Merge topic 'FindBoost-fphsa'

634f6ea159 FindBoost: Add new unit tests
a22dd5d8be FindBoost: Modernize module mode with FPHSA
a315977595 FindBoost: Fix and modernize config mode with FPHSA
24342d5ef7 FindBoost: Add vars Boost_VERSION_MACRO/MAJOR/MINOR/PATCH/COUNT
26634752d0 FindBoost: Introduce new imported target Boost::headers
d6c12f374d FindBoost: Compare versions consistently against Boost_VERSION_STRING

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3243

Help/release/dev/FindBoost-fphsa.rst

@@ -0,0 +1,31 @@
+FindBoost-fphsa
+---------------
+
+* The :module:`FindBoost` module was reworked to expose a more
+  consistent user experience between its config and module modes
+  and with other find modules in general.
+
+  * A new imported target ``Boost::headers`` is now defined (same
+    as ``Boost::boost``).
+
+  * New output variables ``Boost_VERSION_MACRO``,
+    ``Boost_VERSION_MAJOR``, ``Boost_VERSION_MINOR``,
+    ``Boost_VERSION_PATCH``, and ``Boost_VERSION_COUNT``
+    were added.
+
+  * The internal logic for determining the value for
+    ``Boost_FOUND``, for version and component checks, and
+    for reporting the result to the user was replaced with
+    the :module:`FindPackageHandleStandardArgs` module. (This
+    fixed a bug that sometimes printed wrong status
+    messages in config mode.)
+
+  * The ``QUIET`` argument passed to :command:`find_package` is no
+    longer ignored in config mode.
+
+  * *Known issue*: The CMake package shipped with Boost ``1.70.0``
+    ignores the ``QUIET`` argument passed to :command:`find_package`.
+    This is fixed in the next Boost release.
+
+  * The input switch ``Boost_DETAILED_FAILURE_MSG`` was
+    removed.