Fix build failure when both CUDA and MiGraphX execution providers are enabled (#27798)
### Description
`arena_extend_strategy` was defined in separate `#if defined(USE_CUDA)`
and `#if defined(USE_MIGRAPHX)` preprocessor blocks, causing a
redefinition error when both providers are enabled.
Consolidates the definition and extern declaration into a single
combined guard:
```cpp
#if defined(USE_MIGRAPHX) || defined(USE_CUDA) || defined(USE_CUDA_PROVIDER_INTERFACE)
onnxruntime::ArenaExtendStrategy arena_extend_strategy = onnxruntime::ArenaExtendStrategy::kNextPowerOfTwo;
#endif
```
Both files updated:
- `onnxruntime/python/onnxruntime_pybind_state_common.cc` — variable
definition
- `onnxruntime/python/onnxruntime_pybind_state_common.h` — extern
declaration
No other duplicate symbols found across CUDA/MiGraphX conditional
blocks.
### Motivation and Context
Building with `--use_cuda --use_migraphx` fails with:
```
error: redefinition of 'onnxruntime::ArenaExtendStrategy onnxruntime::python::arena_extend_strategy'
```
Both providers share this config variable; it just needs a unified
guard.
<!-- START COPILOT ORIGINAL PROMPT -->
<details>
<summary>Original prompt</summary>
>
> ----
>
> *This section details on the original issue you should resolve*
>
> <issue_title>[Build] Cannot build with cuda and migraphx</issue_title>
> <issue_description>### Describe the issue
>
> My laptop has an nvidia dgpu and an amd igpg. To build with cuda and
migraphx I had to edit
onnxruntime/python/onnxruntime_pybind_state_common.cc to remove one of
the two onnxruntime::ArenaExtendStrategy arena_extend_strategy =
onnxruntime::ArenaExtendStrategy::kNextPowerOfTwo;
>
> ```
> #if defined(USE_CUDA) || defined(USE_CUDA_PROVIDER_INTERFACE)
> // TODO remove deprecated global config
> OrtCudnnConvAlgoSearch cudnn_conv_algo_search =
OrtCudnnConvAlgoSearchExhaustive;
> // TODO remove deprecated global config
> bool do_copy_in_default_stream = true;
> // TODO remove deprecated global config
> onnxruntime::cuda::TunableOpInfo tunable_op{};
> onnxruntime::CUDAExecutionProviderExternalAllocatorInfo
external_allocator_info{};
> // TODO remove deprecated global config
> onnxruntime::ArenaExtendStrategy arena_extend_strategy =
onnxruntime::ArenaExtendStrategy::kNextPowerOfTwo;
> #endif
>
> #if defined(USE_MIGRAPHX)
> // TODO remove deprecated global config
> onnxruntime::ArenaExtendStrategy arena_extend_strategy =
onnxruntime::ArenaExtendStrategy::kNextPowerOfTwo;
> #endif
> ```
>
> I think it could be changed to
> ```
> #if defined(USE_CUDA) || defined(USE_CUDA_PROVIDER_INTERFACE)
> // TODO remove deprecated global config
> OrtCudnnConvAlgoSearch cudnn_conv_algo_search =
OrtCudnnConvAlgoSearchExhaustive;
> // TODO remove deprecated global config
> bool do_copy_in_default_stream = true;
> // TODO remove deprecated global config
> onnxruntime::cuda::TunableOpInfo tunable_op{};
> onnxruntime::CUDAExecutionProviderExternalAllocatorInfo
external_allocator_info{};
> // TODO remove deprecated global config
> #endif
>
> #if defined(USE_MIGRAPHX) || defined(USE_CUDA) ||
defined(USE_CUDA_PROVIDER_INTERFACE)
> // TODO remove deprecated global config
> onnxruntime::ArenaExtendStrategy arena_extend_strategy =
onnxruntime::ArenaExtendStrategy::kNextPowerOfTwo;
> #endif
> ```
>
> ### Urgency
>
> _No response_
>
> ### Target platform
>
> AMD + Nvidia setups
>
> ### Build script
>
> ./build.sh --config Release --build_shared_lib --build_wheel
--parallel 12 --skip_tests --use_cuda --cuda_home /opt/cuda --cudnn_home
/opt/cuda --use_tensorrt --tensorrt_home /usr --use_openvino CPU
--use_migraphx --migraphx_home /opt/rocm --cmake_extra_defines
CMAKE_CXX_FLAGS="-Wno-maybe-uninitialized -Wno-free-nonheap-object"
CMAKE_CUDA_ARCHITECTURES="120"
>
> ### Error / output
>
>
/home/someone/onnxruntime-3.13/onnxruntime/onnxruntime/python/onnxruntime_pybind_state_common.cc:36:34:
error: redefinition of ‘onnxruntime::ArenaExtendStrategy
onnxruntime::python::arena_extend_strategy’
> 36 | onnxruntime::ArenaExtendStrategy arena_extend_strategy =
onnxruntime::ArenaExtendStrategy::kNextPowerOfTwo;
> | ^~~~~~~~~~~~~~~~~~~~~
>
/home/someone/onnxruntime-3.13/onnxruntime/onnxruntime/python/onnxruntime_pybind_state_common.cc:31:34:
note: ‘onnxruntime::ArenaExtendStrategy
onnxruntime::python::arena_extend_strategy’ previously defined here
> 31 | onnxruntime::ArenaExtendStrategy arena_extend_strategy =
onnxruntime::ArenaExtendStrategy::kNextPowerOfTwo;
> | ^~~~~~~~~~~~~~~~~~~~~
>
> ### Visual Studio Version
>
> na
>
> ### GCC / Compiler Version
>
> gcc version 15.2.1 20260209 (GCC)</issue_description>
>
> <agent_instructions>Please create a pull request, and check whether
there are other places that enabling both cuda and migraphx might cause
build errors.</agent_instructions>
>
> ## Comments on the Issue (you are @copilot in this section)
>
> <comments>
> </comments>
>
</details>
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- Fixes microsoft/onnxruntime#27797
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onnxruntime
8941f8c1 - Fix build failure when both CUDA and MiGraphX execution providers are enabled (#27798)
