Re: Preprocessing C++ only

[David Fang]

> SUFFIXES = .i
> noinst_DATA = Quadratic.i
> .cpp.i:
>       $(CPP) $(CPPFLAGS) -E -o $@ $<

Hi,
        Sometimes it is useful to distinguish C from C++ preprocessed
files, I use .ii for C++ and .i for C.  If you want to retain the
CFLAGS/CXXFLAGS/CPPFLAGS from configure, then it's convenient to define
the rule as:

SUFFIXES += .i .ii

.c.i:
        $(COMPILE) -E $< > $@

.cpp.ii:
        $(CXXCOMPILE) -E $< > $@

since $(COMPILE) and $(CXXCOMPILE) are generated in Makefile.in.
I use these frequently when debugging, and usually add these rules to new
projects' Makefile.am's.

HTH,


Fang