how to add -std=c++11 to make file

Question

I want to add -std=c++11 to my makefile but I do not Where to add, here is my code:

hw07: test.o functions.o
    g++ test.o functions.o -o hw07
test.o: test.cpp headerfile.h
    g++ -c test.cpp
functions.o: functions.cpp  headerfile.h
    g++ -c functions.cpp
clean:
    rm *.o hw07

in the above code where should I add the stdc++11 code, please help me out about...

Everywhere you build a source file into an object file would be a good start. — Some programmer dude, May 22 '19 at 10:22
Possible duplicate of [How do I enable C++11 in gcc?](https://stackoverflow.com/questions/16886591/how-do-i-enable-c11-in-gcc) — acraig5075, May 22 '19 at 10:27

score 5 · Answer 1 · answered May 22 '19 at 10:38

Instead of spelling out all of the rules and all of the commands, use variables and implicit rules to build your program:

CXXFLAGS = -std=c++11

hw07: test.o functions.o

test.o: test.cpp headerfile.h

functions.o: functions.cpp  headerfile.h

clean:
    rm *.o hw07

This will have make build the object files using $(CXXFLAGS) as the options to pass to the compiler. Then make will build the program hw07 using the files listed in its dependencies.

Other flags that are good to have when compiling the source files are -Wall and -Wextra. Those enable more warning messages from the compiler, that in almost all cases point out suspect things that could lead to problems.

thnks a lot dude it helped me out :) – Ashraf Yawar May 22 '19 at 10:51 — Ashraf Yawar, May 22 '19 at 10:51

score 0 · Accepted Answer · answered May 22 '19 at 10:33

You can just add -std=c++11 after each g++:

hw07: test.o functions.o
    g++ -std=c+++11 test.o functions.o -o hw07
test.o: test.cpp headerfile.h
    g++ -std=c+++11 -c test.cpp
functions.o: functions.cpp  headerfile.h
    g++ -std=c+++11 -c functions.cpp
clean:
    rm *.o hw07

Also you can use a variable:

CPP_FLAGS='-std=c++11'

hw07: test.o functions.o
    g++ ${CPP_FLAGS} test.o functions.o -o hw07
test.o: test.cpp headerfile.h
    g++ ${CPP_FLAGS} -c test.cpp
functions.o: functions.cpp  headerfile.h
    g++ ${CPP_FLAGS} -c functions.cpp
clean:
    rm *.o hw07

how to add -std=c++11 to make file

2 Answers2