How do I make a simple makefile for gcc on Linux

Question

I have three files  program c  program h and headers h   program c includes program h and headers h   I need to compile this on Linux using gcc compiler   I m not sure how to do this  Netbeans created one for me  but it s empty

User · Answer

Depending on the number of headers and your development habits  you may want to investigate gccmakedep  This program examines your current directory and adds to the end of the makefile the header dependencies for each  c cpp file  This is overkill when you have 2 headers and one program file  However  if you have 5  little test programs and you are editing one of 10 headers  you can then trust make to rebuild exactly those programs which were changed by your modifications

User · Answer

For example this simple Makefile should be sufficient    CC gcc  CFLAGS -Wall  all  program program  program o program o  program c program h headers h  clean      rm -f program program o run  program       program   Note there must be  lt tab gt  on the next line after clean and run  not spaces   UPDATE Comments below applied

User · Answer

Interesting  I didn t know make would default to using the C compiler given rules regarding source files   Anyway  a simple solution that demonstrates simple Makefile concepts would be   HEADERS   program h headers h  default  program  program o  program c   HEADERS      gcc -c program c -o program o  program  program o     gcc program o -o program  clean      -rm -f program o     -rm -f program    bear in mind that make requires tab instead of space indentation  so be sure to fix that when copying   However  to support more C files  you d have to make new rules for each of them   Thus  to improve   HEADERS   program h headers h OBJECTS   program o  default  program    o    c   HEADERS      gcc -c   lt  -o     program    OBJECTS      gcc   OBJECTS  -o     clean      -rm -f   OBJECTS      -rm -f program   I tried to make this as simple as possible by omitting variables like   CC  and   CFLAGS  that are usually seen in makefiles   If you re interested in figuring that out  I hope I ve given you a good start on that   Here s the Makefile I like to use for C source   Feel free to use it   TARGET   prog LIBS   -lm CC   gcc CFLAGS   -g -Wall   PHONY  default all clean  default    TARGET  all  default  OBJECTS     patsubst   c    o    wildcard   c   HEADERS     wildcard   h     o    c   HEADERS        CC    CFLAGS  -c   lt  -o      PRECIOUS    TARGET    OBJECTS     TARGET     OBJECTS        CC    OBJECTS  -Wall   LIBS  -o     clean      -rm -f   o     -rm -f   TARGET    It uses the wildcard and patsubst features of the make utility to automatically include  c and  h files in the current directory  meaning when you add new code files to your directory  you won t have to update the Makefile   However  if you want to change the name of the generated executable  libraries  or compiler flags  you can just modify the variables   In either case  don t use autoconf  please   I m begging you

User · Answer

The simplest make file can be   all   test  test   test o         gcc -o test test o   test o   test c         gcc -c test c  clean           rm test   o

User · Answer

all  program program o  program h headers h   is enough  the rest is implicit

[c] How do I make a simple makefile for gcc on Linux?

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