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libLLVM.a doesn't exist, so fix how enzyme is linking LLVM #21

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merged 1 commit into from
May 4, 2025
Merged

libLLVM.a doesn't exist, so fix how enzyme is linking LLVM #21

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15 changes: 14 additions & 1 deletion enzyme/Enzyme/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -145,7 +145,20 @@ if (${ENZYME_EXTERNAL_SHARED_LIB})
add_dependencies(Enzyme-${LLVM_VERSION_MAJOR} BlasDeclarationsIncGen)
add_dependencies(Enzyme-${LLVM_VERSION_MAJOR} BlasTAIncGen)
add_dependencies(Enzyme-${LLVM_VERSION_MAJOR} BlasDiffUseIncGen)
target_link_libraries(Enzyme-${LLVM_VERSION_MAJOR} LLVM)

# This would be the desired way to link against LLVM components,
# however this function is bugged and does not work with `all`, see:
# https://github.com/llvm/llvm-project/issues/46347
#llvm_map_components_to_libnames(llvm_libs all)
# Therefore, manually invoke llvm-config
execute_process(COMMAND ${LLVM_TOOLS_BINARY_DIR}/llvm-config --libs all
OUTPUT_VARIABLE llvm_libraries)
string(STRIP "${llvm_libraries}" llvm_libraries)
# In theory, adding --libs should also add all the -l flags,
# but it isn't picked up correctly by clang, so we call target_link_libraries
set_target_properties(Enzyme-${LLVM_VERSION_MAJOR} PROPERTIES
LINK_FLAGS "`${LLVM_TOOLS_BINARY_DIR}/llvm-config --ldflags`")
target_link_libraries(Enzyme-${LLVM_VERSION_MAJOR} ${llvm_libraries})
install(TARGETS Enzyme-${LLVM_VERSION_MAJOR}
EXPORT EnzymeTargets
LIBRARY DESTINATION lib COMPONENT shlib
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