Re: gcc makefile hello world (linking iostream)

[Jonathan Wakely <jwakely dot gcc at gmail dot com>]

On 25 June 2012 15:23, blessman11 wrote:
>
>
>
> Jonathan Wakely-4 wrote:
>>
>> On 21 June 2012 16:14, blessman11 wrote:
>>>
>>> hi
>>>
>>> I'm trying to code hello world in GCC, but whilst I get my simple
>>> makefile
>>> correctly, the problem comes when I try to use <iostream> or even my own
>>> headerfiles defined outside the folder with my main .cpp file.
>>>
>>> so any help?
>>
>> I already answered this question, read my entire reply:
>>
>> http://gcc.gnu.org/ml/libstdc++/2012-06/msg00068.html
>>
>>
>
> I thought I had been posting in this thread instead, my bad. But why is it
> throwing up errors like that, how can I make my code stop linking with "gcc"
> instead of "g++". What else do I have to do beyond what I did?
>
> [output]all: hello
> ? ? ? ?-std=c++11
>
> ?objects = hello.o
>
> ?edit: $(objects)
> ? ? ? ?g++ -o edit $(objects)
> ?[/output]

You haven't defined a rule for building "hello" so it uses the
implicit rule to link "hello.o" into hello, which is:

$(CC) $(LDFLAGS) hello.o $(LOADLIBES) $(LDLIBS) -o hello

CC is the C compiler, not the C++ compiler, so it doesn't link the C++
runtime libraries.

Your makefile has a rule to build "edit" but you seem to want a target
called "hello" -- why is your rule building "edit" instead?  It will
work if you just change "edit" to "hello" or vice versa.

Also, your rule for "all" is invalid, "-std=c++0x" is not a valid
rule, I don't know what you meant that to be.