esp-idf/components/cxx/component.mk

# Mark __cxa_guard_dummy as undefined so that implementation of static guards 
# is taken from cxx_guards.o instead of libstdc++.a
COMPONENT_ADD_LDFLAGS += -u __cxa_guard_dummy

ifndef CONFIG_CXX_EXCEPTIONS
# If exceptions are disabled, ensure our fatal exception
# hooks are preferentially linked over libstdc++ which
# has full exception support
COMPONENT_ADD_LDFLAGS += -u __cxx_fatal_exception
endif
cxx: implement static initialization guards 2017-01-05 00:25:55 +08:00			`# Mark __cxa_guard_dummy as undefined so that implementation of static guards`
			`# is taken from cxx_guards.o instead of libstdc++.a`
build system: Use component.mk for all components, refactor bootloader build For config-only components, component.mk should now contain "COMPONENT_CONFIG_ONLY := 1" Also refactored some of the generation of linker paths, library list. This required cleaning up the way the bootloader project works, it's now mostly independent from the parent. 2017-06-23 14:08:01 +10:00			`COMPONENT_ADD_LDFLAGS += -u __cxa_guard_dummy`
cxx: Add KConfig option for C++ exceptions, disable by default Fixes https://github.com/espressif/esp-idf/issues/1072 (Additional 20KB is still used if C++ exception support is enabled in menuconfig.) 2017-10-04 17:29:21 +11:00
			`ifndef CONFIG_CXX_EXCEPTIONS`
			`# If exceptions are disabled, ensure our fatal exception`
			`# hooks are preferentially linked over libstdc++ which`
			`# has full exception support`
			`COMPONENT_ADD_LDFLAGS += -u __cxx_fatal_exception`
			`endif`