Merge branch 'np/sharing-preserved-copy/OTP-12590'

* np/sharing-preserved-copy/OTP-12590: (28 commits)
  Refactor have seq_trace token test
  Use sharing preserving copy error messages and exceptions
  Use sharing preserving copy in enif_make_copy
  Refactor sharing preserved copy flags
  Fix rebase of SHCOPY seq_tokens
  Fix erts_debug:copy_shared/1 prototype
  Update preloaded module erlang.beam
  Add erlang:copy_literals/2 spec
  Add copy_literals testcase
  Do not use GCC extensions in copy
  Use copy literal range check in message passing and purging
  Add BIF for setting internal copy literal range
  Copy literals in copy sharing
  Refactor copy sharing
  Add support for HAMT maps in preserved copy
  Fix Map preserved sharing copy implementation
  Fix Halfword removal
  Fix internal stacks
  Add support for maps in preserved copy
  Add --enable-sharing-preserving configure flag
  ...

1 files changed, 4 insertions, 0 deletions

diff --git a/configure.in b/configure.in
index e8c8680e19..51728a847e 100644
--- a/configure.in
+++ b/configure.in
@@ -278,6 +278,10 @@ AC_ARG_ENABLE(builtin-zlib,
 AS_HELP_STRING([--enable-builtin-zlib],
                [force use of our own built-in zlib]))
 
+AC_ARG_ENABLE(sharing-preserving,
+AS_HELP_STRING([--enable-sharing-preserving],
+               [enable copying of terms without destroying sharing]))
+
 dnl This functionality has been lost along the way... :(
 dnl It could perhaps be nice to reintroduce some day; therefore,
 dnl it is not removed just commented out.