# Include the header twice to detect missing include guard.
quiet_cmd_hdrtest = HDRTEST $<
cmd_hdrtest = \
- $(CC) $(c_flags) -S -o /dev/null -x c /dev/null \
+ $(CC) $(c_flags) -fsyntax-only -x c /dev/null \
$(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \
$(PERL) $(srctree)/$(src)/headers_check.pl $(obj) $(SRCARCH) $<; \
touch $@