CODEWITHSUNDEEP
compilationmakefile
ben
ben

Reputation: 472

make/makefile: realize that there is a new (not changed) source file

In general my makefile works. Since people will ask, here it is for reference:

HEADERS = *.h
OBJS =  *.o
MYFORWARDS = *.c
WARNS = -Wall
CC = gcc
CFLAGS = -mwindows -Wall 
LDFLAGS = -mwindows -lkernel32 -luser32
all : my.exe
my.exe : ${OBJS}
    ${CC} -o "$@" ${OBJS} ${LDFLAGS}
%.o : %.c ${HEADERS}
    ${CC} ${CFLAGS} -c $< -o $@

I like the *.o and *.c so i dont have to edit the makefile each time a .c is added.

Make generally works backwards: For each target look if one of its sources changed, if so rebuild.

I dont want to change that since it's the whole point of make, however there's an exception.

The problem is, that when i create a new .c file then there exists no .o file yet and thus (make working backwards from the .o's) it does not even realize that there is a new .c.

What i have done up to now is each time i create a new .c i manually create the new .o file.

Is there a better way? Thanks in advance.

Upvotes: 3

Views: 60

Answers (1)

Josh Kelley
Josh Kelley

Reputation: 58352

A common approach is to list out your object files, instead of relying on wildcards.

OBJS = main.o util.o something_else.o

In GNU Make, you can also use functions, as described in the manual, to make a list of .o based on .c:

OBJS := $(patsubst %.c,%.o,$(wildcard *.c))

Upvotes: 3

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