lib";
use Mod11146642::All;

# Mod11146642::One uses Exporter
# Mod11146642::Two uses manual import()
# but both work through Mod11146642::All

oneFunction();
twoFunction();
[download]

Mod11146642/All.pm

package Mod11146642::All 1.00;

use 5.012; # //, strict, say
use warnings;

use Exporter 5.47 qw(import);

my %colons;
my @inherited;

BEGIN {
    $colons{$_} = $_ for keys %::Mod11146642::All::;
}

use Mod11146642::One;
use Mod11146642::Two;

BEGIN {
    for (sort keys %::Mod11146642::All::) {
        next if /^__ANON__$/;           # ignore anonymous functions
        next if exists $colons{$_};     # ones that were in the namesp
+ace before weren't inherited
        push @inherited, $_;            # if we're here, we inherited 
+this
    }
    # local $" = ",";  warn "inherited (@inherited)\n";   # un-comment
+ this line if you want to debug the ineritance check
}

our @EXPORT = @inherited;

1;
[download]

Mod11146642/One.pm

package Mod11146642::One 1.00;

use 5.012; # //, strict, say
use warnings;
use Exporter 5.47 qw(import);

our @EXPORT = qw(oneFunction);

sub oneFunction
{
    local $" = ",";
    printf STDERR "Called %s(@_)\n", (caller(0))[3];
}

1;
[download]

Mod11146642/Two.pm

package Mod11146642::Two 2.00;

use 5.012; # //, strict, say
use warnings;

sub twoFunction
{
    local $" = ",";
    printf STDERR "Called %s(@_)\n", (caller(0))[3];
}

sub import
{
    my ($pkg) = @_;
    my $callpkg = caller(0);
    no strict 'refs';
    my $exportfunction = $callpkg . '::twoFunction';
    *{$exportfunction} = \&twoFunction;
}

1;
[download]

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