CODEWITHSUNDEEP
c++makefile
Invictus
Invictus

Reputation: 4328

Makefile behaviour related to sequence of rules to be defined

I have written a makefile in which the sequence of commands is as follows inside my makefile

    .PHONY: all clean distclean run
    run : $(program_NAME)
    ./$(program_NAME) > output.txt  #runs my program and stotre output in output.txt

    all: $(program_NAME)

    $(program_NAME): $(program_OBJS)
    $(LINK.cc) $(program_OBJS) -o $(program_NAME)

If i change the sequence of this to below one it doesnot work for me:-

   .PHONY: all clean distclean run
   $(program_NAME): $(program_OBJS)
   $(LINK.cc) $(program_OBJS) -o $(program_NAME)

   all: $(program_NAME)

    run : $(program_NAME)
    ./$(program_NAME) > output.txt  #runs my program and stotre output in output.txt

This doesnot generate any output.txt for me . What i feel is run : is dependent on $(program_NAME) so $(program_NAME): $(program_OBJS) $(LINK.cc) $(program_OBJS) -o $(program_NAME)s should come before run : in makefile. But its working fine other way round . Can Someone throw some light here? (Thanks)

Upvotes: 0

Views: 64

Answers (1)

Diego Sevilla
Diego Sevilla

Reputation: 29021

First of all, you have to observe indentation rules for makefiles. Commands to be executed by a rule should start with a tab character. Then, take into account that the first rule that appears in the makefile is executed automatically when you type make. In the first case the program is run. To obtain the same in the second makefile in which the run rule is not the first, you have to execute make run.

Upvotes: 1

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