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


How can I have a Makefile automatically rebuild source files that include a modified header file? (In C/C++)Why can templates only be implemented in the header file?Why does C++ need a separate header file?Combining C++ and C - how does #ifdef __cplusplus work?C++11 introduced a standardized memory model. What does it mean? And how is it going to affect C++ programming?How do I make Makefile to recompile only changed files?Why does changing 0.1f to 0 slow down performance by 10x?How to recompile when modified c++ header?Recompiling certain targets upon changing of dependancy using autotoolsHow to make Makefile recompile when a header file is changed?






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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.










share|improve this question





















  • 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

















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.










share|improve this question





















  • 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













0












0








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.










share|improve this question
















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















share|improve this question













share|improve this question




share|improve this question








edited Mar 28 at 18:47









πάντα ῥεῖ

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1










asked Mar 28 at 18:41









lebraunlebraun

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  • 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












  • 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







1




1





This is the linker step. Whats your compilation rule for run_tracker.o?

– tkausl
Mar 28 at 18:44






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






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





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





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





%.o: %.h utils.h.

– tkausl
Mar 28 at 18:57












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