svn commit: r308314 - head/usr.bin/sed

[Konstantin Belousov]

On Fri, Nov 04, 2016 at 08:49:59PM +0000, Pedro F. Giffuni wrote:
> Author: pfg
> Date: Fri Nov  4 20:49:59 2016
> New Revision: 308314
> URL: https://svnweb.freebsd.org/changeset/base/308314
> 
> Log:
>   sed(1): add LEGACY_BSDSED_COMPAT compile-time flag.
>   
>   In r297602, which included a __FreeBSD_version bump to 1100105, we changed
>   sed 'i' and 'a' from discarding whitespaces to conform with what GNU and
>   sysvish sed do.
>   
>   There are arguments in favor of keeping the old behavior but the new
>   behavior is also useful for migration purposes. It seems important to at
>   least consider the case of developers depending on the previous behavior,
>   so add a CFLAG to enable the old behaviour.
If such legacy behavior appears to be useful or even important for
real-world scenarios, I think that an environment variable controlling
it is more practical and traditional than the recompilation.