General use of makefile. These are demos to help with make commands.

Makefiles are traditionally named either "makefile" or "Makefile". We can re-use makefile/ modify it to our needs. However, makefiles are very particular about whitespace. It prefers TABS as separators. It gives self - explanatory error such as:

*** missing separator (did you mean TAB instead of 8 spaces?).  Stop.

RUNNING MAKE

To run the make command, make sure your working directory has a makefile in it. If it is not one of the standard names described above you can use the -f option to the make command. If the makefile is named MAKEFILE, you would type

make -f MAKEFILE // Use name "MAKEFILE"

grep 
find . -name 'Makefile' // to use that name instead. 

There are many other things to know about running make. If you do not want make to do anything but just want to see what make might do, use the -n option, which does not execute any commands but just displays which ones it would do:

make -n

NOTES:

Touch will create an empty file without modification in compiling Or if it already has a file it will update

touch dummyfile // will also create it

rm dummyfile

rm *.o // will delete all .o files

make main.o // will only create make.o else make command will compile the first object demo

clean:

make clean // will delete object files

.PHONY: clean // will not create clean file but runs .Tells make that it is a fake target

\rm *.o

    ^
    |

Give an unaliased version of the file

install: demo

\cp demo ../bin   -> will create a copy of demo and name it install and puts it in dir /bin
touch install

install2: demo

if [ ! -d ../bin ] ; then mkdir ../bin ; fi //if bin does not exist create a dir /bin
\cp demo ../bin
touch install2

tar: *.c *.h

if [ ! -d demodir ] ; then mkdir demodir ; fi
    ln -f Makefile *.c *.h demodir/
    tar -czf demo.tar.gz demodir
    rm -rf demodir

ln - > create links, -czf -> compress the files in the directory, rm -> removes the demodir

Makefile will create variables or use them if already present...

all: $(EXEC)

Lastly, the makefile in this top-level directory is the LAST part of this tutorial. You will not understand it until you have finished the tutorial. Save it for last :)