[syslinux] Feature Request - Allow calling of labels from other labels

[Ryan McLean]

My config looks as follows:

------------------------------------------
# Default boot option to use
DEFAULT vesamenu.c32

# Prompt user for selection
PROMPT 0

# Time until default is selected
TIMEOUT 100

# Menu Configuration
MENU WIDTH 80
MENU MARGIN 10
MENU PASSWORDMARGIN 3
MENU ROWS 12
MENU TABMSGROW 18
MENU CMDLINEROW 18
MENU ENDROW 24
MENU PASSWORDROW 11
MENU TIMEOUTROW 20
MENU TITLE 32Bit (x86) RHES 3.x OS Choice

# Vesa Options
#
MENU INCLUDE gfx/default

# Return to Main Menu
LABEL MainMenu
    MENU DEFAULT
    MENU LABEL ^Main Menu
    KERNEL vesamenu.c32

#
# Latest Release
#
LABEL latest
    MENU LABEL ^Latest Release
      KERNEL knl/vmlinuz-rhes38-x86
      APPEND initrd=img/initrd-rhes38-x86.img ks=
http://kickstart/ks/cam/x86/rhes/38.cfg

#
# Blank boots
#
LABEL linux-38
    MENU LABEL ^Blank Boot 3.8
    KERNEL knl/vmlinuz-rhes38-x86
    APPEND initrd=img/initrd-rhes38-x86.img

LABEL linux-30
    MENU LABEL Blank Boot 3.0
    KERNEL knl/vmlinuz-rhes3-x86
    APPEND initrd=img/initrd-rhes3-x86.img

#
# All Builds
#
LABEL v3u8
    MENU LABEL Update ^8
      KERNEL knl/vmlinuz-rhes38-x86
      APPEND initrd=img/initrd-rhes38-x86.img ks=
http://kickstart/ks/cam/x86/rhes/38.cfg

LABEL v3u7
    MENU LABEL Update ^7
      KERNEL knl/vmlinuz-rhes3-x86
      APPEND initrd=img/initrd-rhes3-x86.img ks=
http://kickstart/ks/cam/x86/rhes/37.cfg

LABEL v3u5
    MENU LABEL Update ^5
      KERNEL knl/vmlinuz-rhes35-x86
      APPEND initrd=img/initrd-rhes35-x86.img ks=
http://kickstart/ks/cam/x86/rhes/35.cfg

-------------------------

As you can see the "latest" one is an exact copy of one of the other
options  (v3u8).
In the above eg it isn't too bad but some of my other configs are a lot
bigger and contain multiple versions of multiple linux distros.

I would like to have  something along the lines of:

LABEL latest
    MENU LABEL ^Latest Release
    CALL LABEL v3u8

This would allow me to easily maintain the latest version(s) in a list As i
would not have to update multiple lines of the config.

Regards,

Ryan McLean