esp-idf/components/newlib/CMakeLists.txt

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CMake
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if(BOOTLOADER_BUILD)
# Bootloader builds need the platform_include directory (for assert.h), but nothing else
idf_component_register(INCLUDE_DIRS platform_include)
return()
endif()
set(srcs
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"abort.c"
"heap.c"
"locks.c"
"poll.c"
"pthread.c"
"random.c"
"reent_init.c"
"newlib_init.c"
"syscalls.c"
"termios.c"
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"stdatomic.c"
"time.c")
set(include_dirs platform_include)
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if(CONFIG_SPIRAM_CACHE_WORKAROUND)
set(ldfragments esp32-spiram-rom-functions-c.lf)
endif()
list(APPEND ldfragments newlib.lf)
idf_component_register(SRCS "${srcs}"
INCLUDE_DIRS "${include_dirs}"
PRIV_INCLUDE_DIRS priv_include
PRIV_REQUIRES soc
LDFRAGMENTS "${ldfragments}")
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# Toolchain libraries require code defined in this component
idf_component_get_property(newlib newlib COMPONENT_LIB)
target_link_libraries(${COMPONENT_LIB} INTERFACE c m gcc "$<TARGET_FILE:${newlib}>")
set_source_files_properties(heap.c PROPERTIES COMPILE_FLAGS -fno-builtin)
# Forces the linker to include heap, syscall, pthread and retargetable locks from this component,
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# instead of the implementations provided by newlib.
list(APPEND EXTRA_LINK_FLAGS "-u newlib_include_heap_impl")
list(APPEND EXTRA_LINK_FLAGS "-u newlib_include_syscalls_impl")
list(APPEND EXTRA_LINK_FLAGS "-u newlib_include_pthread_impl")
target_link_libraries(${COMPONENT_LIB} INTERFACE "${EXTRA_LINK_FLAGS}")
if(CONFIG_NEWLIB_NANO_FORMAT)
target_link_libraries(${COMPONENT_LIB} INTERFACE "--specs=nano.specs")
endif()
add_subdirectory(port)