Xcode Failed to Install G++

Shoal · Shoal #1 (**permalink**)

03-08-2012, 07:58 PM

Hi all.

Just days ago I installed Xcode from the App Store, but then when I went to the terminal prompt I discovered that the g++ command wasn't there. What gives? Everyone tells me it's supposed to be there, and I need it...

Any help would be greatly appreciated. Thanks!

vansmith · vansmith #2 (**permalink**)

03-08-2012, 08:16 PM

It should be there but you wouldn't be the first person missing the links. Execute the following commands to set the links:

Code:

sudo ln -s /Developer/usr/bin/llvm-g++-4.2 /usr/bin/g++

Code:

sudo ln -s /Developer/usr/bin/llvm-gcc-4.2 /usr/bin/gcc

Shoal · Shoal #3 (**permalink**)

03-08-2012, 08:20 PM

It says "udo" command not found.

vansmith · vansmith #4 (**permalink**)

03-08-2012, 08:22 PM

Oops, that was my inability to copy and paste.

Commands fixed.

Shoal · Shoal #5 (**permalink**)

03-08-2012, 08:37 PM

The line to enter g++ didn't seem to work. It gave me a very grave warning that I was probably about the screw up my machine and then asked me for my password. I entered it, pressed enter, and was unceremoniously returned to the prompt with no sign of success or failure. Entering in the line again says, "Line exists." But here's the thing: it still tells me no g++ command exists.

vansmith · vansmith #6 (**permalink**)

03-08-2012, 08:41 PM

When it completes, you don't get a warning or success message. In fact, having nothing printed back is a good sign.

What does the following return?

Code:

echo $PATH

Shoal · Shoal #7 (**permalink**)

03-08-2012, 08:43 PM

It returns:

Code:

/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin

vansmith · vansmith #8 (**permalink**)

03-08-2012, 09:21 PM

Well, /usr/bin is in your PATH (as it should be) and there is a symlink there called "g++" to the g++ binary installed by Xcode. Do you at least have success executing llvm-g++-4.2 from /Developer/usr/bin/?

Shoal · Shoal #9 (**permalink**)

03-09-2012, 05:33 AM

Is "llvm-g++-4.2" a command that needs to be run from a specific directory? (You're dealing with a guy who has lots of DOS experience but virtually zero Unix command line experience. I have to look up how to change directories...)

vansmith · vansmith #10 (**permalink**)

03-09-2012, 10:23 AM

cd = change directory.

You can simply execute /Developer/usr/bin/llvm-g++-4.2 or "cd" into /Developer/usr/bin and then type "./llvm-g++-4.2" (without the quotes).

Shoal · Shoal #11 (**permalink**)

03-09-2012, 06:03 PM

It says "no such file or directory" when I enter "/Developer/usr/bin/llvm-g++-4.2".

Would it make any difference to say I have Xcode 4.3?

vansmith · vansmith #12 (**permalink**)

03-09-2012, 07:21 PM

Yes, absolutely. Xcode 4.3 doesn't install the tools by default. Go to Xcode > Preferences > Downloads > Components > install "Command Line Tools."

Shoal · Shoal #13 (**permalink**)

03-10-2012, 08:20 PM

Works just fine now, thanks a lot for all your help!

vansmith #2 (permalink)
Member Since: Oct 19, 2008 Location: Ottawa Posts: 15,281 Mac Specs: 2012 13" MBP (2.5 i5, 8GB)	03-08-2012, 08:16 PM It should be there but you wouldn't be the first person missing the links. Execute the following commands to set the links: Code: sudo ln -s /Developer/usr/bin/llvm-g++-4.2 /usr/bin/g++ Code: sudo ln -s /Developer/usr/bin/llvm-gcc-4.2 /usr/bin/gcc Important Links: Community Guidelines : Use the reputation system if you've been helped. M-F Blog :: Write for the blog :: M-F IRC Channel - Chats every Sunday at 8PM EST. Last edited by vansmith; 03-08-2012 at 08:22 PM.
	QUOTE Thanks

vansmith #4 (permalink)
Member Since: Oct 19, 2008 Location: Ottawa Posts: 15,281 Mac Specs: 2012 13" MBP (2.5 i5, 8GB)	03-08-2012, 08:22 PM Oops, that was my inability to copy and paste. Commands fixed. Important Links: Community Guidelines : Use the reputation system if you've been helped. M-F Blog :: Write for the blog :: M-F IRC Channel - Chats every Sunday at 8PM EST.
	QUOTE Thanks

