linguini1 commented on issue #18805:
URL: https://github.com/apache/nuttx/issues/18805#issuecomment-4364673911
After looking into this issue further, it appears the problem is:
`__STDC_VERSION___ = 201710L` with my compiler, which means that the shim
definition of `ATOMIC_VAR_INIT` is not being defined. However, the definition
isn't pulled from anywhere else. Either:
- The check should be `__STDC_VERSION__ >= 201710L`
- OR my toolchain should be finding some other `<stdatomic.h>` definition
but it isn't
The clang toolchain's `stdatomic.h` says:
```c
#if ((defined(__stdc_version__) && __stdc_version__ >= 201710l &&
\
__stdc_version__ < 202311l) ||
\
(defined(__cplusplus) && __cplusplus >= 202002l)) &&
\
!defined(_clang_disable_crt_deprecation_warnings)
/* atomic_var_init was deprecated in c17 and c++20. */
#pragma clang deprecated(atomic_var_init)
#endif
```
which leads me to believe that the check should use `>=`.
`riscv-none-elf-gcc` has the following definition in `stdatomic.h`:
```c
#if defined(__CLANG_ATOMICS)
#define ATOMIC_VAR_INIT(value) (value)
#define atomic_init(obj, value) __c11_atomic_init(obj, value)
#else
#define ATOMIC_VAR_INIT(value) { .__val = (value) }
#define atomic_init(obj, value) ((void)((obj)->__val = (value)))
#endif
```
So it should be defined properly. Maybe this header is not getting found
properly somehow.
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