Re: passing command-line switches to compiler

[Lars J. Aas]

On Mon, Feb 28, 2000 at 09:44:56PM +0100, Lars J. Aas wrote:
: I agree with the example above, but I don't know how to get rid of my
: changequotes unless there are any alternate methods to make strings with
: m4-invocations inside a couple of []s?  What I'm thinking of specifically
: in my case is that I configure the text inside "[default=...]" in some
: AC_HELP_STRINGs.  I'd happily remove the changequote stuff if I knew how.
: Using "(default=...)" breaks with the rest of the options listed with
: "configure --help".

I found a solution to my own problem, which only requires an additional m4
macro:

define([m4_noquote],[changequote(,)$1changequote([,])])

Then I can do this:

AC_DEFUN([SIM_AC_CHECK_COIN], [
dnl | This is really set based on the args in SIM_AC_CHECK_COIN invocation
dnl | from configure.in, but just to illustrate...
define([my_m4_coinpathdef],[/usr/local])

AC_ARG_WITH([coin],
  AC_HELP_STRING([--with-coin=DIR],
                 m4_noquote([set path to coin [default=my_m4_coinpathdef]])),
  [],
  [with_coin=my_m4_coinpathdef])

configure --help will then display:

  --with-coin=DIR         set path to coin [default=/usr/local]

Any chance my little "m4_noquote"-macro will make it into autoconf?

  Lars J