[PATCH] D102090: [CMake][ELF] Link libLLVM.so and libclang-cpp.so with -Bsymbolic-functions

[Fangrui Song via Phabricator via cfe-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG4f05f4c8e66b: [CMake][ELF] Link libLLVM.so and libclang-cpp.so with -Bsymbolic-functions (authored by MaskRay).

Changed prior to commit:
  https://reviews.llvm.org/D102090?vs=345268&id=345270#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D102090/new/

https://reviews.llvm.org/D102090

Files:
  clang/tools/clang-shlib/CMakeLists.txt
  llvm/tools/llvm-shlib/CMakeLists.txt


Index: llvm/tools/llvm-shlib/CMakeLists.txt
===================================================================
--- llvm/tools/llvm-shlib/CMakeLists.txt
+++ llvm/tools/llvm-shlib/CMakeLists.txt
@@ -50,6 +50,11 @@
       # Solaris ld does not accept global: *; so there is no way to version *all* global symbols
       set(LIB_NAMES -Wl,--version-script,${LLVM_LIBRARY_DIR}/tools/llvm-shlib/simple_version_script.map ${LIB_NAMES})
     endif()
+    # Optimize function calls for default visibility definitions to avoid PLT and
+    # reduce dynamic relocations.
+    # Note: for -fno-pic default, the address of a function may be different from
+    # inside and outside libLLVM.so.
+    target_link_options(LLVM PRIVATE LINKER:-Bsymbolic-functions)
   elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
     set(LIB_NAMES -Wl,-all_load ${LIB_NAMES})
   endif()
Index: clang/tools/clang-shlib/CMakeLists.txt
===================================================================
--- clang/tools/clang-shlib/CMakeLists.txt
+++ clang/tools/clang-shlib/CMakeLists.txt
@@ -48,3 +48,8 @@
                   ${_OBJECTS}
                   LINK_LIBS
                   ${_DEPS})
+# Optimize function calls for default visibility definitions to avoid PLT and
+# reduce dynamic relocations.
+if (NOT APPLE)
+  target_link_options(clang-cpp PRIVATE LINKER:-Bsymbolic-functions)
+endif()


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