Under Set Compiler Options->Paths, the -B option does not work.
I specify the path "my_project", and the make file contains:
TESTAPP_PERIPHERAL_CC_SEARCH = -Bmy_project
This variable is never used, and the final GCC invocation does not include the switch.
The -B switch has been deprecated, so the tools will ignore its use. The switch will be completely removed from the software in a future release.