Problems with g++ flags

[eger <eger at isr dot ist dot utl dot pt>]

    Hello, we are trying to compile a C++ program that we found in the
net (about intersection of polygons). It cames with a Makefile
containing this statement:

CFLAGS   =  -D_G_UNIX \
 -fexceptions \
 -fguiding-decls \
 -fno-implicit-templates \
 -static\
 -DHAVE_CONFIG_H\
 -fpermissive \
 -D_REENTRANT -g

and when we try to compile it, we obtain that  -fexceptions,
-fguiding-decls and -f permissive are unknown options.
Is there some place where we can find all (and we mean all) the options
and flags for C and C++ on g++ ?

Thanks in advance for your help.

                                Egidio & Elvino


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