Specific migration related questions from 5.06 to 6.15

Hello support team and dear fellow engineers,

Brief: There exists an SDK based on the toolchain v5.06, the target is to migrate the sdk to toolchain v6.15. I am only interested in keil armcc toolchain migration to armclang toolchain at this moment.  

I have already looked around the community and the migration application note. Unfortunately, I could not find an answer for the following questions.

Would you let me know how to fix the following issues:

 1. --bss_threshold=0 is not supported in armclang compiler v6.15, what is the equivalent command should be used in a project?

 2. --feedback=".\unused_SoC.txt" is not supported in armclang compiler v6.15, what is the equivalent command should be used in a project?

 3. Scatter file:

Usecase: How to include directory path in v6.15 in a scatterfile?

v5.06

#! armcc -E -I .\,.\..,.\..\sdk\HAL_common_config,.\..\..\..\sdk\HAL_partnum_config\ --cpu Cortex-M0+

v6.15

#! armclang -E <how to include directory path? Write down the compatible command of v5.06 as shared above> --target=arm-arm-none-eabi -mcpu=cortex-m0plus

I look forward for your response, many thanks.