Fix Doxygen documentation build error in onnxruntime_c_api.h (#27083)
# Fix Doxygen documentation build errors from recent PRs
Fixes multiple Doxygen errors introduced by recent API additions that
cause the nightly documentation build to fail (`WARN_AS_ERROR=YES`).
## Root Cause Analysis
| Error | File | Line | Introduced By | Commit | Fix |
|-------|------|------|---------------|--------|-----|
| Duplicate `\addtogroup Global` | onnxruntime_c_api.h | 973 | PR #26828
- OrtExternalResourceImporter API | c54be3c7 | Remove redundant group
markers |
| Unresolved `::SetSessionLogSeverityLevel()` | onnxruntime_c_api.h |
1065 | PR #26971 - CreateEnvWithOptions API | 3874516d | Use
`OrtApi::SetSessionLogSeverityLevel` |
| Unresolved `::RunOptionsSetRunLogSeverityLevel()` |
onnxruntime_c_api.h | 1066 | PR #26971 - CreateEnvWithOptions API |
3874516d | Use `OrtApi::RunOptionsSetRunLogSeverityLevel` |
| `<ep_name>` interpreted as HTML | onnxruntime_c_api.h | 1119 | PR
#26971 - CreateEnvWithOptions API | 3874516d | Escape as `\<ep_name\>` |
| `\param[in] importer` not found | onnxruntime_c_api.h | 7982 | PR
#26828 - OrtExternalResourceImporter API | c54be3c7 | Use `\param[in]
input` (macro expands to `input`) |
| `\param[in] handle` not found | onnxruntime_c_api.h | 8025 | PR #26828
- OrtExternalResourceImporter API | c54be3c7 | Use `\param[in] input` |
| `\param[in] handle` not found | onnxruntime_c_api.h | 8091 | PR #26828
- OrtExternalResourceImporter API | c54be3c7 | Use `\param[in] input` |
| Unresolved `::CreateLoopKernel()` | onnxruntime_ep_c_api.h | 667 | PR
#26927 - Control flow kernels API | 1ed8fd90 | Use
`OrtEpApi::CreateLoopKernel` |
| Unresolved `::CreateScanKernel()` | onnxruntime_ep_c_api.h | 710 | PR
#26927 - Control flow kernels API | 1ed8fd90 | Use
`OrtEpApi::CreateScanKernel` |
| `<ep_name>` interpreted as HTML | onnxruntime_ep_c_api.h | 1434 | PR
#26971 - CreateEnvWithOptions API | 3874516d | Escape as `\<ep_name\>` |
| `\param[out] out` not found | onnxruntime_ep_c_api.h | 1440 | PR
#26971 - CreateEnvWithOptions API | 3874516d | Use `\param[out]
config_entries` |
## Summary by PR
| PR | Issues |
|----|--------|
| **#26828** (c54be3c7) - OrtExternalResourceImporter API for D3D12 |
Duplicate Doxygen group, incorrect `\param` names for
`ORT_CLASS_RELEASE` macros |
| **#26927** (1ed8fd90) - Control flow kernels API | `::Method()` syntax
unresolvable by Doxygen |
| **#26971** (3874516d) - CreateEnvWithOptions API | `::Method()`
syntax, `<ep_name>` HTML interpretation, incorrect param name |
## Technical Details
### `ORT_CLASS_RELEASE` Macro Issue
The `ORT_CLASS_RELEASE(X)` macro at line 164 expands to:
```cpp
void(ORT_API_CALL * Release##X)(_Frees_ptr_opt_ Ort##X * input)
```
The parameter is always named `input`, but the documentation in PR
#26828 used semantic names like `importer` and `handle`. Doxygen
validates `\param` names against actual parameter names in the expanded
code.
### Doxygen Link Resolution
Doxygen 1.9.8 cannot resolve `::MethodName()` as a link to a method. The
correct syntax is to qualify with the struct name: `OrtApi::MethodName`.
## Testing
Verified locally with Doxygen 1.9.8 (matches CI configuration).