Using g++ on OSX Lion, ld: unknown option: -no_compact_unwind

Question

I followed the instructions at https://sites.google.com/site/dwhipp/tutorials/mac_compilers for OSX Lion and XCode 4.3 to use g++ on the command line, but when I run it I get this:

jeff~/Dropbox/cpp$ g++ hello.cpp 
ld: unknown option: -no_compact_unwind
collect2: error: ld returned 1 exit status

Answer 1

If you want to use the latest version of GCC (4.7) by command line on Mac OS X Lion, I have a better solution.

Install MacPorts (you can download the source code and compile it or download the pkg installer):

http://www.macports.org/install.php

Installed MacPort, open the Terminal and type (you need the root password)

sudo port selfupdate

for updating the port tree. Then type

sudo port install gcc47 +universal

This command will install the GCC 4.7 compiler on your Mac (this compilation will take a lot of time, be patient). Now you have your GCC 4.7 compiler accessible by the command line under the name

gcc-mp-4.7

(use g++-mp-4.7for C++ compilation). You have also the new C++11 standard adding the option

g++-mp-4.7 -std=c++11