my @bootloader_configs;
push @bootloader_configs, generate_grub_config($grub_config, $config_name, $prefix, $modules, $grub_preamble) if (defined $grub_config);
push @bootloader_configs, generate_grub2_config($grub2_config, $config_name, $prefix, $modules, $grub_preamble, $grub2_prolog) if (defined $grub2_config);
my @bootloader_configs;
push @bootloader_configs, generate_grub_config($grub_config, $config_name, $prefix, $modules, $grub_preamble) if (defined $grub_config);
push @bootloader_configs, generate_grub2_config($grub2_config, $config_name, $prefix, $modules, $grub_preamble, $grub2_prolog) if (defined $grub2_config);