Help on Makefile

[Eljay Love-Jensen]

Hi Lalit Seth,

Your question is off-topic for this forum.

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For doing something like:
gmake debug
...and...
gmake release

Do something like this near the beginning of your makefile:
ifeq ($(MAKECMDGOALS),debug)
BUILD:=debug
endif
ifeq ($(MAKECMDGOALS),release)
BUILD:=release
endif
ifeq ($(findstring $(BUILD),debug release),)
$(error BUILD=$(BUILD) is unknown, must be BUILD=release or BUILD=debug)
endif

And this near the end:
.PHONY : debug release
debug: all
release: all

And you can use the $(BUILD) variable to determine what compiler settings 
you want, and what directory you want to put your build files.

As given, "make clean" will fail; but "make BUILD=debug clean" will 
succeed.  You could either put in a "BUILD:=debug" as the default (near the 
very top of the makefile), so "make" will always do a BUILD:=debug by default.

Or, you may want to add a "BUILD:=clean" option that cleans both debug and 
release interim generated files.

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However, I highly recommend that you DO NOT do that.  Instead, I recommend 
you do:
gmake BUILD=debug
...and...
gmake BUILD=release

Using "debug" and "release" as targets is counter-intuitive to the make 
paradigm.  In my opinion.

HTH,
--Eljay