CODEWITHSUNDEEP
c++linuxubuntug++
Edward83
Edward83

Reputation: 6686

Ubuntu compilers (C++)

I am new for Linux programming (Ubuntu server).

What difference between instructions:

c++ -c  main.cpp -o main.o -lstdc++
c++ -c  Console.cpp -o Console.o -lstdc++
c++ main.o Console.o -o App1

and this:

g++ -c  main.cpp -o main.o -lstdc++
g++ -c  Console.cpp -o Console.o -lstdc++
g++ main.o Console.o -o App1

Are these instructions the same? Is c++ instruction provides another name for g++?

Upvotes: 2

Views: 1661

Answers (8)

Alexander
Alexander

Reputation: 10396

Yes.

Here's how to figure out these types of things

To find the path to an executable:

which c++

To check if it's a file or a symbolic link:

ls -ald `which c++`

To check what type of file it is:

file `which c++`

To get a checksum that can be used to compare it to other files:

md5sum `which c++`

Here's one way of checking if c++ and g++ are equal:

[ `md5sum $(which c++) | cut -d' ' -f1` == `md5sum $(which g++) | cut -d' ' -f1` ] && echo Yes, equal content || echo No, unequal content

Upvotes: 1

CashCow
CashCow

Reputation: 31445

g++ means the GNU C++ compiler.

c++ means a non-specific C++ compiler but it has to be linked to a specific one. If in your case, this is just a symbolic link to the GNU C++ compiler then there is no difference. However you could make the symbolic link point to a different C++ compiler.

Upvotes: 1

Olaf Dietsche
Olaf Dietsche

Reputation: 74098

Just look for yourself:

$ ls -l /usr/bin/c++ /usr/bin/g++ /etc/alternatives/c++

lrwxrwxrwx 1 root root 12 Jun 2 19:41 /etc/alternatives/c++ -> /usr/bin/g++*
lrwxrwxrwx 1 root root 21 Jun 2 19:41 /usr/bin/c++ -> /etc/alternatives/c++*
lrwxrwxrwx 1 root root 7 Mär 13 2012 /usr/bin/g++ -> g++-4.6*

or do:

$ c++ -v

vs.

$ g++ -v

Upvotes: 1

muehlbau
muehlbau

Reputation: 1917

Yes, default is g++. You can check it using update-alternatives --display c++; change it via sudo update-alternatives c++

update-alternatives --config c++
There are 2 choices for the alternative c++ (providing /usr/bin/c++).

  Selection    Path              Priority   Status
------------------------------------------------------------
* 0            /usr/bin/g++       20        auto mode
  1            /usr/bin/clang++   10        manual mode
  2            /usr/bin/g++       20        manual mode

Upvotes: 3

juanchopanza
juanchopanza

Reputation: 227578

They are probably the same. You can check explicitly:

which c++

/usr/bin/c++

ls -l /usr/bin/c++

/etc/alternatives/c++

ls -l etc/alternatives/c++

/usr/bin/g++

Upvotes: 2

Gerhard Burger
Gerhard Burger

Reputation: 1439

Yes they are the same, typing

which c++

gives you that c++ is in fact /usr/bin/c++. then typing 

ll /usr/bin/c++

will give you

lrwxrwxrwx 1 root root 21 Sep  4 17:00 /usr/bin/c++ -> /etc/alternatives/c++*

then

ll /etc/alternatives/c++

will give you

lrwxrwxrwx 1 root root 12 Sep  4 17:00 /etc/alternatives/c++ -> /usr/bin/g++*

so yes, they are the same (there is a symbolic link from c++ to g++).

Upvotes: 1

dragonroot
dragonroot

Reputation: 5851

update-alternatives --display c++

Upvotes: 4

Don Johnson
Don Johnson

Reputation: 93

They both use the GNU C++ compiler I believe. So yes, they are the same.

Upvotes: 2

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