W-M-R opened a new pull request, #21351:
URL: https://github.com/apache/nuttx/pull/21351
## Summary
Prepare the in-tree compiler-rt support for LLVM 21.
1. Add the builtins introduced by LLVM 21 to the exclusion lists, in both
`CMakeLists.txt` and `Make.defs`, so the in-tree copies are not compiled
when the toolchain already provides them:
- bfloat16 conversions: `trunctfbf2.c`, `truncxfbf2.c`, `extendbfsf2.c`
- float128 conversions: `extendhfxf2.c`, `truncxfhf2.c`, `truncxfbf2.c`
2. Adapt `InstrProfilingPlatform.c` to the LLVM 21 profile API. The vtable
profiling hooks `__llvm_profile_begin_vtables()`,
`__llvm_profile_end_vtables()`, `__llvm_profile_begin_vtabnames()` and
`__llvm_profile_end_vtabnames()` are now provided, replacing the old
`__llvm_profile_begin_orderfile()` stub that LLVM 21 no longer references.
3. Bump the default `LIB_COMPILER_RT_VERSION` from 17.0.1 to 21.1.1 so the
bundled runtime matches the current toolchain.
## Impact
- Only affects builds with `CONFIG_BUILTIN_COMPILER_RT` /
`CONFIG_LIB_COMPILER_RT`;
the default configuration is unchanged.
- The version is a default only: it can still be overridden through
`CONFIG_LIB_COMPILER_RT_VERSION` when building with an older toolchain.
- No effect on hardware, documentation or security.
## Testing
Host: Ubuntu 22.04 x86_64, LLVM/Clang 21.1.1.
- Built the `sim` and `mps3-an547:gcov` configurations with
`CONFIG_LIB_COMPILER_RT=y`; `libclang_rt.builtins` and
`libclang_rt.profile` link without duplicate symbol errors (previously
`trunctfbf2` / `truncxfbf2` / `extendbfsf2` were defined twice).
- Verified `__llvm_profile_*` symbol resolution with `nm` on the resulting
`libclang_rt.profile.a`.
- Ran the `gcov` dump path on `sim` to confirm the profile runtime still
initializes and writes data.
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