[llvm] bb0a95d - [CMake] handle the AIX form of the lto cache dir option (#168868)

[Wael Yehia via llvm-commits]

Author: David Tenty
Date: 2025-11-20T15:27:45Z
New Revision: bb0a95d5b16dabd8e64c6672ec381215a144d92d

URL: https://github.com/llvm/llvm-project/commit/bb0a95d5b16dabd8e64c6672ec381215a144d92d
DIFF: https://github.com/llvm/llvm-project/commit/bb0a95d5b16dabd8e64c6672ec381215a144d92d.diff

LOG: [CMake] handle the AIX form of the lto cache dir option (#168868)

This handles the AIX form of the thinLTO cache dir option, which get's
turned on when thinLTO is enabled.

Added: 
    

Modified: 
    llvm/cmake/modules/HandleLLVMOptions.cmake

Removed: 
    


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diff  --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index fdd3509f03f59..2d78626d953c9 100644
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -1339,6 +1339,9 @@ if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")
   if(APPLE)
     append("-Wl,-cache_path_lto,${LLVM_THINLTO_CACHE_PATH}"
            CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
+  elseif("${CMAKE_SYSTEM_NAME}" MATCHES "AIX")
+    append("-bplugin_opt:-legacy-thinlto-cache-dir=${LLVM_THINLTO_CACHE_PATH}"
+           CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
   elseif((UNIX OR MINGW) AND LLVM_USE_LINKER STREQUAL "lld")
     append("-Wl,--thinlto-cache-dir=${LLVM_THINLTO_CACHE_PATH}"
            CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)