`LLVM 20.1.0` change in `clang-runtimes` names

[matsobdev]

Version 20.1.0 changes armv8m.main_soft_nofp to armv8m.main_soft_nofp_unaligned, thus: https://github.com/raspberrypi/pico-sdk/blob/ee68c78d0afae2b69c03ae1a72bf5cc267a2d94c/cmake/preload/toolchains/pico_arm_cortex_m33_clang.cmake#L4 need to reflect that change. There are armv6m_soft_nofp and armv6m_soft_nofp_unaligned as well, but diff says they're the same.

[kilograham]

sorry, can you give some more context. what is the effect of the Clang change. What does the fix do? What happens if you do nothing

[matsobdev]

Upon no action, SDK in unable to locate default picolibc (release binary: https://github.com/arm/arm-toolchain/releases/download/release-20.1.0-ATfE/ATfE-20.1.0-Linux-x86_64.tar.xz) from the toolchain:

PICO_SDK_PATH is /home/mateush/Dysk_RAM/pico-sdk-2.1.1
Target board (PICO_BOARD) is 'pico2'.
Using board configuration from /home/mateush/Dysk_RAM/pico-sdk-2.1.1/src/boards/include/boards/pico2.h
Pico Platform (PICO_PLATFORM) is 'rp2350-arm-s'.
Configuring toolchain based on PICO_COMPILER 'pico_arm_cortex_m33_clang'
CMake Error at /home/mateush/Dysk_RAM/pico-sdk-2.1.1/cmake/preload/toolchains/util/pico_arm_clang_common.cmake:92 (message):
  Could not find an llvm runtime for ''
Call Stack (most recent call first):
  /home/mateush/Dysk_RAM/pico-sdk-2.1.1/cmake/preload/toolchains/pico_arm_cortex_m33_clang.cmake:8 (include)
  /home/mateush/cmake/share/cmake-3.19/Modules/CMakeDetermineSystem.cmake:123 (include)
  CMakeLists.txt:44 (project)


CMake Error: CMake was unable to find a build program corresponding to "Ninja".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
-- Configuring incomplete, errors occurred!
No such file or directory
CMake Error: Generator: execution of make failed. Make command was:  &&

Names has been changed as stated above:

adding _unaligned suffix. Changing the name in the toolchain or inside: https://github.com/raspberrypi/pico-sdk/blob/ee68c78d0afae2b69c03ae1a72bf5cc267a2d94c/cmake/preload/toolchains/pico_arm_cortex_m33_clang.cmake#L4 so they will correspond again is sufficient to make it compile again without any errors.

PS. It is a workaround, but I throw everything but armv6m and armv8m soft hard anyway, to get rid of 2 GB of a dead weight, so changing names there is good enough for me.

[kilograham]

"treats x as y" != "x has been renamed to y" :-) but ok, understand now, thanks

[matsobdev]

Bad wording of mine, I'm still learning :D

[kilograham]

fix merged into develop