kc3-lang/libffi/libtool-version

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• Hash : 78556561
  Author :
  Date : 2020-02-21T19:08:06
  

  x86: Add indirect branch tracking support (#540)
  
  Intel Control-flow Enforcement Technology (CET):
  
  https://software.intel.com/en-us/articles/intel-sdm
  
  contains shadow stack (SHSTK) and indirect branch tracking (IBT).  When
  CET is enabled, ELF object files must be marked with .note.gnu.property
  section.  When Intel CET is enabled, include <cet.h> in assembly codes
  to mark Intel CET support.
  
  Also when IBT is enabled, all indirect branch targets must start with
  ENDBR instruction and notrack prefix can be used to disable IBT on
  indirect branch.  <cet.h> defines _CET_ENDBR which can be used in
  assembly codes for ENDBR instruction.  If <cet.h> isn't included,
  define _CET_ENDBR as empty so that _CET_ENDBR can be used in assembly
  codes.
  
  Trampoline must be enlarged to add ENDBR instruction unconditionally,
  which is NOP on non-CET processors.  This is required regardless if
  libffi is enabled with CET since libffi.so will be marked in legacy
  bitmap, but trampoline won't.  Update library version for larger
  FFI_TRAMPOLINE_SIZE.
  
  This fixed:
  
  https://github.com/libffi/libffi/issues/474
  
  Tested with
  
  $ CC="gcc -Wl,-z,cet-report=error -fcf-protection" CXX="g++ -Wl,-z,cet-report=error -fcf-protection" .../configure
  
  on Linux CET machines in i686, x32 and x86-64 modes.

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• libtool-version

• # This file is used to maintain libtool version info for libffi.  See
  # the libtool manual to understand the meaning of the fields.  This is
  # a separate file so that version updates don't involve re-running
  # automake.
  #
  # Here are a set of rules to help you update your library version
  # information:
  # 
  # 1. Start with version information of `0:0:0' for each libtool library.
  #
  # 2. Update the version information only immediately before a public
  #    release of your software. More frequent updates are unnecessary,
  #    and only guarantee that the current interface number gets larger
  #    faster.
  #
  # 3. If the library source code has changed at all since the last
  #    update, then increment revision (`c:r:a' becomes `c:r+1:a').
  #
  # 4. If any interfaces have been added, removed, or changed since the
  #    last update, increment current, and set revision to 0.
  #
  # 5. If any interfaces have been added since the last public release,
  #    then increment age.
  #
  # 6. If any interfaces have been removed since the last public
  #    release, then set age to 0.
  #
  # CURRENT:REVISION:AGE
  9:0:1
  

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