How to compile with different CFLAGS.

[Andrea Riciputi]

Hi,
I hope you can help me to improve my understanding of make, that it's 
very poor indeed. Here is my make file, mostly stolen from the one on 
the Paul's site.

> CCompiler = gcc
>
> CFLAGS = -O2 -Wno-long-double -I/sw/include
> DEBUGCFLAGS = -g -Wno-long-double -I/sw/include
>
> LDFLAGS = -L/sw/lib -lgsl -lgslcblas -lm
>
> SourceFiles = CArrays.c Grid1d.c my_func.c my_base.c my_type.c 
> my_analitic.c
> ObjectFiles = $(patsubst %.c,%.o,$(SourceFiles))
>
> ifeq (,$(filter zzz%,$(notdir $(CURDIR))))
>  include target.mk
> else
>  #----- End Boilerplate
>
> VPATH = $(SRCDIR)
>
> .PHONY: C
>
> C: NewGal.exe
>
> NewGal.exe: $(ObjectFiles)
>         $(CCompiler) $(CFLAGS) $(LDFLAGS) $^ -o $@
>
> %.o: %.c
>         $(CCompiler) $(CFLAGS) -c $^ -o $@
>
> .PHONY: debug
>
> debug: NewGal_gdb.exe
>
> NewGal_gdb.exe: $(ObjectFiles)
>        $(CCompiler) $(DEBUGCFLAGS) $(LDFLAGS) $^ -o $@
>
> %.o: %.c
>        $(CCompiler) $(DEBUGCFLAGS) -c $^ -o $@

My intention is to compile my source files with different flags 
depending on which PHONY target I give as make's argument. But, 
obviously, it doesn't work. Any suggestion?

More generally, how can I get done different actions associeted with 
the same rule (I mean same prerequisites and same target)?

Thanks in advance,
Andrea.

---
Andrea Riciputi

"Science is like sex: sometimes something useful comes out,
  but that is not the reason we are doing it" -- (Richard Feynman)