toolchain/external-toolchain/ext-tool.mk: Support non sysroot-able toolchains

Only copy the sysroot files if the toolchain was built with sysroot support.

Signed-off-by: Daniel Laird <daniel.j.laird@nxp.com>

toolchain/external-toolchain/ext-tool.mk

@@ -46,8 +46,8 @@ copy_toolchain_lib_root = \
 
 copy_toolchain_sysroot = \
 	SYSROOT_DIR=`$(TARGET_CC) -v 2>&1 | grep ^Configured | tr " " "\n" | grep -- "--with-sysroot" | cut -f2 -d=`; \
-	cp -a $${SYSROOT_DIR}/* $(STAGING_DIR)/ ; \
-	find $(STAGING_DIR) -type d | xargs chmod 755
+	if [ -n "$${SYSROOT_DIR}" ]; then cp -a $${SYSROOT_DIR}/* $(STAGING_DIR)/ ; \
+	find $(STAGING_DIR) -type d | xargs chmod 755; fi
 
 uclibc: dependencies $(TARGET_DIR)/lib/$(strip $(subst ",, $(BR2_TOOLCHAIN_EXTERNAL_LIB_C)))
 
@@ -59,4 +59,4 @@ $(TARGET_DIR)/lib/$(strip $(subst ",, $(BR2_TOOLCHAIN_EXTERNAL_LIB_C))):
 	for libs in $(strip $(subst ",, $(BR2_TOOLCHAIN_EXTERNAL_LIBS))); do \
 		$(call copy_toolchain_lib_root, $$libs, /lib, $(BR2_TOOLCHAIN_EXTERNAL_STRIP)); \
 	done
-	$(call copy_toolchain_sysroot)
+	$(call copy_toolchain_sysroot)