2010-03-12 07:48:17 makefile

Filip Vanalme (BELGIUM)

Message: 87136

My knowledge about makefiles is rather limited. I would like to do something like this in the Kernel's main makefile to make a 'special' version of the Kernel (e.g. a stripped variant) :

test:

@echo "**** building special Kernel ****"

# Saving current config files and replace them by the special one's

cp linux-2.6.x/.config linux-2.6.x/.savedconfig

cp linux-2.6.x/.specialconfig linux-2.6.x/.config

cp config/.config config/.savedconfig

cp config/.specialconfig config/.config

export TESTING

$(MAKE) TESTING=1

# restore the original configs

cp config/.savedconfig config/.config

cp linux-2.6.x/.savedconfig linux-2.6.x/.config

I looks like this is working when I do make test (I see the copying of files, then the starting of the 'normal' make ...), but I finally get compilation errors.

When I do the first copy part (i.e. the first 4 cp's) manually from the command prompt and let the makefile start with the 'export' line, It works well (no compilation errors).

test:

@echo "**** building special Kernel ****"

# .config files manually replace from command prompt before calling make

export TESTING

$(MAKE) TESTING=1

# restore the original configs

cp config/.savedconfig config/.config

cp linux-2.6.x/.savedconfig linux-2.6.x/.config

Can I replace any .config files within the makefile or is this already too late (i.e. the make has already interpreted the .config files before it reaches the replace part) ?

There are probably better ways to do this kind of things, no ?

Filip

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2010-03-12 08:17:21 Re: makefile

Mike Frysinger (UNITED STATES)

Message: 87137

since you use $(MAKE), it should a re-processing of the Makefile, but it's probably using the existing environment as a base instead of a fresh one

you could try creating a GNUmakefile that looks like:

all %:

$(MAKE) -f Makefile $@

test:

... your current test target ...