%% Lin George <[EMAIL PROTECTED]> writes:

  lg> My question is that, what is the relationship between CXXFLAG and
  lg> CPPFLAG. I have followed your method and dumped output to a file
  lg> called "implicit_rule". Then I use grep to find the relationship
  lg> between CXXFLAG and CPPFLAG -- they seem to be two individual
  lg> variables

Yes... that's why I said:

  > Actually it's not including in those variables,

  lg> without any relationship.

They do have a relationship: CPPFLAGS is also present in all the command
lines where CXXFLAGS is:

  lg> LINK.cc = $(CXX) $(CXXFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH)
  lg> COMPILE.cc = $(CXX) $(CXXFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c

That's why I said:

  > but it's included in the rules where those variables are used.

-- 
-------------------------------------------------------------------------------
 Paul D. Smith <[EMAIL PROTECTED]>          Find some GNU make tips at:
 http://www.gnu.org                      http://make.paulandlesley.org
 "Please remain calm...I may be mad, but I am a professional." --Mad Scientist


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