This issue was split from issue #1041

The "C/C++ Include Paths and Symbols" properties page class IncludesSymbolsPropertyPage was deprecated in 2010 (adfdd48) and re-activated in 2017 (d9b8eb3) by Doug.

The reason for reactivating was to create a backup for the user in case the build output parsing would fail to get all the compile options for indexing. So far I never ran into this issue, but I can imagine that users would appreciate this backup method in case the indexing goes wrong and the user sees false syntax errors.

The problem here is that it is not made clear to the user that the property page is only a backup for the indexer. It's not for setting extra include paths and macros for the build step. Any include path or macro specified here must also have been specified in the Makefile.