Makefile to compile multiple C programs?
This is an incredibly simple question, but I'm new to makefiles. I am trying to make a makefile that will compile two independent programs:
program1:
gcc -o prog1 program1.c
program2:
gcc -o prog2 program2.c
All the examples online go into way more details than I need and are confusing! All I really want it to do is to run the two gcc
lines. What am I doing wrong?
Do it like so
all: program1 program2
program1: program1.c
gcc -o program1 program1.c
program2: program2.c
gcc -o program2 program2.c
You said you don't want advanced stuff, but you could also shorten it like this based on some default rules.
all: program1 program2
program1: program1.c
program2: program2.c
Pattern rules let you compile multiple c files which require the same compilation commands using make
as follows:
objects = program1 program2
all: $(objects)
$(objects): %: %.c
$(CC) $(CFLAGS) -o $@ $<
############################################################################
# 'A Generic Makefile for Building Multiple main() Targets in $PWD'
# Author: Robert A. Nader (2012)
# Email: naderra at some g
# Web: xiberix
############################################################################
# The purpose of this makefile is to compile to executable all C source
# files in CWD, where each .c file has a main() function, and each object
# links with a common LDFLAG.
#
# This makefile should suffice for simple projects that require building
# similar executable targets. For example, if your CWD build requires
# exclusively this pattern:
#
# cc -c $(CFLAGS) main_01.c
# cc main_01.o $(LDFLAGS) -o main_01
#
# cc -c $(CFLAGS) main_2..c
# cc main_02.o $(LDFLAGS) -o main_02
#
# etc, ... a common case when compiling the programs of some chapter,
# then you may be interested in using this makefile.
#
# What YOU do:
#
# Set PRG_SUFFIX_FLAG below to either 0 or 1 to enable or disable
# the generation of a .exe suffix on executables
#
# Set CFLAGS and LDFLAGS according to your needs.
#
# What this makefile does automagically:
#
# Sets SRC to a list of *.c files in PWD using wildcard.
# Sets PRGS BINS and OBJS using pattern substitution.
# Compiles each individual .c to .o object file.
# Links each individual .o to its corresponding executable.
#
###########################################################################
#
PRG_SUFFIX_FLAG := 0
#
LDFLAGS :=
CFLAGS_INC :=
CFLAGS := -g -Wall $(CFLAGS_INC)
#
## ==================- NOTHING TO CHANGE BELOW THIS LINE ===================
##
SRCS := $(wildcard *.c)
PRGS := $(patsubst %.c,%,$(SRCS))
PRG_SUFFIX=.exe
BINS := $(patsubst %,%$(PRG_SUFFIX),$(PRGS))
## OBJS are automagically compiled by make.
OBJS := $(patsubst %,%.o,$(PRGS))
##
all : $(BINS)
##
## For clarity sake we make use of:
.SECONDEXPANSION:
OBJ = $(patsubst %$(PRG_SUFFIX),%.o,$@)
ifeq ($(PRG_SUFFIX_FLAG),0)
BIN = $(patsubst %$(PRG_SUFFIX),%,$@)
else
BIN = $@
endif
## Compile the executables
%$(PRG_SUFFIX) : $(OBJS)
$(CC) $(OBJ) $(LDFLAGS) -o $(BIN)
##
## $(OBJS) should be automagically removed right after linking.
##
veryclean:
ifeq ($(PRG_SUFFIX_FLAG),0)
$(RM) $(PRGS)
else
$(RM) $(BINS)
endif
##
rebuild: veryclean all
##
## eof Generic_Multi_Main_PWD.makefile
all: program1 program2
program1:
gcc -Wall -o prog1 program1.c
program2:
gcc -Wall -o prog2 program2.c