For cross-platform support, make the command separator (for executing multiple commands on the same line) configurable.
If you're using MinGW on a Windows platform for example, the command separator is &:
NUMBERS = 1 2 3 4
CMDSEP = &
doit:
$(foreach number,$(NUMBERS),./a.out $(number) $(CMDSEP))
This executes the concatenated commands in one line:
./a.out 1 & ./a.out 2 & ./a.out 3 & ./a.out 4 &
As mentioned elsewhere, on a *nix platform use CMDSEP = ;.
THE major reason to use make IMHO is the -j flag. make -j5 will run 5 shell commands at once. This is good if you have 4 CPUs say, and a good test of any makefile.
Basically, you want make to see something like:
.PHONY: all
all: job1 job2 job3
.PHONY: job1
job1: ; ./a.out 1
.PHONY: job2
job2: ; ./a.out 2
.PHONY: job3
job3: ; ./a.out 3
This is -j friendly (a good sign). Can you spot the boiler-plate? We could write:
.PHONY: all job1 job2 job3
all: job1 job2 job3
job1 job2 job3: job%:
./a.out $*
for the same effect (yes, this is the same as the previous formulation as far as make is concerned, just a bit more compact).
A further bit of parameterisation so that you can specify a limit on the command-line (tedious as make does not have any good arithmetic macros, so I'll cheat here and use $(shell ...))
LAST := 1000
NUMBERS := $(shell seq 1 ${LAST})
JOBS := $(addprefix job,${NUMBERS})
.PHONY: all ${JOBS}
all: ${JOBS} ; echo "$@ success"
${JOBS}: job%: ; ./a.out $*
You run this with make -j5 LAST=550, with LAST defaulting to 1000.
The promblem with the for number in 1 2 3 4 ; do \ ...-solution is, that no variables can be assigned within the loop. $(eval VAR=...) can only be used, if the content of the assignment is known at the beginning of the target execution. If the assignment depends on the loop-variable, VAR will be empty.
To circumvent this issue, one can use the target functionality to model a loop. The following example takes the n-th file from SRC / OBJ and processes them together. Using this construction you can even use $(eval ...) to process the loop variable, as demonstrated with VAR3.
makefile
SRC = f1.c f2.cpp f3.cpp
OBJ = f1.o f2.o f3.o
SRC2 = $(addsuffix _,$(SRC))
JOIN = $(join $(SRC2),$(OBJ))
PHONY: all
all : info loop
loop : $(JOIN)
$(JOIN) :
@# LOOP - CONTENT
@echo "TARGET: $@"
$(eval VAR1=$(word 1,$(subst _, ,$@)))
@echo "VAR1: "$(VAR1)
$(eval VAR2=$(word 2,$(subst _, ,$@)))
@echo "VAR2: "$(VAR2)
$(eval VAR3=$(subst .o,.x,$(VAR2)))
@echo "You can even substitute you loop variable VAR3: "$(VAR3)
#g++ -o $(VAR2) $(VAR1)
@echo
PHONY: info
info:
@printf "\n"
@echo "JOIN: "$(JOIN)
@printf "\n"
output
$ make
JOIN: f1.c_f1.o f2.cpp_f2.o f3.cpp_f3.o
TARGET: f1.c_f1.o
VAR1: f1.c
VAR2: f1.o
You can even substitute you loop variable VAR3: f1.x
#g++ -o f1.o f1.c
TARGET: f2.cpp_f2.o
VAR1: f2.cpp
VAR2: f2.o
You can even substitute you loop variable VAR3: f2.x
#g++ -o f2.o f2.cpp
TARGET: f3.cpp_f3.o
VAR1: f3.cpp
VAR2: f3.o
You can even substitute you loop variable VAR3: f3.x
#g++ -o f3.o f3.cpp
This is not really a pure answer to the question, but an intelligent way to work around such problems:
instead of writing a complex file, simply delegate control to for instance a bash script like: makefile
foo : bar.cpp baz.h
bash script.sh
and script.sh looks like:
for number in 1 2 3 4
do
./a.out $number
done
Maybe you can use:
xxx:
for i in `seq 1 4`; do ./a.out $$i; done;
If you're using GNU make, you could try
NUMBERS = 1 2 3 4
doit:
$(foreach var,$(NUMBERS),./a.out $(var);)
which will generate and execute
./a.out 1; ./a.out 2; ./a.out 3; ./a.out 4;
You can use set -e as a prefix for the for-loop. Example:
all:
set -e; for a in 1 2 3; do /bin/false; echo $$a; done
make will exit immediately with an exit code <> 0.
Although the GNUmake table toolkit has a true while loop (whatever that means in GNUmake programming with its two or three phases of execution), if the thing which is needed is an iterative list, there is a simple solution with interval. For the fun of it, we convert the numbers to hex too:
include gmtt/gmtt.mk
# generate a list of 20 numbers, starting at 3 with an increment of 5
NUMBER_LIST := $(call interval,3,20,5)
# convert the numbers in hexadecimal (0x0 as first operand forces arithmetic result to hex) and strip '0x'
NUMBER_LIST_IN_HEX := $(foreach n,$(NUMBER_LIST),$(call lstrip,$(call add,0x0,$(n)),0x))
# finally create the filenames with a simple patsubst
FILE_LIST := $(patsubst %,./a%.out,$(NUMBER_LIST_IN_HEX))
$(info $(FILE_LIST))
Output:
./a3.out ./a8.out ./ad.out ./a12.out ./a17.out ./a1c.out ./a21.out ./a26.out ./a2b.out ./a30.out ./a35.out ./a3a.out ./a3f.out ./a44.out ./a49.out ./a4e.out ./a53.out ./a58.out ./a5d.out ./a62.out
I realize the question is several years old, but this post may still be of use to someone as it demonstrates an approach which differs from the above, and isn't reliant upon either shell operations nor a need for the developer to schpeel out a hardcoded string of numeric values.
