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find_program(CMAKE_C_COMPILER NAMES gcc cc)
if(NOT CMAKE_C_COMPILER)
message(FATAL_ERROR "C compiler not found!")
endif()
set(OUTPUT_FILE ${CMAKE_BINARY_DIR}/libhello_c.so)
add_custom_command(
OUTPUT ${OUTPUT_FILE}
COMMAND ${CMAKE_C_COMPILER} -shared -fPIC -o ${OUTPUT_FILE} ${CMAKE_CURRENT_SOURCE_DIR}/hello.c
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/hello.c
COMMENT "Compiling hello_c shared library..."
)
add_custom_target(hello_c ALL DEPENDS ${OUTPUT_FILE})
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