Fon's question got me thinking. While /opt/local/bin precedes /usr/
bin in my $PATH, when I `which gcc` I get /usr/bin/gcc. Huh? Since
I've never had insurmountable compiler glitches, I'd lost track of how
I'd worked around previous issues. I have created a mess! In /usr/
bin/ I've got two executables, gcc-4.0 and gcc-4.2 (renamed mp files,
if I recall correctly) and two links:
gcc -> /usr/bin/gcc-4.0 and
gcc-4.3 -> /opt/local/bin/gcc-mp-4.3
In /opt/local/bin, I've got gcc-mp-4.3 and gcc-mp-4.4 (and the gccbug
executables).
I would like to be able to type gcc and fire up the latest C compiler
(gcc-mp-4.4?), which is not as problem; however, I don't want to try
to compile older code that might (?) not be compatible with gcc-mp 4.4.
What is the "clean", correct way to manage my C compiler(s)?
Thanks.
Tim
On Jun 10, 2009, at 5:14 PM, Michael Crawford wrote:
On Wed, Jun 10, 2009 at 4:06 PM, Fon Vitale<[email protected]>
wrote:
Coming back whit the C compiler example, if Macports installs the
compiler
when I run it what compiler is being running: Macports installed or
prior
Macports one?
That depends on the value of your PATH environment variable. Give the
following command in the Terminal:
echo $PATH
You'll see a list of directories. If /opt/local comes before
/usr/bin, then the MacPorts version will be run; otherwise the
previously installed one will be run.
You can also do:
which gcc
... and it will give you the pathname of the gcc that will actually be
run if you simply give the "gcc" command. Which does its work by
examining each of the directories in your PATH.
If you're not hip to PATH and other environment variables, try the
following Google search:
UNIX shell tutorial
There's lots of good ones, and if you're going to be working with the
command line on Mac OS X, you would do well to read one or two.
Mike
\
--
Michael David Crawford
mdcrawford at gmail dot com
GoingWare's Bag of Programming Tricks
http://www.goingware.com/tips/
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