Is this a bug?

[Patrick Uiterwijk]

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Hi,

On Fri, Jan 16, 2015 at 08:12:15PM -0700, Ashoordin wrote:
> Hello friends,
> I am new with Fedora 21 but I am trying to learn C++ as well. So, in my
> compilation command of

First of all, this might be the wrong list for this, as this list if for Fedora Infrastructure stuff.

> "g++ -Wall `root-config --cflags --ldflags --libs` example.cpp" I am
> receiving the error message
> "/usr/lib/gcc/i686-redhat-linux/4.9.2/../../../crt1.o: In function `_start':
> (.text+0x18): undefined reference to `main'
> collect2: error: ld returned 1 exit status"

This means you forgot to define a function called main in example.cpp: https://wwwx.cs.unc.edu/~sparkst/howto/cpp_main.php

> After changing the compilation command to
> "g++ -ansi -Wall -I /usr/include -c example.cpp"
> I no longer receive the error.
> However during linking command
> "g++ -L /usr/lib/../../../ crt1.o *.o -lgsl -lgslcblas -lm"
> I receive the following error message
> "g++: error: crt1.o: No such file or directory"
> But, I know for sure that there is such a file. So, what could be wrong?

Note you have a space between /usr/lib/../../../ and crt1.o, so it's searching for crt1.o in the current directory.

> 
> Thanks for everyone's help,
> Ashur

- -- 
With kind regards,
Patrick Uiterwijk
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