CODEWITHSUNDEEP
objectmakefile
jorgen
jorgen

Reputation: 3593

Makefile: compiling several objects with single target

I have several c++ objects that I'd like to compile using a single target. If possible I'll make a variable in the makefile that list all the object files and then have a single target that compiles them all.

Following this question I have the following "Makefile" so far:

#### Directories and flags

ifndef $(DIR_MAIN)
  DIR_MAIN=../..
endif

DIR_EXE=$(DIR_MAIN)
DIR_SRC=$(DIR_MAIN)/src/Analyse_MC
DIR_MISC_SRC=$(DIR_MAIN)/src/Misc
DIR_BLD=$(DIR_MAIN)/build/Analyse_MC
DIR_MISC_BLD=$(DIR_MAIN)/build/Misc
COMP=g++

COMPILE_FLAGS= -std=c++11 -O3 -lstdc++ `pkg-config --cflags eigen3` -msse2 -I${DIR_MISC_SRC}
LINK_FLAGS= -O3 -fopenmp -lgsl -lgslcblas -lm -lhdf5_cpp -lhdf5

OBSERVABLE_OBJECTS=g_decomp_IP_orthog_sphere.o g_decomp_LS_orthog_sphere.o g_decomp_IP_disk.o g_decomp_LS_disk.o find_rank.o eigenvectors.o GramSchmidt.o diagonal_Hamiltonian.o mean_log_WF.o energy.o JK_EP_overlap.o overlap.o geo_mean_eigstate_overlap.o eigstate_overlap.o pair_corr_bins.o


#### Compile all

all: setup observables $(DIR_EXE)/Analyse_MC

setup:
    @mkdir -p $(DIR_BLD)

#### Compile observable objects

observables: $(addsuffix -stamp,$(OBSERVABLE_OBJECTS))

%.-stamp : %.o
    ${COMP} -c -o $@ $<

However when running make I get the following:

make: *** No rule to make target `g_decomp_IP_orthog_sphere.o-stamp', needed by `observables'.  Stop.

So I've misunderstood something.

If possible I'd also like each of the objects to be updated with changes in .h-files with the name of the object in addition to some common .h-files for all of the objects. Is this possible?

Or do I have to / is it recommended to write a separate target for each object?

EDIT:

Some info about the variables:

DIR_MAIN is defined the way it is because usually this makefile will be called from another makefile which defines DIR_MAIN from its directory using pwd; but ut can also be called on its own from its own directory.

DIR_MISC_SRC points to some header files necessary for the files in DIR_SRC.

DIR_BLD and DIR_MISC_BLD will contain the corresponding resulting object files.

Upvotes: 0

Views: 356

Answers (1)

Toby Speight
Toby Speight

Reputation: 30781

The error message does show you what you've done wrong, but a bit obliquely:

make: *** No rule to make target g_decomp_IP_orthog_sphere.o-stamp, needed by observables. Stop.

Your rule to make stamp files is:

%.-stamp: %.o

You probably wanted that to be

%.o-stamp: %.o

Compiling %.o to %.o-stamp looks very strange to begin with - probably you just want

observables: $(OBSERVABLE_OBJECTS)
.PHONY: observables

Stamp files are sometimes useful for actions you want to perform once but have no output file. For compilation, the object file is the output file, and that's all that make requires.

If possible I'd also like each of the objects to be updated with changes in .h-files with the name of the object in addition to some common .h-files for all of the objects. Is this possible?

That's a whole nother question in itself - you want to search for "makefile auto-dependency generation" for starting points.

Upvotes: 1

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