Support for Darwin clang toolchain

[itsManjeet]

Added CMake configurations to support build on darwin clang toolchain.
Tested for following configurations

• ARCH=aarch64 CRYPTO=openssl TOOLCHAIN=CLANG

[steven-bellock]

Please squash your commits into one commit. Also, is this still a work-in-progress or is it ready for review?

[itsManjeet]

Hi @steven-bellock,
This is still a work in progress. The GitHub CI setup is not yet complete—so far, only the FIPS build pass has been implemented.

[jyao1]

@itsManjeet , please don't use "merge" directly.

Please always use "rebased and merge" in your local, before submit the PR.

[steven-bellock]

From 22-Sep-2025 meeting, would be good to add support to libspdm first so that issues can be caught before syncing to spdm-emu.

[jyao1]

@itsManjeet , could you please submit PR to https://github.com/DMTF/libspdm?

[itsManjeet]

DMTF/libspdm#3284

[jyao1]

I see you add Darwin for all CIs.

Do you have estimation on how long they will take?

[itsManjeet]

Not sure about the exact numbers but CI on my fork took around 20min

[jyao1]

I feel 20 min for Darwin is too long.
We already covered GCC and Visual Studio.
Is there any code you believe that is Darwin specific?

[itsManjeet]

yes, darwin kill tasks if run with make -j nproc, so using j1, make if way slow.

Nope, nothing special in darwin build, only toolchain setup in CMakeLists.txt for darwin, so yes, we can skip darwin CI

[steven-bellock]

yes, darwin kill tasks if run with make -j nproc, so using j1, make if way slow.

@itsManjeet see DMTF/libspdm#3362.