Make sure that your Arm Compiler version is up to date – I think support for this flag is relatively recent (6.18ish). I’m unable to reproduce this error with 6.20:

    $ make CC=armclang CFLAGS=-fstack-usage
    $ find build -name '*.su'
    build/fvp/release/libfdt/fdt_wip.su

    build/fvp/release/libfdt/fdt.su

    build/fvp/release/libfdt/fdt_rw.su
    ...

The stack usage is dumped as expected, e.g. build/fvp/release/bl31/psci_on.su:

    lib/psci/psci_on.c:59:psci_cpu_on_start            48           static

    lib/psci/psci_on.c:163:psci_cpu_on_finish        48           static

Chris

From: Bhuvaneswari K via TF-A <tf-a@lists.trustedfirmware.org>
Date: Friday, 10 November 2023 at 07:30
To: tf-a@lists.trustedfirmware.org <tf-a@lists.trustedfirmware.org>
Subject: [TF-A] Re: Stack usage

sorry not able to include image so here is my error

armclang: error: unknown argument: `-fstack-usage`
armclang: error: unknown argument:  `-fdump-ipa-cgraph`
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