esp-idf/components/linux/CMakeLists.txt

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CMake
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idf_build_get_property(target IDF_TARGET)
if(NOT "${target}" STREQUAL "linux")
return()
endif()
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set(includes "include")
if(CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin")
list(APPEND srcs getrandom.c assert_func.c)
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else()
list(APPEND srcs fls.c)
list(APPEND includes "linux_include")
endif()
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idf_component_register(INCLUDE_DIRS ${includes}
REQUIRED_IDF_TARGETS linux
SRCS ${srcs})
if(${IDF_TARGET} STREQUAL "linux")
find_library(LIB_BSD bsd)
if(LIB_BSD)
target_link_libraries(${COMPONENT_LIB} PRIVATE ${LIB_BSD})
elseif(NOT CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin")
message(WARNING "Missing LIBBSD library. Install libbsd-dev package and/or check linker directories.")
endif()
endif()