sensor-lorawan: only override config if missing

examples/build_all.sh

@@ -2,6 +2,8 @@
 
 NUM_JOBS=$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || 4)
 
+export TOCK_BUILDALL=1
+
 set -e
 set -u
 set -o pipefail

examples/lora/sensor-lorawan/Makefile

@@ -10,9 +10,15 @@ CXX_SRCS := $(wildcard *.cc)
 
 override CPPFLAGS += -DRADIOLIB_CLOCK_DRIFT_MS=9
 
-ifneq ($(CI),)
+# If we are building for a testing configuration (e.g. CI) then it's okay to
+# use the example config header. However, if someone is doing local testing,
+# especially of a different thing, we don't want to accidentally overwrite
+# the build obeject here with the example config when a real one exists.
+ifneq ($(TOCK_BUILDALL),)
+ifeq ($(wildcard radioConfig.h),)
 override CPPFLAGS += "-DRADIO_CONFIG_CI=radioConfig_example.h"
 endif
+endif
 
 # Use the libtock-c Make system
 EXTERN_LIBS += $(TOCK_USERLAND_BASE_DIR)/RadioLib