CODEWITHSUNDEEP
variablesmakefilegnu-make
nincompoop_
nincompoop_

Reputation: 126

How to use foreach variable in some other make variable for every loop run in makefile?

Consider i have a target consisting of foreach loop in makefile 

# variables
CONFIG = 1 2 3
LOG_DIR=CONFIG_$(VAR)

# targets

run:
    running application

run_configs:
    $(foreach VAR, $(CONFIG), make run CONFIGRATION=$(VAR) logging ; )

build_dir:
    mkdir $(LOG_DIR)/

logging: build_dir
    cp logdata/* $(LOG_DIR)/.

On running the foreach target

make run_configs

running application with CONFIG=1
making logdata
cp logdata/* CONFIG_/.

The directory expected was CONFIG_1 but built was CONFIG_

I understand the makefile is parsed first so, the variable LOG_DIR is evaluated as CONFIG_ because the foreach variable VAR is null at the time.

I cant find a way to update the LOG_DIR variable every time foreach loop is executed.

Is there a way to achieve this.

Upvotes: 0

Views: 120

Answers (1)

MadScientist
MadScientist

Reputation: 100856

Um...? When you invoke the recursive make you're setting the variable CONFIGRATION:

make run CONFIGRATION=$(VAR)

but when you construct the variable you're using $(VAR):

LOG_DIR=CONFIG_$(VAR)

CONFIGRATION is not the same as VAR. You need to either pass VAR to the submake:

make run VAR=$(VAR)

or use CONFIGRATION when building the variable:

LOG_DIR=CONFIG_$(CONFIGRATION)

Upvotes: 1

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