Build issues on AIX for POWER10 and POWER11

[KV2773]

While building onnxruntime from source for AIX I ran into macro pre-defined errors for the POWER10 and POWER11 machines. This patch resolves the issue.

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[Copilot]

Pull request overview

This PR addresses build failures on AIX for POWER10 and POWER11 systems caused by macro redefinition errors. The fix reorders the inclusion of the system header <sys/systemcfg.h> to occur before defining fallback macros, and adds conditional guards to prevent redefining POWER_10 and POWER_10_ANDUP if they're already defined by the system.

Key Changes:

• Move #include <sys/systemcfg.h> before macro definitions to check system-provided macros first
• Add #if !defined(POWER_10) guard around fallback macro definitions
• Apply changes consistently in both runtime code and CMake build configuration

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
onnxruntime/core/mlas/lib/platform.cpp	Adds conditional guards around POWER_10 macro definitions for AIX platform detection, preventing redefinition errors when system headers already provide these macros
cmake/onnxruntime_mlas.cmake	Applies the same macro guard pattern in CMake compile checks to ensure consistent build configuration for POWER10 runtime detection on AIX

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[Copilot]

The guard only checks if POWER_10 is defined, but POWER_10_ANDUP (used on line 38) might not be defined by the system header. Consider also adding a guard for POWER_10_ANDUP:

#if !defined(POWER_10_ANDUP)
#define POWER_10_ANDUP (POWER_10)
#endif

This ensures POWER_10_ANDUP is always available even if the system header only defines POWER_10.

[KV2773]

@copilot open a new pull request to apply changes based on this feedback

[KV2773]

@copilot open a new pull request to apply changes based on this feedback

[KV2773]

@copilot open a new pull request to apply changes based on this feedback

[hariharans29]

/azp run Linux QNN CI Pipeline,Win_TRT_Minimal_CUDA_Test_CI,Windows ARM64 QNN CI Pipeline,Windows GPU Doc Gen CI Pipeline

[azure-pipelines]

Azure Pipelines successfully started running 4 pipeline(s).

[KV2773]

Updating the commit as mentioned by the @copilot.

[KV2773]

@copilot open a new pull request to apply changes based on this feedback

[hariharans29]

/azp run Linux QNN CI Pipeline,Win_TRT_Minimal_CUDA_Test_CI,Windows ARM64 QNN CI Pipeline,Windows GPU Doc Gen CI Pipeline

[azure-pipelines]

Azure Pipelines successfully started running 4 pipeline(s).

[hariharans29]

Maybe similar POWER_10_ANDUP gaurd here is in the other file ?

[KV2773]

Yea here also we can add that line checking for the POWER_10_ANDUP macro.