Makefile：编译时没有链接问题

Question

Currently I'm trying to compile.c-files in subfolder(s) without linking and created a simple draft in Makefile. What I want to do is take.o files into bin/ directory without linking as I described before. However couldn't reach any output successfully.

There is sample Makefile:

IDIR = test/inc
ODIR = test/src
CC = gcc
CFLAGS = -std=c99 -I$(IDIR)

OBJDIR    =   bin

.PHONY: clean

$(OBJDIR):
    mkdir   $(OBJDIR)

$(OBJDIR)/%.o:  $(ODIR)/*.c
    $(CC)   $(CFLAGS)   -c  $<  -o  $@

clean:
    @rm -rf $(OBJDIR)

It would be great if you define what did I missed.

Answer 1

the make file needs to actually ask for all the object files to be created. Suggest:

IDIR := test/inc
SDIR := test/src/

CC := gcc
CFLAGS := -Wall -Wextra -Wconversion -pedantic -std=c99 -I$(IDIR)

OBJDIR    :=   bin/

SRCS := (wildcard:$(SDIR)*.c)
OBJS := ($(SRCS):.c=.o)

.PHONY: all clean

all: $(OBJDIR)  $(OBJS)


$(OBJDIR):
    mkdir   $(OBJDIR)

$(OBJDIR)%.o:  %.c
    $(CC)   $(CFLAGS)   -c  $<  -o  $@

clean:
    @rm -rf $(OBJDIR)

run the above makefile using:

make -f (your make file name) all