Initial commit of AIX port (#1231)

This PR is for enabling AIX porting of onnxruntime_genai.

Below are detailed info.

- build.py
    Calling the util.is_aix() which is introduced for aix platform check
- cmake/global_variables.cmake
Updating the ONNXRUNTIME_LIB and adding check of CMAKE_SYSTEM_PROCESSOR
- cmake/ortlib.cmake
    Setting onnxruntime header path for ORT_HEADER_DIR
- examples/c/CMakeLists.txt
    Update for ONNXRUNTIME_GENAI_LIB and ONNXRUNTIME_GENAI_DEPENDENCY
- tools/python/util/__init__.py
   import is_aix
- tools/python/util/platform_helpers.py
    is_aix() for aix platform check.

Author: ranjitshs

build.py

@@ -644,7 +644,7 @@ def clean(args: argparse.Namespace, env: dict[str, str]):
 
 
 if __name__ == "__main__":
-    if not (util.is_windows() or util.is_linux() or util.is_mac()):
+    if not (util.is_windows() or util.is_linux() or util.is_mac() or util.is_aix()):
         raise OSError(f"Unsupported platform {sys.platform}.")
 
     arguments = _parse_args()

cmake/global_variables.cmake

@@ -56,7 +56,12 @@ elseif(APPLE)
     set(ONNXRUNTIME_PROVIDERS_ROCM_LIB "libonnxruntime_providers_rocm.dylib")
   endif()
 else()
-  set(ONNXRUNTIME_LIB "libonnxruntime.so")
+  #In AIX, only CPU inferencing is supported, so no need to update ONNXRUNTIME_PROVIDERS_CUDA_LIB and ONNXRUNTIME_PROVIDERS_ROCM_LIB
+  if (CMAKE_SYSTEM_NAME MATCHES "AIX")
+    set(ONNXRUNTIME_LIB "libonnxruntime.a")
+  else()
+    set(ONNXRUNTIME_LIB "libonnxruntime.so")
+  endif()
   set(ONNXRUNTIME_PROVIDERS_CUDA_LIB "libonnxruntime_providers_cuda.so")
   set(ONNXRUNTIME_PROVIDERS_ROCM_LIB "libonnxruntime_providers_rocm.so")
 endif()
@@ -142,6 +147,8 @@ else()
     set(genai_target_platform "arm64")
   elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(x86_64|amd64)$")
     set(genai_target_platform "x64")
+  elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "powerpc")
+    set(genai_target_platform "powerpc")
   else()
     message(FATAL_ERROR "Unsupported architecture. CMAKE_SYSTEM_PROCESSOR: ${CMAKE_SYSTEM_PROCESSOR}")
   endif()

cmake/ortlib.cmake

@@ -12,6 +12,9 @@ if(ORT_HOME)
   elseif (IOS OR MAC_CATALYST)
     set(ORT_HEADER_DIR ${ORT_HOME}/Headers)
     set(ORT_LIB_DIR ${ORT_HOME}/)
+  elseif (CMAKE_SYSTEM_NAME MATCHES "AIX")
+    set(ORT_HEADER_DIR ${ORT_HOME}/include/onnxruntime)
+    set(ORT_LIB_DIR ${ORT_HOME}/lib)
   else()
     set(ORT_HEADER_DIR ${ORT_HOME}/include)
     set(ORT_LIB_DIR ${ORT_HOME}/lib)

examples/c/CMakeLists.txt

@@ -27,6 +27,9 @@ if(WIN32)
 elseif(APPLE)
   set(ONNXRUNTIME_GENAI_LIB "libonnxruntime-genai.dylib")
   set(ONNXRUNTIME_GENAI_DEPENDENCY "*.dylib")
+elseif(CMAKE_SYSTEM_NAME MATCHES "AIX")
+  set(ONNXRUNTIME_GENAI_LIB "libonnxruntime-genai.a")
+  set(ONNXRUNTIME_GENAI_DEPENDENCY "*.a")
 else()
   set(ONNXRUNTIME_GENAI_LIB "libonnxruntime-genai.so")
   set(ONNXRUNTIME_GENAI_DEPENDENCY "*.so")

tools/python/util/__init__.py

@@ -4,5 +4,5 @@
 from .logger import get_logger
 from .run import run
 from .android import *
-from .platform_helpers import is_linux, is_mac, is_windows
+from .platform_helpers import is_linux, is_mac, is_windows, is_aix
 from .dependency_resolver import download_dependencies, copy_dependencies

tools/python/util/platform_helpers.py

@@ -14,3 +14,6 @@ def is_mac():
 
 def is_linux():
     return sys.platform.startswith("linux")
+
+def is_aix():
+    return sys.platform.startswith("aix")