Conditionally add parameters to CXXFLAGS

[N Galpin]

Hi

I'd like to define multiple build targets in my makefile, and depending
on which target I pass to make, add different flags to $(CXXFLAGS).

For example, if i run `make release` I'd like this target to append
-O3 onto CXXFLAGS, or if I run `make debug`, I'd like to append
-g etc.

I've spent some time searching through the man pages and the
archives, but I haven't found anything.

This is the makefile I've built. (No it's not a school assignment
despite what it looks like. It's actually a toy program I'm writing
to experiment with some things I'm not familiar with.)

CXXFLAGS = -Wall -pedantic-errors -ansi
CXX = g++
OBJS = unittest.o csudokupoint.o csudokupuzzle.o

RELEASE = SudokuSolver
DEBUG = SudokuSolverD
AUTOTEST = SudokuSolverUnitTest

RELEASE_DIR = ../release
DEBUG_DIR = ../debug
AUTOTEST_DIR = ../test

release: $(RELEASE)
debug: $(DEBUG)
autotest: $(AUTOTEST)


clean:
        rm -f $(RELEASE_DIR)/*
        rm -f $(DEBUG_DIR)/*
        rm -f $(AUTOTEST_DIR)/*

clean-release:
        rm -f $(RELEASE_DIR)/* 

clean-debug:
        rm -f $(DEBUG_DIR)/* 

clean-autotest:
        rm -f $(AUTOTEST_DIR)/*


$(RELEASE): $(OBJS)
        $(CXX) $(OBJS) -o $(RELEASE)
        mv $(OBJS) $(RELEASE) $(RELEASE_DIR)

$(DEBUG): $(OBJS)
        $(CXX) $(OBJS) -o $(DEBUG)
        mv $(OBJS) $(DEBUG) $(DEBUG_DIR)

$(AUTOTEST): $(OBJS)
        $(CXX) $(OBJS) -o $(AUTOTEST)
        mv $(OBJS) $(AUTOTEST) $(AUTOTEST_DIR)


unittest.o: unittest.cpp csudokupoint.cpp csudokupoint.h
csudokupoint.o: csudokupoint.cpp csudokupoint.h
csudokupuzzle.o: csudokupuzzle.cpp csudokupuzzle.h csudokupoint.cpp 
csudokupoint.h


.PHONY:  release debug test clean clean-release clean-debug clean-autotest

Thanks,

Nathanael
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