llext: disable LL_EXTENSION_SYMBOL when not building an llext (baa3b6a5) · Commits · Wenxi XU / zephyr

The LL_EXTENSION_SYMBOL macro is used to export a symbol to the base image. When CONFIG_LLEXT is not defined, or the file is being compiled outside of an llext, the macro is not useful and would leave orphan sections in the final image instead. This patch adds the LL_EXTENSION_BUILD definition to the llext build process, and uses it to stub out the symbol-defining macro when not building an llext. Signed-off-by:

Luca Burelli <l.burelli@arduino.cc>

cmake/modules/extensions.cmake

+1 −0

Original line number	Diff line number	Diff line
		@@ -5394,6 +5394,7 @@ function(add_llext_target target_name)

		target_compile_definitions(${llext_lib_target} PRIVATE
		$<TARGET_PROPERTY:zephyr_interface,INTERFACE_COMPILE_DEFINITIONS>
		LL_EXTENSION_BUILD
		)
		target_compile_options(${llext_lib_target} PRIVATE
		${zephyr_filtered_flags}

include/zephyr/llext/symbol.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -114,12 +114,16 @@ struct llext_symtable {
		*
		* @param x Extension symbol to export to the base image
		*/
		#if defined(CONFIG_LLEXT) && defined(LL_EXTENSION_BUILD)
		#define LL_EXTENSION_SYMBOL(x) \
		static const struct llext_const_symbol \
		Z_GENERIC_SECTION(".exported_sym") __used \
		x ## _sym = { \
		.name = STRINGIFY(x), .addr = (const void *)&x, \
		}
		#else
		#define LL_EXTENSION_SYMBOL(x)
		#endif

		/**
		* @}

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