vansmith #6 (permalink)
Member Since: Oct 19, 2008 Location: Ottawa Posts: 15,281 Mac Specs: 2012 13" MBP (2.5 i5, 8GB)	03-08-2012, 08:41 PM When it completes, you don't get a warning or success message. In fact, having nothing printed back is a good sign. What does the following return? Code: echo $PATH Important Links: Community Guidelines : Use the reputation system if you've been helped. M-F Blog :: Write for the blog :: M-F IRC Channel - Chats every Sunday at 8PM EST.
	QUOTE Thanks

Shoal #7 (permalink)
Member Since: Jan 19, 2012 Posts: 14	03-08-2012, 08:43 PM It returns: Code: /usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin
	QUOTE Thanks

vansmith #8 (permalink)
Member Since: Oct 19, 2008 Location: Ottawa Posts: 15,281 Mac Specs: 2012 13" MBP (2.5 i5, 8GB)	03-08-2012, 09:21 PM Well, /usr/bin is in your PATH (as it should be) and there is a symlink there called "g++" to the g++ binary installed by Xcode. Do you at least have success executing llvm-g++-4.2 from /Developer/usr/bin/? Important Links: Community Guidelines : Use the reputation system if you've been helped. M-F Blog :: Write for the blog :: M-F IRC Channel - Chats every Sunday at 8PM EST.
	QUOTE Thanks

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Shoal #1 (permalink)
Member Since: Jan 19, 2012 Posts: 14	03-08-2012, 07:58 PM Hi all. Just days ago I installed Xcode from the App Store, but then when I went to the terminal prompt I discovered that the g++ command wasn't there. What gives? Everyone tells me it's supposed to be there, and I need it... Any help would be greatly appreciated. Thanks!
	QUOTE Thanks

Shoal #5 (permalink)
Member Since: Jan 19, 2012 Posts: 14	03-08-2012, 08:37 PM The line to enter g++ didn't seem to work. It gave me a very grave warning that I was probably about the screw up my machine and then asked me for my password. I entered it, pressed enter, and was unceremoniously returned to the prompt with no sign of success or failure. Entering in the line again says, "Line exists." But here's the thing: it still tells me no g++ command exists.
	QUOTE Thanks

Shoal #9 (permalink)
Member Since: Jan 19, 2012 Posts: 14	03-09-2012, 05:33 AM Is "llvm-g++-4.2" a command that needs to be run from a specific directory? (You're dealing with a guy who has lots of DOS experience but virtually zero Unix command line experience. I have to look up how to change directories...)
	QUOTE Thanks

vansmith #10 (permalink)
Member Since: Oct 19, 2008 Location: Ottawa Posts: 15,281 Mac Specs: 2012 13" MBP (2.5 i5, 8GB)	03-09-2012, 10:23 AM cd = change directory. You can simply execute /Developer/usr/bin/llvm-g++-4.2 or "cd" into /Developer/usr/bin and then type "./llvm-g++-4.2" (without the quotes). Important Links: Community Guidelines : Use the reputation system if you've been helped. M-F Blog :: Write for the blog :: M-F IRC Channel - Chats every Sunday at 8PM EST.
	QUOTE Thanks

Shoal #11 (permalink)
Member Since: Jan 19, 2012 Posts: 14	03-09-2012, 06:03 PM It says "no such file or directory" when I enter "/Developer/usr/bin/llvm-g++-4.2". Would it make any difference to say I have Xcode 4.3?
	QUOTE Thanks

vansmith #12 (permalink)
Member Since: Oct 19, 2008 Location: Ottawa Posts: 15,281 Mac Specs: 2012 13" MBP (2.5 i5, 8GB)	03-09-2012, 07:21 PM Yes, absolutely. Xcode 4.3 doesn't install the tools by default. Go to Xcode > Preferences > Downloads > Components > install "Command Line Tools." Important Links: Community Guidelines : Use the reputation system if you've been helped. M-F Blog :: Write for the blog :: M-F IRC Channel - Chats every Sunday at 8PM EST.
	QUOTE Thanks

Shoal #13 (permalink)
Member Since: Jan 19, 2012 Posts: 14	03-10-2012, 08:20 PM Works just fine now, thanks a lot for all your help!
	QUOTE Thanks

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