[llvm] [PowerPC][AIX] Remove flag for no semantic interposition (PR #168109)

[Lei Huang via llvm-commits]

https://github.com/lei137 updated https://github.com/llvm/llvm-project/pull/168109

>From f4306cc639c4710d88c0c36ff1c92e64b02c636b Mon Sep 17 00:00:00 2001
From: Lei Huang <lei at ca.ibm.com>
Date: Fri, 14 Nov 2025 19:21:48 +0000
Subject: [PATCH] [PowerPC][AIX] Remove flag for no semantic interposition

Remove flag to sepcifcy "no semantic interposition" since this is
the default for AIX.
---
 llvm/cmake/modules/HandleLLVMOptions.cmake | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index 22ecf4dcee368..fdd3509f03f59 100644
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -450,13 +450,16 @@ if( LLVM_ENABLE_PIC )
     # Enable interprocedural optimizations for non-inline functions which would
     # otherwise be disabled due to GCC -fPIC's default.
     # Note: GCC<10.3 has a bug on SystemZ.
-    #
+    # Note: Default on AIX is "no semantic interposition".
     # Note: Clang allows IPO for -fPIC so this optimization is less effective.
     # Clang 13 has a bug related to -fsanitize-coverage
     # -fno-semantic-interposition (https://reviews.llvm.org/D117183).
-    if ((CMAKE_COMPILER_IS_GNUCXX AND
-         NOT (LLVM_NATIVE_ARCH STREQUAL "SystemZ" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.3))
-       OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND CMAKE_CXX_COMPILER_VERSION GREATER_EQUAL 14))
+    if ((NOT ("${CMAKE_SYSTEM_NAME}" MATCHES "AIX"))
+        AND ((CMAKE_COMPILER_IS_GNUCXX AND
+              NOT (LLVM_NATIVE_ARCH STREQUAL "SystemZ"
+                   AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.3))
+             OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang"
+                 AND CMAKE_CXX_COMPILER_VERSION GREATER_EQUAL 14)))
       add_flag_if_supported("-fno-semantic-interposition" FNO_SEMANTIC_INTERPOSITION)
     endif()
   endif()