libc-abis

   1 # Definition of features which introduce new libc ABI versions.  This
   2 # file is used to create a header file with definitions for the various
   3 # versions.  The static linker will encode in the EI_ABIVERSION field in
   4 # the e_ident array in the ELF program header the required ABI version.
   5 # This is not a bitmask.  The maximum ABI version required must be
   6 # encoded.
   7 #
   8 # Adding new features should always happen by appending new lines.  Never
   9 # add entries in the middle or where they seem "logical".  Once a version
  10 # is assigned to a feature it must not change again.  Since some features
  11 # are conditionally added this can only ever be done securely without much
  12 # risk is by adding at the end.
  13 #
  14 # The following lines have one of two formats:
  15 #
  16 #       SYMBOL
  17 # With just a symbol on the line this is the name of a feature which
  18 # is architecture independent.
  19 #
  20 #       SYMBOL  PLATFORM
  21 # Using this form architecture (and platform) dependent features can be
  22 # specified.  The PLATFORM name can use the wildcards available in
  23 # the Bourne shell's case expression.
  24 #
  25 # Note that the same symbol can be used using different platform triples.
  26 # They don't have to be in the same order relative to other entries.  This
  27 # can happen if the feature is implemented for different architectures
  28 # at different times.
  29 #
  30 # This file is parsed by a script which produces a header file containing
  31 # a single enum definition.  An extra symbol is added as entry zero to
  32 # specify the default ABI with number 0 and an artificial last entry is
  33 # added to allow computing the maximum ABI version for the platform.
  34 #
  35 # Feature Name  Configuration
  36 # ------------  -------------
  37 #
  38 # Unique symbol definitions for C++.
  39 # Architecture independent, all ELF targets (== all targets)
  40 UNIQUE
  41 #
  42 # Indirect PLT relocations.  Architecture dependent.
  43 IFUNC           x86_64-*-linux*
  44 IFUNC           i?86-*-linux*
  45 IFUNC           powerpc64-*-linux*
  46 IFUNC           powerpc-*-linux*
  47 IFUNC           sparc64-*-linux*
  48 IFUNC           sparc-*-linux*
  49 # Absolute (SHN_ABS) symbols working correctly.
  50 ABSOLUTE