Jian Tang's C/C++ E-Log

• Practice Codes
• Writing makefile in Linux

How to write "makefile" in Linux:

A Guide could be found HERE in Chinese.

1. Wildcards: "*","?","[...]" can be used in commands(rm *.o), value of variables(OBJ= *.o, different from OBJ:=$(wildcard *.o), which will expand the value)
2. Searching files:
   • a special variable "VPATH" provides searching directories for make, paths are seperated by ":"
   • another way is to use "vpath" key word: vpath
3. Pseudo Object: clean(put ".PHONY : clean" first)
4. Multiple Objects: useage of "$@"
5. Static Pattern:[targets ...] : [target-pattern] : [prereq-pattern]

   Example:

   OBJ = foo.o bar.o

   $(OBJ):%.o : %.c

   $(CC) -c $(CFLAGS) %< -o %@

6. Automatic Generation of Dependence:generate a "file_name.d" for each "file_name.cc"