Makefile中的标志未出现

Question

I have a makefile, but it seems like the cflags are only working for certain files in my program, and I am not sure why.

Here is what happens when I use make:

$ make
gcc -Wall -ansi -pedantic -g -c main.c
gcc  -c fw.c
gcc  -c trie.c
gcc -Wall -ansi -pedantic -g -c linked.c
gcc -Wall -ansi -pedantic -g -o fw main.o fw.o trie.o linked.o

You can see that when trying to make fw.c and trie.c it doesn't include the flags, but it does include the flags for the other files.

Here is my makefile:

 CC = gcc
 CFLAGS = -Wall -ansi -pedantic -g
 MAIN = main
 OBJS = main.o fw.o trie.o linked.o
 all : $(MAIN)

 $(MAIN) : $(OBJS) fw.h trie.h linked.h
     $(CC) $(CFLAGS) -o fw $(OBJS)

 main.o : main.c fw.h trie.h linked.h
     $(CC) $(CFLAGS) -c main.c

 fw.o : fw.c fw.h trie.h
     $(CC) $(CGLAGS) -c fw.c

 trie.o : trie.c fw.h trie.h linked.h
     $(CC) $(CGLAGS) -c trie.c

 linked.o : linked.c trie.h linked.h
     $(CC) $(CFLAGS) -c linked.c

 rm :
     rm *.o $(MAIN) core

I also have an additional problem in that whenever I use make with unchanged files from the last make, it still executes this line:

$ make
gcc -Wall -ansi -pedantic -g -o fw main.o fw.o trie.o linked.o

Whereas usually, it gives me the message "nothing to be done for all". I have tried to compare this makefile to my other working makefiles, but I can't find the error(s). Where have I gone wrong?

Answer 1

You have typos in your Makefile :

 fw.o : fw.c fw.h trie.h
     $(CC) $(CGLAGS) -c fw.c

 trie.o : trie.c fw.h trie.h linked.h
     $(CC) $(CGLAGS) -c trie.c

Note the G . Instead, use this:

 fw.o : fw.c fw.h trie.h
     $(CC) $(CFLAGS) -c fw.c

 trie.o : trie.c fw.h trie.h linked.h
     $(CC) $(CFLAGS) -c trie.c