Add AIX support

[KV2773]

Patches for building ort-extension on AIX, related to big endianness and some aix specific headers.

[Copilot]

Pull request overview

This PR adds IBM AIX build support across the core shared library build and several bundled third-party dependencies, including handling of AIX-specific macro collisions and big-endian data parsing.

Changes:

• Add AIX-specific exported-symbol list support for the shared library and wire it into the build.
• Patch external dependencies (SentencePiece, OpenCV/libpng, dlib, dr_libs, BlingFire) to compile on AIX.
• Update the UGM tokenizer’s precompiled charsmap parsing to avoid strict-aliasing and handle big-endian hosts.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
shared/ortcustomops.exp	Adds an AIX export list for shared-library symbol exports.
shared/api/nemo_mel_spectrogram.h	Undefines hz on AIX to avoid macro collisions with parameter names.
operators/tokenizer/ugm_kernels.hpp	Uses memcpy for header reads and swaps bytes on big-endian systems.
operators/text/vector_to_string.hpp	Renames the std::hash parameter (no functional change).
CMakeLists.txt	Uses .exp exports on AIX and .ver version scripts on Linux/Android.
cmake/externals/sentencepieceproject.cmake	Adds AIX/enum patches to the SentencePiece patch set.
cmake/externals/sentencepieceproject_enum.patch	Forces ScriptType enum underlying type to int32_t.
cmake/externals/sentencepieceproject_aix.patch	Defines endianness macro handling for AIX in SentencePiece.
cmake/externals/rand_aix.patch	Adds AIX fixes to OpenCV sources (macro collision + ELF/auxv guards).
cmake/externals/opencv.cmake	Applies additional AIX-specific OpenCV patches during fetch.
cmake/externals/opencv_libpng_aix.patch	Enables libpng PowerPC VSX optimizations on AIX.
cmake/externals/dr_libs.cmake	Applies an AIX patch to dr_libs during fetch.
cmake/externals/dr_libs_aix.patch	Undefines hz on AIX for dr_mp3.
cmake/externals/dlib.cmake	Applies an AIX patch to dlib during fetch.
cmake/externals/dlib_aix.patch	Updates dlib’s embedded libpng VSX detection to include AIX.
cmake/externals/blingfire.cmake	Applies an AIX patch and links Iconv on AIX.
cmake/externals/blingfire-aix.patch	Adjusts BlingFire headers for AIX (but currently breaks macOS).

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[sayanshaw24]

CIs are still failing due to a corrupt patch, please try to repro by building locally and ensure all errors are fixed:

  Building Custom Rule E:/_work/1/s/out/Windows/_deps/dr_libs-subbuild/CMakeLists.txt
  No update step for 'dr_libs-populate'
  Performing patch step for 'dr_libs-populate'
CUSTOMBUILD : error : corrupt patch at line 6 [E:\_work\1\s\out\Windows\_deps\dr_libs-subbuild\dr_libs-populate.vcxproj]

[KV2773]

CIs are still failing due to a corrupt patch, please try to repro by building locally and ensure all errors are fixed:

  Building Custom Rule E:/_work/1/s/out/Windows/_deps/dr_libs-subbuild/CMakeLists.txt
  No update step for 'dr_libs-populate'
  Performing patch step for 'dr_libs-populate'
CUSTOMBUILD : error : corrupt patch at line 6 [E:\_work\1\s\out\Windows\_deps\dr_libs-subbuild\dr_libs-populate.vcxproj]

Hii @sayanshaw24 is it possible for the community to add a .gitattribute file similar to
https://github.com/microsoft/onnxruntime/blob/main/cmake/patches/.gitattributes
in cmake/externals/ folder
as I have tested by adding it on AIX,Linux, and Windows, it works fine, as making all platforms to use LF format for line endings.

[Copilot]

Pull request overview

Copilot reviewed 16 out of 16 changed files in this pull request and generated 6 comments.

[KV2773]

Hii @sayanshaw24 , may you review it once.