Do not show NAMESPACE_API macros in Doxygen output.

Doxyfile

@@ -1951,7 +1951,8 @@ INCLUDE_FILE_PATTERNS  =
 # recursively expanded use the := operator instead of the = operator.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-PREDEFINED             = LB_UNUSED:=
+PREDEFINED             = LB_UNUSED:= @UPPER_PROJECT_NAME@_API:= \
+                         @DOXYGEN_PREDEFINED_MACROS@
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
 # tag can be used to specify a list of macro names that should be expanded. The

DoxygenRule.cmake

@@ -4,20 +4,22 @@
 # TargetHooks installed by Common and must be included after all targets!
 #
 # Input Variables
-# * DOXYGEN_PROJECT_NAME the name to use in the documentation title. Defaults
-#   to PROJECT_NAME if not provided.
-# * DOXYGEN_PROJECT_BRIEF A short description of the project. Defaults to
-#   ${UPPER_PROJECT_NAME}_DESCRIPTION if not provided.
-# * DOXYGEN_MAINPAGE_MD markdown file to use as main page. See
-#   USE_MDFILE_AS_MAINPAGE doxygen documentation for details.
-# * DOXYGEN_EXTRA_INPUT additional parsed input files, appended to INPUT in
-#   Doxyfile
 # * DOXYGEN_EXTRA_EXCLUDE additional excluded input files, appended to EXCLUDE
 #   in Doxyfile
 # * DOXYGEN_EXTRA_FILES additional files to be copied to documentation,
 #   appended to HTML_EXTRA_FILES in Doxyfile
+# * DOXYGEN_EXTRA_INPUT additional parsed input files, appended to INPUT in
+#   Doxyfile
 # * DOXYGEN_EXTRA_STYLESHEET additional css style sheet to assign to the
 #   HTML_EXTRA_STYLESHEET variable in Doxyfile
+# * DOXYGEN_MAINPAGE_MD markdown file to use as main page. See
+#   USE_MDFILE_AS_MAINPAGE doxygen documentation for details.
+# * DOXYGEN_PREDEFINED_MACROS additional input to the PREDEFINED variable in
+#   Doxyfile.
+# * DOXYGEN_PROJECT_BRIEF A short description of the project. Defaults to
+#   ${UPPER_PROJECT_NAME}_DESCRIPTION if not provided.
+# * DOXYGEN_PROJECT_NAME the name to use in the documentation title. Defaults
+#   to PROJECT_NAME if not provided.
 #
 # Optional project information
 # Output to a metadata file for html index page generation by Jekyll