the $(eval ....) builtin macro is your friend. Or can be at least.
define ITERATE
$(eval ITERATE_COUNT :=)\
$(if $(filter ${1},0),,\
$(call ITERATE_DO,${1},${2})\
)
endef
define ITERATE_DO
$(if $(word ${1}, ${ITERATE_COUNT}),,\
$(eval ITERATE_COUNT+=.)\
$(info ${2} $(words ${ITERATE_COUNT}))\
$(call ITERATE_DO,${1},${2})\
)
endef
default:
$(call ITERATE,5,somecmd)
$(call ITERATE,0,nocmd)
$(info $(call ITERATE,8,someothercmd)
That's a simplistic example. It won't scale pretty for large values -- it works, but as the ITERATE_COUNT string will increase by 2 characters (space and dot) for each iteration, as you get up into the thousands, it takes progressively longer to count the words. As written, it doesn't handle nested iteration (you'd need a separate iteration function and counter to do so). This is purely gnu make, no shell requirement (though obviously the OP was looking to run a program each time -- here, I'm merely displaying a message). The if within ITERATE is intended to catch the value 0, because $(word...) will error out otherwise.
Note that the growing string to serve as a counter is employed because the $(words...) builtin can provide an arabic count, but that make does not otherwise support math operations (You cannot assign 1+1 to something and get 2, unless you're invoking something from the shell to accomplish it for you, or using an equally convoluted macro operation). This works great for an INCREMENTAL counter, not so well for a DECREMENT one however.
I don't use this myself, but recently, I had need to write a recursive function to evaluate library dependencies across a multi-binary, multi-library build environment where you need to know to bring in OTHER libraries when you include some library which itself has other dependencies (some of which vary depending on build parameters), and I use an $(eval) and counter method similar to the above (in my case, the counter is used to ensure we don't somehow go into an endless loop, and also as a diagnostic to report how much iteration was necessary).
Something else worth nothing, though not significant to the OP's Q: $(eval...) provides a method to circumvent make's internal abhorrence to circular references, which is all good and fine to enforce when a variable is a macro type (intialized with =), versus an immediate assignment (initialized with :=). There are times you want to be able to use a variable within its own assignment, and $(eval...) will enable you to do that. The important thing to consider here is that at the time you run the eval, the variable gets resolved, and that part which is resolved is no longer treated as a macro. If you know what you're doing and you're trying to use a variable on the RHS of an assignment to itself, this is generally what you want to happen anyway.
SOMESTRING = foo
# will error. Comment out and re-run
SOMESTRING = pre-${SOMESTRING}
# works
$(eval SOMESTRING = pre${SOMESTRING}
default:
@echo ${SOMESTRING}
Happy make'ing.
This answer, just as that of @Vroomfondel aims to circumvent the loop problem in an elegant way.
My take is to let make generate the loop itself as an imported makefile like this:
include Loop.mk
Loop.mk:Loop.sh
Loop.sh > $@
The shell script can the be as advanced as you like but a minimal working example could be
#!/bin/bash
LoopTargets=""
NoTargest=5
for Target in `seq $NoTargest` ; do
File="target_${Target}.dat"
echo $File:data_script.sh
echo $'\t'./data_script.ss $Target
LoopTargets="$LoopTargets $File"
done
echo;echo;echo LoopTargets:=$LoopTargets
which generates the file
target_1.dat:data_script.sh
./data_script.ss 1
target_2.dat:data_script.sh
./data_script.ss 2
target_3.dat:data_script.sh
./data_script.ss 3
target_4.dat:data_script.sh
./data_script.ss 4
target_5.dat:data_script.sh
./data_script.ss 5
LoopTargets:= target_1.dat target_2.dat target_3.dat target_4.dat target_5.dat
And advantage there is that make can itself keep track of which files have been generated and which ones need to be (re)generated. As such, this also enables make to use the -j flag for parallelization.
#I have a bunch of files that follow the naming convention
#soxfile1 soxfile1.o soxfile1.sh soxfile1.ini soxfile1.txt soxfile1.err
#soxfile2 soxfile2.o soxfile2.sh soxfile2.ini soxfile2.txt soxfile2.err
#sox... .... ..... .... .... ....
#in the makefile, only select the soxfile1.. soxfile2... to install dir
#My GNU makefile solution follows:
tgt=/usr/local/bin/ #need to use sudo
tgt2=/backup/myapplication/ #regular backup
install:
for var in $$(ls -f sox* | grep -v '\.' ) ; \
do \
sudo cp -f $$var ${TGT} ; \
cp -f $$var ${TGT2} ; \
done
#The ls command selects all the soxfile* including the *.something
#The grep command rejects names with a dot in it, leaving
#My desired executable files in a list.
A simple, shell/platform-independent, pure macro solution is ...
# GNU make (`gmake`) compatible; ref: <https://www.gnu.org/software/make/manual>
define EOL
$()
endef
%sequence = $(if $(word ${1},${2}),$(wordlist 1,${1},${2}),$(call %sequence,${1},${2} $(words _ ${2})))
.PHONY: target
target:
$(foreach i,$(call %sequence,10),./a.out ${i}${EOL})
Source: Stackoverflow.com