Re: Compiling code on different machine?

James Kanze <>
Sat, 7 Mar 2009 02:09:52 -0800 (PST)
On Mar 6, 1:30 pm, Jeff Schwab <> wrote:

mlt wrote:

Is there someway in C++ to read a machines ID of somekind?

I have some code that should be compiled in a certain way
when it is compiled on a laptop and in another way when its
compiled on a desktop.

Currently I do:

#define DESKTOP 1

in main() {
        // do desktop compilation
        // do laptop compilation

I could be nice if there was some system variable that I
could test for that would identify the correct machine.

There's no portable mechanism (AFAIK) guaranteed by the C or
C++ standards, but try gethostbyname(3).

He spoke of compiling, not run time. My makefiles regularly do
this, using $(shell uname -n) to get the host name. This still
doesn't give me any information about the type, however;
basically, I need a different configuration file for every host
I support. On Unix, this is easily handled by means of symbolic
links, but under Windows, I don't know. (And of course, this
supposes standardizing on a common make for all platforms. The
expression I gave above is for GNU make; other makes will likely
have a different syntax, if they support it at all.)

James Kanze (GABI Software)
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