Add links to build profiles from other related pages

Author: theotherjimmy

docs/reference/configuration/configuration.md

@@ -13,6 +13,8 @@ The Arm Mbed OS configuration system gathers and interprets the configuration de
 
 <span class="notes">**Note:** In prior releases, the configuration system provided a method for adding custom targets. The Mbed OS tools now look for custom targets in a file named `custom_targets.json` in the root of an application and treat custom targets the same as [Mbed targets](/docs/development/tools/adding-and-configuring-targets.html).</span>
 
+<span class="notes">**Note:** This document only deals with passing macros to part of the toolchain suite. For documentation about how to control other flags to the compiler see the [build profiles documentation](/docs/latest/tools/CLI/build_profiles.html).</span>
+
 ### Examining available configuration parameters
 
 Mbed CLI includes a command for listing and explaining the compile time configuration, `mbed compile --config`. This command prints a summary of configuration parameters, such as:

docs/tools/build_rules.md

@@ -1,6 +1,6 @@
 ## Mbed OS build rules
 
-The Mbed OS build tools scan your project for source files every time you compile. This document describes the rules that the build tools use to decide which source files to include in each build. The Mbed OS build tools use the [target configuration](adding-and-configuring-targets.html) found in `targets.json`, `mbed_app.json` and `mbed_lib.json` as input to these rules.
+The Mbed OS build tools scan your project for source files every time you compile. This document describes the rules that the build tools use to decide which source files to include in each build. The Mbed OS build tools use the [target configuration](adding-and-configuring-targets.html) found in `targets.json`, `mbed_app.json` and `mbed_lib.json` as input to these rules. If you are looking for how to pass options to the compilers, please see the [build profiles documentation](http://os.mbed.com/docs/latest/tools/CLI/build_profiles.html).
 
 The build tools include every source file found in the project unless it is in a label directory, it is in a test directory or it matches a pattern in an `.mbedignore file`.