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2021-07-07T13:20:38.736164Z
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Add deprecation notice for WITH_PROFILE option

As discussed on freebsd-current [1] and freebsd-arch [2] and review
D30833, FreeBSD 14 will ship without the _p.a libraries built with -pg.
Both upstream and base system (in commit b762974cf4b9) Clang have been
modified to remove the special case for linking against these libraries.

Clang's -pg support and mcount() remain, so building with -pg can still
be used on code that the user builds; we just do not provide prebuilt
libraries compiled with -pg.  A similar change is still needed for GCC.

[1]  https://lists.freebsd.org/pipermail/freebsd-current/2020-January/075105.html
[2] https://lists.freebsd.org/archives/freebsd-arch/2021-June/000016.html

MFC after:	1 week
Sponsored by:	The FreeBSD Foundation

(cherry picked from commit 175841285e289edebb6603da39f02549521ce950)

Clarify notice for profiled libraries in FreeBSD 14

Reported by:	kevans
Fixes:		175841285e28 ("Add deprecation notice for...")
Sponsored by:	The FreeBSD Foundation

(cherry picked from commit f94360971e649fa684ef3b7e72839b59c7242bdb)

Git Hash:   c3e6df3967f9a64322ad493e0ecd7e8cffba018f
Git Author: emaste@FreeBSD.org
END