Re: How do I make a portable test??

[Eric Siegerman]

On Fri, Feb 14, 2003 at 06:41:04PM +0000, Dr. David Kirkby wrote:
> Eric Siegerman wrote:
> AC_HAVE_HEADERS(gsl/gsl_sf_ellint.h,[gsl_inc_count=$(($gsl_inc_count +
> 1))])

Right; "$((expr))" -- "arithmetic expansion" it's called in
ksh(1) -- is another nonstandard extension.

The Bourne-shell way to say x=x+1 is:
        x=`expr $x + 1`
or to be paranoid, as someone else pointed out:
        x=`expr "0$x" + 1`
But of course that breaks if $x is negative...

--

|  | /\
|-_|/  >   Eric Siegerman, Toronto, Ont.        address@hidden
|  |  /
A distributed system is one on which I cannot get any work done,
because a machine I have never heard of has crashed.
        - Leslie Lamport