Fix IDF 4.3 atomic 64 exchange (#62)

* Fix IDF 4.3 atomic 64 exchange

* Conditional strip

* Update

Author: pablogs9

CMakeLists.txt

@@ -30,6 +30,8 @@ externalproject_add(libmicroros_project
             IDF_PATH=${IDF_PATH}
             IDF_TARGET=${IDF_TARGET}
             APP_COLCON_META=${APP_COLCON_META}
+            IDF_VERSION_MAJOR=${IDF_VERSION_MAJOR}
+            IDF_VERSION_MINOR=${IDF_VERSION_MINOR}
     INSTALL_COMMAND ""
     BUILD_BYPRODUCTS ${COMPONENT_DIR}/libmicroros.a
     )

libmicroros.mk

@@ -97,6 +97,9 @@ ifeq ($(IDF_TARGET),$(filter $(IDF_TARGET),esp32s2 esp32c3))
 		mkdir $(UROS_DIR)/atomic_workaround; cd $(UROS_DIR)/atomic_workaround; \
 		$(AR) x $(UROS_DIR)/install/lib/librcutils.a; \
 		$(STRIP) atomic_64bits.c.obj --strip-symbol=__atomic_fetch_add_8; \
+		if [ $(IDF_VERSION_MAJOR) -ge 4 ] && [ $(IDF_VERSION_MINOR) -ge 3 ]; then \
+			$(STRIP) atomic_64bits.c.obj --strip-symbol=__atomic_exchange_8; \
+		fi; \
 		$(AR) rc -s librcutils.a *.obj; \
 		cp -rf librcutils.a  $(UROS_DIR)/install/lib/librcutils.a; \
 		rm -rf $(UROS_DIR)/atomic_workaround; \