executables in gcc4.0.2

["sean yang" <seanatpurdue at hotmail dot com>]

If we do a search of main function in gcc4..0.2/gcc directory, we can find 
several.
I understand collect2.c-->collect2, main.c (wrapper of toplev.c) -->cc1, 
gcov.c-->gcov. Can someone give a brief introduction what gen*() is ued for? 
For example, genattr is compiled to destgcc/gcc/build/genattr, but I don't 
see anything else calls this executable.

Thanks,
Sean

----------------------------------------------------
gcc> grep "main (int " *.c
collect2.c:main (int argc, char **argv)
fix-header.c:main (int argc, char **argv)
gcc.c:main (int argc, const char **argv)
gcov.c:main (int argc, char **argv)
gcov-dump.c:main (int argc ATTRIBUTE_UNUSED, char **argv)
gcov-iov.c:main (int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
genattr.c:main (int argc, char **argv)
genattrtab.c:main (int argc, char **argv)
gencheck.c:main (int argc, char ** ARG_UNUSED (argv))
gencodes.c:main (int argc, char **argv)
genconditions.c:main (int argc, char **argv)
genconfig.c:main (int argc, char **argv)
genconstants.c:main (int argc, char **argv)
genemit.c:main (int argc, char **argv)
genextract.c:main (int argc, char **argv)
genflags.c:main (int argc, char **argv)
gengenrtl.c:main (int argc, char **argv)
gengtype.c:extern int main (int argc, char **argv);
genmddeps.c:main (int argc, char **argv)
genopinit.c:main (int argc, char **argv)
genoutput.c:main (int argc, char **argv)
genpeep.c:main (int argc, char **argv)
genpreds.c:main (int argc, char **argv)
gen-protos.c:main (int argc ATTRIBUTE_UNUSED, char **argv)
genrecog.c:main (int argc, char **argv)
main.c:int main (int argc, char **argv);
main.c:main (int argc, char **argv)
mips-tdump.c:main (int argc, char **argv)
mips-tfile.c:main (int argc, char **argv)
protoize.c:main (int argc, char **const argv)

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