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diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -305,6 +305,17 @@
# On Windows all code is PIC. MinGW warns if -fPIC is used.
else()
add_flag_or_print_warning("-fPIC" FPIC)
+ # Enable interprocedural optimizations for non-inline functions which would
+ # otherwise be disabled due to GCC -fPIC's default.
+ #
+ # Note: Clang allows IPO for -fPIC so this optimization is less effective.
+ # Older Clang may support -fno-semantic-interposition but it used local
+ # aliases to optimize global variables, which is incompatible with copy
+ # relocations due to -fno-pic.
+ if (CMAKE_COMPILER_IS_GNUCXX OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND
+ CMAKE_CXX_COMPILER_VERSION GREATER_EQUAL 13))
+ add_flag_if_supported("-fno-semantic-interposition" FNO_SEMANTIC_INTERPOSITION)
+ endif()
endif()
# GCC for MIPS can miscompile LLVM due to PR37701.
if(CMAKE_COMPILER_IS_GNUCXX AND LLVM_NATIVE_ARCH STREQUAL "Mips" AND
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