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