clang:libclang_rt.builtins-xxx.a supports builtin

[W-M-R]

Summary

1. enable CONFIG_BUILTIN_COMPILER_RT  to built libclang_rt.builtins-xxx.a and no longer use the compiler's built-in
2. Modify clang version acquisition to get two decimal points
3. It has been ported to support four architectures: ARM, ARM64, RISCV, and x86_64, among which ARM has been validated
4. Align the ported compile-rt library with the clang version downloaded by ci to 17.0.1

Impact

Testing

 There is a problem with testbuild.sh, which causes the config I uploaded using the clang compiler to fail verification. I will fix this problem in the next patch and upload a defconfig that supports compiling this builtin.

[nuttxpr]

[Experimental Bot, please feedback here]

This PR summary is incomplete to assess if it meets NuttX requirements. Here's a breakdown of what's missing and why it's important:

Missing Information in Summary

• Why is this change necessary? Is there a bug with the compiler's built-in implementation? Does this improve performance? A clear reason helps reviewers understand the PR's motivation.
• What functional part of the code is being changed? Be specific. Which files are affected? Mentioning "CONFIG_TOOLCHAINS_BUILTIN" gives a hint, but more context is needed.
• How does the change work? What are the technical steps involved? Simply stating "no longer use the compiler's built-in" is too vague.

Missing Information in Impact

• ALL sections are blank! This is the most critical part. The impact section helps assess:
  • Risk: Are there potential side effects on users, builds, hardware, etc.?
  • Testing Scope: What needs to be tested thoroughly based on the areas affected?
  • Documentation: Will users need guidance on this change?

Missing Information in Testing

• No build host details: What OS, CPU architecture, and compiler were used for testing?
• No target details: Which simulator or physical hardware was this tested on?
• No logs: Provide "before" and "after" logs demonstrating the change's effect.

Conclusion

This PR, in its current state, does not meet NuttX requirements. The missing information makes it impossible to evaluate the change effectively. Please provide the missing details to ensure your PR receives proper review.

[xiaoxiang781216]

@W-M-R please add a config to ensure the porting really work.

[W-M-R]

@W-M-R please add a config to ensure the porting really work.

OK, I'll turn on builtin by default

[xiaoxiang781216]

please rebase to fix the ci error

[W-M-R]

This CI result is a bit strange. The compiler clang used by Docker is 17.0.1, but it is inconsistent with the local compilation result of mine. I will to build a Docker to verify it latter.

[W-M-R]

There is a problem with testbuild.sh, which causes the config I uploaded using the clang compiler to fail verification. I will fix this problem in the next patch and upload a defconfig that supports compiling this builtin.