Hi,

Today’s meeting minutes:

https://docs.google.com/document/d/1IQKBK-GcJNZG0O9QArqYfvb6Huk5xHscN-XIGEZr-z8/

Notes/Minutes

Status updates

• Wayne: PR22668:
• Metaware linker doesn’t have some primitives which are supported in gnu linker, ld.
• Metaware doesn’t have same binutils, but GNU binutils can be used in this case
• Compiling / linking / testing
• Kernel space tests not big problem
• Sections related operations not working, for example user space
• Compiler supports most assembly primitives also used in GNU toolchain
• Biggest challenges in linker
• Some arcs (for example ARM) requires placement on word sized addresses
  This poses challenges on Metaware Linker
  (The Metaware compiler is llvm based, but the linker is not)
• Work is still ongoing in relation to debug information / elf file.
• Will re-base into latest Zephyr
• Thomas: IAR: Get basic hello world compiling
• Progressing, but slower than expected.
• Able to compile
• Issue discovered:
• IAR only accepts a single pre-include, but CMake generates at least two in Zephyr.
  Looking into a workaround on this.
• Torsten: Toolchain abstraction: Issue:#16031, Status
• Have been building up detailed knowledge of current design.
  Have gotten knowledge from Sebastian Bøe. Have some ideas regarding improved design, which will also impact PR22668:
• Has CMake Toolchain support in mind, for any change being made, to prepare for toolchain file support.
• Note: Toolchain file support will require some consideration regarding flags controlled using Kconfig, but which users may define in toolchains file, examples: Optimization level, debug flags.
• Feedback:
• Reduced number of files that must be updated when adding additional toolchain.
• If possible, provide some kind of template to make it easier to get started
• LLVM: Draft PR Created by Kumar: https://github.com/zephyrproject-rtos/zephyr/pull/22981
  Zephyr CI has been updated to LLVM 10, but has not been tried
  LLVM can compile hellow_world, but could not run on some platforms (qemu).
  Believed to be caused by inline assembly.
  General suggestion to pull out common assembly related changes from toolchain PRs (#22668, #22981, others ?) into a common PR for assembly changes that benefit multiple toolchains.
• Existing action points, not covered above:
• Clean-up offset.h to make it easier to support more compilers: Nothing new
• Exploration work on CI Toolchain test cases: Nothing new.
• Everyone is still urged to give feedback on PR#22668 in areas that they know about.

Short term goals:

• Toolchain test cases
• Test cases should not be ordinary Zephyr tests

Could be completely different test system with focus on:

• Optimization
• Linker
• archive
• Should test features that is known to be used inside Zephyr
• Determine what is most important to test / ensure support for.
• Needs to work with any toolchain, also out-of-tree toolchains.

Best regards

Torsten T. Rasmussen