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Summary: For builds with LLVM_BUILD_LLVM_DYLIB=ON and BUILD_SHARED_LIBS=OFF this change makes all symbols in the target specific libraries hidden by default. A new macro called LLVM_EXTERNAL_VISIBILITY has been added to mark symbols in these libraries public, which is mainly needed for the definitions of the LLVMInitialize* functions. This patch reduces the number of public symbols in libLLVM.so by about 25%. This should improve load times for the dynamic library and also make abi checker tools, like abidiff require less memory when analyzing libLLVM.so One side-effect of this change is that for builds with LLVM_BUILD_LLVM_DYLIB=ON and LLVM_LINK_LLVM_DYLIB=ON some unittests that access symbols that are no longer public will need to be statically linked. Before and after public symbol counts (using gcc 8.2.1, ld.bfd 2.31.1): nm before/libLLVM-9svn.so | grep ' [A-Zuvw] ' | wc -l 36221 nm after/libLLVM-9svn.so | grep ' [A-Zuvw] ' | wc -l 26278 Reviewers: chandlerc, beanz, mgorny, rnk, hans Reviewed By: rnk, hans Subscribers: merge_guards_bot, luismarques, smeenai, ldionne, lenary, s.egerton, pzheng, sameer.abuasal, MaskRay, wuzish, echristo, Jim, hiraditya, michaelplatings, chapuni, jholewinski, arsenm, dschuff, jyknight, dylanmckay, sdardis, nemanjai, jvesely, javed.absar, sbc100, jgravelle-google, aheejin, kbarton, fedor.sergeev, asb, rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, jrtc27, zzheng, edward-jones, mgrang, atanasyan, rogfer01, MartinMosbeck, brucehoult, the_o, PkmX, jocewei, kristina, jsji, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D54439
34 lines
1.1 KiB
CMake
34 lines
1.1 KiB
CMake
list(APPEND LLVM_COMMON_DEPENDS intrinsics_gen)
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list(APPEND LLVM_TABLEGEN_FLAGS -I ${LLVM_MAIN_SRC_DIR}/lib/Target)
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add_llvm_component_library(LLVMTarget
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Target.cpp
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TargetIntrinsicInfo.cpp
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TargetLoweringObjectFile.cpp
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TargetMachine.cpp
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TargetMachineC.cpp
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ADDITIONAL_HEADER_DIRS
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${LLVM_MAIN_INCLUDE_DIR}/llvm/Target
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)
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# When building shared objects for each target there are some internal APIs
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# that are used across shared objects which we can't hide.
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if (NOT BUILD_SHARED_LIBS AND NOT APPLE)
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# Set default visibility to hidden, so we don't export all the Target classes
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# in libLLVM.so.
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set(CMAKE_CXX_VISIBILITY_PRESET hidden)
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endif()
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foreach(t ${LLVM_TARGETS_TO_BUILD})
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message(STATUS "Targeting ${t}")
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add_subdirectory(${t})
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endforeach()
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# Currently we do not allow libraries from lib to reference targets directly.
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# This property is used to enforce that convention. It is important because the
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# logic in llvm_map_components_to_libnames is order dependent on the target
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# libraries being created.
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set_property(GLOBAL PROPERTY LLVM_TARGETS_CONFIGURED On)
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