[Bug 213474] sed behavior change with a/i/c operands.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213474

Pedro F. Giffuni <pfg at FreeBSD.org> changed:

           What    |Removed                     |Added
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 Attachment #175892|0                           |1
        is obsolete|                            |

--- Comment #3 from Pedro F. Giffuni <pfg at FreeBSD.org> ---
Created attachment 175985
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=175985&action=edit
Add a CFLAG to re-enable FreeBSD 10 behavior

The new behavior in FBSD 11+, is also present in SYSV UNIX. The new behavior
should help people migrating from Solaris as well as linux so I think it should
be the default.

It still looks convenient and easy to add a CFLAG (LEGACY_BSDSED_COMPAT) to
make it easier to re-enable the old behavior.

I am not convinced we should go as far as adding a new build option for this,
but at least this should make it easier to custom-build a sed that supports the
old behavior.

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