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Don't link libdl when cross-compiling #20522

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Don't link libdl when cross-compiling #20522

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5ac781f
Don't link libdl when cross-compiling (fixes baremetal -ldl link fail…
rascani Jun 22, 2026
2edbd8a
Merge branch 'main' into arm-baremetal-disable-dl
rascani Jun 25, 2026
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6 changes: 5 additions & 1 deletion CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -519,7 +519,11 @@ target_link_libraries(executorch_core PRIVATE program_schema)
if(ANDROID)
target_link_libraries(executorch_core PUBLIC log)
endif()
if(EXECUTORCH_USE_DL)
# Skip when cross-compiling: find_library() resolves the host libdl even for a
# bare-metal target (e.g. arm-none-eabi), which then links -ldl into the
# baremetal runner and fails ("cannot find -ldl"). dladdr() isn't used on those
# targets anyway. Per-target presets also set EXECUTORCH_USE_DL OFF explicitly.
if(EXECUTORCH_USE_DL AND NOT CMAKE_CROSSCOMPILING)
# Check if dl exists for this toolchain and only then link it.
find_library(DL_LIBRARY_EXISTS NAMES dl)
# Check if the library was found
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2 changes: 2 additions & 0 deletions tools/cmake/preset/arm_baremetal.cmake
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Expand Up @@ -29,6 +29,8 @@ set_overridable_option(EXECUTORCH_BUILD_EXECUTOR_RUNNER OFF)
set_overridable_option(EXECUTORCH_BUILD_EXTENSION_FLAT_TENSOR OFF)
set_overridable_option(EXECUTORCH_BUILD_EXTENSION_DATA_LOADER OFF)
set_overridable_option(EXECUTORCH_BUILD_ARM_BAREMETAL ON)
# Bare-metal has no libdl (see CMakeLists.txt EXECUTORCH_USE_DL block).
set_overridable_option(EXECUTORCH_USE_DL OFF)
set_overridable_option(EXECUTORCH_BUILD_KERNELS_QUANTIZED ON)
set_overridable_option(EXECUTORCH_BUILD_EXTENSION_RUNNER_UTIL ON)
set_overridable_option(EXECUTORCH_BUILD_CORTEX_M ON)
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2 changes: 2 additions & 0 deletions tools/cmake/preset/esp_baremetal.cmake
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Expand Up @@ -7,6 +7,8 @@ set(CMAKE_INSTALL_PREFIX "${CMAKE_BINARY_DIR}")
set_overridable_option(EXECUTORCH_BUILD_EXECUTOR_RUNNER OFF)
set_overridable_option(EXECUTORCH_BUILD_EXTENSION_FLAT_TENSOR OFF)
set_overridable_option(EXECUTORCH_BUILD_EXTENSION_DATA_LOADER OFF)
# Bare-metal has no libdl (see CMakeLists.txt EXECUTORCH_USE_DL block).
set_overridable_option(EXECUTORCH_USE_DL OFF)
set_overridable_option(EXECUTORCH_BUILD_KERNELS_QUANTIZED ON)
set_overridable_option(EXECUTORCH_BUILD_EXTENSION_RUNNER_UTIL ON)
set_overridable_option(EXECUTORCH_ENABLE_LOGGING ON)
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2 changes: 2 additions & 0 deletions tools/cmake/preset/zephyr.cmake
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Expand Up @@ -6,6 +6,8 @@

set_overridable_option(EXECUTORCH_BUILD_COREML OFF)
set_overridable_option(EXECUTORCH_ENABLE_EVENT_TRACER OFF)
# Bare-metal has no libdl (see CMakeLists.txt EXECUTORCH_USE_DL block).
set_overridable_option(EXECUTORCH_USE_DL OFF)
set_overridable_option(EXECUTORCH_BUILD_KERNELS_LLM OFF)
set_overridable_option(EXECUTORCH_BUILD_KERNELS_LLM_AOT OFF)
set_overridable_option(EXECUTORCH_BUILD_EXTENSION_DATA_LOADER OFF)
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