Re: AC_ARG_WITH

[Russell Shaw]

Stepan Kasal wrote:
> Hello,
>
> On Fri, Oct 22, 2004 at 04:20:18AM +1000, Russell Shaw wrote:
>
> >  /configure --with-default-size=5.8
>
>
> I still think --enable-default-size=5.8 is best suited for your needs.
> But it's only cosmetic change.
>
>
> > Maybe a new macro should be made for setting numerical defaults rather
> > than aimed at package defaults.
>
>
> I don't think it's worth it.  Your case seems to be quite unusual.
> I'd guess that you could make the parameter configurable at runtime, in a
> config file.
>
> Perhaps like this:
> 1) get it from user config file
> 2) get it from system config file, installed with the package
> 3) get the hardwired default
>
> If the package would install a default config file, you'd almost never
> get to 3), so there is no need to make it settable by ./configure.
>
> Yours,
>         Stepan Kasal

Hi,
I did it like this in configure.ac:

AC_ARG_WITH(
    [border],
    AC_HELP_STRING([--with-border],
                   [set default border size for negative plots (mm)]),
    [[border=$withval]],
    [[border=3]]
)
if test "$withval" = "yes" -o "$withval" = "no" ; then
    AC_MSG_ERROR([Invalid value for excellon format: $withval],1)
fi
AC_DEFINE_UNQUOTED([GERBTOEPS_DEFAULT_BORDER],[$border],[Default border size])

(i'm still not sure if double quotes [[...]] are the right thing or not)


In main.c, i read the environment variable, then if unused, i use the
default border from config.h.