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cmake: make Enzyme Apple dynamic_lookup opt-in #2670

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Merged
wsmoses merged 1 commit into from
Jan 26, 2026
Merged

cmake: make Enzyme Apple dynamic_lookup opt-in #2670

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3 changes: 3 additions & 0 deletions enzyme/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,9 @@ option(ENZYME_FLANG "Build enzyme flang symlink" OFF)
option(ENZYME_MLIR "Build enzyme mlir plugin" OFF)
option(ENZYME_IFX "Enable enzyme support for the Intel Fortran compiler IFX" OFF)
option(ENZYME_EXTERNAL_SHARED_LIB "Build external shared library" OFF)
option(ENZYME_APPLE_DYNAMIC_LOOKUP
"On Apple, link Enzyme shared library with -flat_namespace/-undefined,dynamic_lookup instead of linking LLVM"
OFF)
option(ENZYME_STATIC_LIB "Build static library" OFF)
option(ENZYME_WARN_COMPILER "Warn if enzyme detects potentially incompatible compiler" ON)
set(ENZYME_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
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10 changes: 9 additions & 1 deletion enzyme/Enzyme/CMakeLists.txt
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Expand Up @@ -145,7 +145,15 @@ if (${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)

if (APPLE AND ENZYME_APPLE_DYNAMIC_LOOKUP)
target_link_options(Enzyme-${LLVM_VERSION_MAJOR} PRIVATE
"-Wl,-flat_namespace"
"-Wl,-undefined,dynamic_lookup")
else()
target_link_libraries(Enzyme-${LLVM_VERSION_MAJOR} LLVM)
endif()

install(TARGETS Enzyme-${LLVM_VERSION_MAJOR}
EXPORT EnzymeTargets
LIBRARY DESTINATION lib COMPONENT shlib
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