Makefile C++11 errors on Ubuntu Linux

Question

I have written an application in the IDE CLion. I am trying to create a Makefile on a Linux machine. I used a template Makefile to create my own Makefile, however, there are issues. Note that there are 3 classes called quote, trade and signal.

CXX = g++
# mandatory build flags
CXXFLAGS = -O2 -Werror -std=c++11

# mandatory link flags
AM_LDFLAGS = -Wl,-as-neeeded

output: main.o quote.o trade.o signal.o
    ${CXX} ${AM_LDFLAGS} ${LDFLAGS} $(filter %.o,$^) -o $@

%: %.cpp
    ${CXX} ${AM_CXXFLAGS} ${CXXFLAGS} $< -c -o $@

quote.o: quote.cpp quote.h
trade.o: trade.cpp trade.h
signal.o: signal.cpp signal.h

When I run the Makefile, I get the errors:

error: #error This file required the -std=c++11 or -std=gnu++11 compiler options.

Then, many errors appear which require C++11 support. For example, there are issues with std::string, std::chrono. How do I fix this? I am requesting that someone fix the code. Since I just started learning MakeFile today, I most likely won't understand your technical suggestion. Please help. Very appreciative!

EDIT: After following the suggestions below, I fixed the above error. I am now getting the following errors:

g++ -02 -Werror -std=c++11 -c -o main.o main.cpp

g++ -02 -Werror -std=c++11 -c -o quote.o quote.cpp

g++ -02 -Werror -std=c++11 -c -o trade.o trade.cpp

g++ -Wl, -as-needed main.o quote.o trade.o signal.o -o output

/usr/bin/ld: unrecognixed -a option 's-needed'

collect2: error: ld returned 1 exit status

@DanMašek Could you explicitly write exactly how this is done? — Ryan J. Shrott
– Ryan J. Shrott, Commented Mar 22, 2016 at 1:57
something like CXXFLAGS = -O2 -Werror -std=c++11 instead of the existing line you have there. — Dan Mašek
– Dan Mašek, Commented Mar 22, 2016 at 2:00
Show us the full output from running make not just the error message. — Etan Reisner
– Etan Reisner, Commented Mar 22, 2016 at 2:20
That's an entirely different error then the one you said you were getting. Do you still get the other error? Or did you fix that and just not report the new error? — Etan Reisner
– Etan Reisner, Commented Mar 22, 2016 at 2:44

Sam Varshavchik · Accepted Answer · 2016-03-22 01:57:57Z

2

AM_CXXFLAGS is used by automake. You are not using automake, so this accomplishes nothing.

Put all your compiler flags into CXXFLAGS only.

answered Mar 22, 2016 at 1:57

Sam Varshavchik

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3 Comments

Sam Varshavchik Over a year ago

Works for me just fine.

Ryan J. Shrott Over a year ago

thanks! I still receive other messages. Could you please see my edits above?

Sam Varshavchik Over a year ago

You made a typo in the option's name. Reread ld's manual page, and fix your typo.

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