Using vpath and wild card in Makefile

Question

1) I am having directory called dir, and the subdirectories are sub1, sub2, sub3.

2) I want to create a Makefile which will compile all the sources in the subdirectory. These are some lines of my makefile.

CFLAGS = -I/usr/include/ -I./ -ansi -g
GPROF_CFLAGS = -I/usr/include/ -I./
VPATH = ./sub1 ./sub2 ./sub3
SRCS := $(wildcard *.c)
OBJS=$(SRCS:.c=.o)
exe:    $(OBJS)
        $(CC) $(LFLAG) -o exe $(CFLAGS) $(OBJS) -lm 

exe_gprof:
        gcc $(LFLAG) -o exe $(GPROF_SUFFIX) $(GPROF_CFLAGS) $(SRCS)

clean:
        rm -f *.o

clean_all: clean
        rm -f exe exe$(GPROF_SUFFIX) gmon.out Simfir000.stat rm -f *.o.

3) This make file works fine, if i have only sub folder called sub(this directory contains all source files) and no other sub folder. (i.e) in the make file vpath=./sub.

4) If there are sub folders as I mentioned in point 1, the main file is in the subfolder of sub1/src/main.c(i.e sub folder inside the sub folder). If I try to compile. It's giving undefined ref to main.

5) what change I have to do, to compile this successfully. Can we give more than one directory path in vpath?.

Overall map is:

Having directory called dir

sub directory dir/sub1

dir/sub2

dir/sub3

main file is in dir/sub1/src/main.c

My second question is
If I want to execute directory by directory and create different exe's

compiling sub1 only and create sub1exe

copiling sub2 only and create sub2exe.

The make file will be

CFLAGS = -I/usr/include/ -I./ -ansi -g
GPROF_CFLAGS = -I/usr/include/ -I./
VPATH = ./sub1 ./sub2 ./sub3
SRCS1 := $(wildcard *.c)
SRCS2 := $(wildcard *.c)
OBJS=$(SRCS:.c=.o)
exe1:    $(OBJS)
        $(CC) $(LFLAG) -o exe1 $(CFLAGS) $(OBJS) -lm 
exe2:    $(OBJS)
        $(CC) $(LFLAG) -o exe2 $(CFLAGS) $(OBJS) -lm 

exe1_gprof:
        gcc $(LFLAG) -o exe1 $(GPROF_SUFFIX) $(GPROF_CFLAGS) $(SRCS1)
exe2_gprof:
        gcc $(LFLAG) -o exe2 $(GPROF_SUFFIX) $(GPROF_CFLAGS) $(SRCS2)

clean:
        rm -f *.o

clean_all: clean

What changes I have to make instead of $(wildcard *.c).

You want to build `exe1` and `exe2` from the same objects? – Beta Sep 04 '13 at 15:04 — Beta, Sep 04 '13 at 15:04

score 1 · Answer 1 · edited May 23 '17 at 12:16

1

This post seems to answer your question: Sources from subdirectories in Makefile

Try SRCS = $(wildcard *.c) $(wildcard **/*.c)

I think VPATH and wildcard are not working together, so that your SRCS doesn't have all source files.

By the way, have you already tried CMake?

edited May 23 '17 at 12:16

Community

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1

answered Sep 04 '13 at 08:15

yegorich

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No i don't know CMake. I have used, but i don't know to create it by own. – user2732944 Sep 04 '13 at 08:48
If i make SRCS = $(wildcard .c) $(wildcard */*.c), it's compiling, but,if header files which includes in the file of one sub directory,which is not refrencing to other subdirectory. – user2732944 Sep 04 '13 at 09:22
Which means dir/sub1/file1.c(In this file #include"header.h"), this file is present in the dir/sub3/header.h. I have change dir/sub1/file1.c(In this file #include"../sub3/header.h"). It's not working. – user2732944 Sep 04 '13 at 09:27
That's strange. It must work. Could you place all your header files in the central include folder (dir/include)? Add -Iinclude at the beginning of your CFLAGS . – yegorich Sep 04 '13 at 10:48

Using vpath and wild card in Makefile

1 Answers1