Below is the "bootstrap" rule in gcc5.2.0's Makefile. What I don't
get is the meaning
of the @: at the beginning of the seventh line. I couldn't find it in
the manual.
I only know that @ before a shell command makes that command executed
but not displayed,
but why add the : ?
.PHONY: bootstrap bootstrap-lean
bootstrap:
echo stage3 > stage_final
@r=`${PWD_COMMAND}`; export r; \
s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
$(MAKE) $(RECURSE_FLAGS_TO_PASS) stage3-bubble
@: $(MAKE); $(unstage)
@r=`${PWD_COMMAND}`; export r; \
s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
TFLAGS="$(STAGE3_TFLAGS)"; \
$(MAKE) $(TARGET_FLAGS_TO_PASS) all-host all-target
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