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(doc): set cmake c++ compatible standard when building on MacOS CPU. (#23483)

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Signed-off-by: teekenl <teekenlau@gmail.com>
Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
Co-authored-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
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TeeKen Lau 2025-09-16 23:08:46 +10:00 committed by GitHub
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docs/getting_started/installation/cpu/apple.inc.md
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@ -52,6 +52,24 @@ uv pip install -e .
1 error generated.
```
---
If the build fails with C++11/C++17 compatibility errors like the following, the issue is that the build system is defaulting to an older C++ standard:
```text
[...] error: 'constexpr' is not a type
[...] error: expected ';' before 'constexpr'
[...] error: 'constexpr' does not name a type
```
**Solution**: Your compiler might be using an older C++ standard. Edit `cmake/cpu_extension.cmake` and add `set(CMAKE_CXX_STANDARD 17)` before `set(CMAKE_CXX_STANDARD_REQUIRED ON)`.
To check your compiler's C++ standard support:
```bash
clang++ -std=c++17 -pedantic -dM -E -x c++ /dev/null | grep __cplusplus
```
On Apple Clang 16 you should see: `#define __cplusplus 201703L`
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