This section attempts to answer all these questions. We will mostly discuss `CPPFLAGS' in our examples, but actually the answer holds for all the compile flags used in Automake: `CCASFLAGS', `CFLAGS', `CPPFLAGS', `CXXFLAGS', `FCFLAGS', `FFLAGS', `GCJFLAGS', `LDFLAGS', `LFLAGS', `RFLAGS', and `YFLAGS'.
Maybe you could add a small clarification: that LDADD and LIBADD are automake-specific variables. As far as I understand, there is a mumble_LDADD and a LDADD, but not an AM_LDADD, and plain LDADD is not from the user. Thus LDADD and LIBADD are entirely different from the *FLAGS variables. Is that correct?
It may sound obvious, but I find it confusing =) -- Leonardo Boiko
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