Use symbol file to export symbols in onnxruntime library on AIX platform as well

[ayappanec]

On AIX platform , the exporting of symbols in libonnxruntime library is handled through onnxruntime_c_api.cc and CMake itself. Because of which it exports lot of symbols but misses out OrtSessionOptionsAppendExecutionProvider_CPU.

This change is to make the symbol exports on AIX platform similar to how it is done for other platforms.

[ayappanec]

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[ayappanec]

Team, Can this be reviewed please ? These changes will remove few AIX specific conditions from the cmake file.

[ranjitshs]

@tianleiwu @snnn
Please review the changes in this PR . Thanks.

[Copilot]

Pull request overview

This PR updates the AIX shared-library build to export libonnxruntime symbols via the same generated symbol file mechanism used on other platforms, instead of relying on AIX-specific symbol exporting behavior from onnxruntime_c_api.cc/CMake. This addresses missing exports like OrtSessionOptionsAppendExecutionProvider_CPU by ensuring AIX consumes the provider symbols.txt lists.

Changes:

• Extend tools/ci_build/gen_def.py to support an aix output style that emits a plain per-line export list.
• Enable symbol-file generation on AIX (remove AIX exclusion) and link onnxruntime on AIX using -bE:<exportfile> with AIX_EXPORT_ALL_SYMBOLS disabled.
• Simplify AIX shared-lib target creation and dependencies to follow the same generated-source/symbol-file flow as other UNIX platforms.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tools/ci_build/gen_def.py	Adds an aix export-list output style (one symbol name per line, no header).
cmake/onnxruntime.cmake	Switches AIX to use the generated symbol file + linker export list (-bE) and removes AIX-only build branches.

---

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[tianleiwu]

Review Summary

Clean refactoring that eliminates AIX-specific special-casing in the build system by integrating AIX into the common gen_def.py symbol-file generation path. The change is low-risk, reduces code duplication, and correctly applies AIX-appropriate linker flags (-bE:, AIX_EXPORT_ALL_SYMBOLS OFF). Net deletion of 11 lines with no functional behavior change on non-AIX platforms.

Positives:

• Good elimination of five separate AIX conditional blocks in favor of platform-appropriate integration into the common flow.
• Correctly sets AIX_EXPORT_ALL_SYMBOLS OFF and uses LINKER:-bE:${SYMBOL_FILE} — mirrors the intent of --version-script on Linux and -exported_symbols_list on macOS.
• Now correctly includes LINK_DEPENDS ${SYMBOL_FILE} for AIX, ensuring relinking when the export list changes.
• The gen_def.py "aix" style correctly generates plain symbol names matching the AIX -bE: export file format.

One trivial nitpick flagged inline.

[ayappanec]

Thanks @tianleiwu