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C++ object file does not recompile when changes are made to a header file

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I have a utility header file that has a bunch of inline functions. When I make a change the the body of the function and save it and remake it will recompile, but the new changes will not have taken effect, although my dependent files are listed in my Makefile.

I have tried compiling it as an object file, as a precompiled header. Many similar suggestions have said that the dependency structure is wrong, but as long as I have included it in the dependencies list for my target, and the header file has been touched more recently than the target has been generated it should recompile, correct?

run_tracker: $(objects) run_tracker.o utils.h
 g++ -o $@ run_tracker.o $(objects) $(LIBS)

Say utils.h include a function like so:
void doSomething()cout << "Doing Something" << endl;

I have my run_tracker call the function, and then compile it like normal. It prints out "Do Something", I change that line to "Don't Do Something", make again,it does a shorter recompile, and then when I run it again, it prints the same thing as it did previously with no change.

c++ makefile g++

share|improve this question

edited Mar 28 at 18:47

πάντα ῥεῖ

1

asked Mar 28 at 18:41

lebraunlebraun

611 bronze badge

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  This is the linker step. Whats your compilation rule for run_tracker.o?
  
  – tkausl
  Mar 28 at 18:44
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have this for that: %.o: %.h
  
  – lebraun
  Mar 28 at 18:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Then you need to add utils.h as depencency. And remove it from the linker rule, the linker doesn't depend on any header file.
  
  – tkausl
  Mar 28 at 18:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I see. Is there an easy way to incorporate that into the %.o: %.h structure?
  
  – lebraun
  Mar 28 at 18:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  %.o: %.h utils.h.
  
  – tkausl
  Mar 28 at 18:57
  

  
  
  
  

 | 
show 6 more comments

0

I have a utility header file that has a bunch of inline functions. When I make a change the the body of the function and save it and remake it will recompile, but the new changes will not have taken effect, although my dependent files are listed in my Makefile.

I have tried compiling it as an object file, as a precompiled header. Many similar suggestions have said that the dependency structure is wrong, but as long as I have included it in the dependencies list for my target, and the header file has been touched more recently than the target has been generated it should recompile, correct?

run_tracker: $(objects) run_tracker.o utils.h
 g++ -o $@ run_tracker.o $(objects) $(LIBS)

Say utils.h include a function like so:
void doSomething()cout << "Doing Something" << endl;

I have my run_tracker call the function, and then compile it like normal. It prints out "Do Something", I change that line to "Don't Do Something", make again,it does a shorter recompile, and then when I run it again, it prints the same thing as it did previously with no change.

c++ makefile g++

share|improve this question

edited Mar 28 at 18:47

πάντα ῥεῖ

1

asked Mar 28 at 18:41

lebraunlebraun

611 bronze badge

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  This is the linker step. Whats your compilation rule for run_tracker.o?
  
  – tkausl
  Mar 28 at 18:44
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have this for that: %.o: %.h
  
  – lebraun
  Mar 28 at 18:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Then you need to add utils.h as depencency. And remove it from the linker rule, the linker doesn't depend on any header file.
  
  – tkausl
  Mar 28 at 18:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I see. Is there an easy way to incorporate that into the %.o: %.h structure?
  
  – lebraun
  Mar 28 at 18:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  %.o: %.h utils.h.
  
  – tkausl
  Mar 28 at 18:57
  

  
  
  
  

 | 
show 6 more comments

I have a utility header file that has a bunch of inline functions. When I make a change the the body of the function and save it and remake it will recompile, but the new changes will not have taken effect, although my dependent files are listed in my Makefile.

I have tried compiling it as an object file, as a precompiled header. Many similar suggestions have said that the dependency structure is wrong, but as long as I have included it in the dependencies list for my target, and the header file has been touched more recently than the target has been generated it should recompile, correct?

run_tracker: $(objects) run_tracker.o utils.h
 g++ -o $@ run_tracker.o $(objects) $(LIBS)

Say utils.h include a function like so:
void doSomething()cout << "Doing Something" << endl;

I have my run_tracker call the function, and then compile it like normal. It prints out "Do Something", I change that line to "Don't Do Something", make again,it does a shorter recompile, and then when I run it again, it prints the same thing as it did previously with no change.

c++ makefile g++

share|improve this question

edited Mar 28 at 18:47

πάντα ῥεῖ

1

asked Mar 28 at 18:41

lebraunlebraun

611 bronze badge

run_tracker: $(objects) run_tracker.o utils.h
 g++ -o $@ run_tracker.o $(objects) $(LIBS)

share|improve this question

edited Mar 28 at 18:47

πάντα ῥεῖ

1

asked Mar 28 at 18:41

lebraunlebraun

611 bronze badge

share|improve this question

edited Mar 28 at 18:47

πάντα ῥεῖ

1

asked Mar 28 at 18:41

lebraunlebraun

611 bronze badge

edited Mar 28 at 18:47

πάντα ῥεῖ

1

edited Mar 28 at 18:47

πάντα ῥεῖ

1

asked Mar 28 at 18:41

lebraunlebraun

611 bronze badge

asked Mar 28 at 18:41

lebraunlebraun

611 bronze badge