Re: Broken example in autoconf manual

[Nick Bowler]

Hello,

On 2017-03-16, Max Horn <address@hidden> wrote:
> on
> https://www.gnu.org/software/autoconf/manual/autoconf.html#Using-System-Type
>
> this example is given:
>
>      case $host in
>        alpha*-*-*)   AC_CONFIG_LINKS([dither.c:alpha/dither.c]) ;;
>        powerpc*-*-*) AC_CONFIG_LINKS([dither.c:powerpc/dither.c]) ;;
>        *-*-*)        AC_CONFIG_LINKS([dither.c:generic/dither.c]) ;;
>      esac
>
> But that doesn't actually work; inserting it into configure.ac leads to this
> error:
>
> configure.ac:396: error: `dither.c' is already registered with
> AC_CONFIG_LINKS.

Nice catch.

[...]
> Which leaves me wondering how to achieve equivalent behavior correctly?

Probably the example could be written something like this (untested):

   case $host in
     alpha*-*-*)   dither_src=alpha ;;
     powerpc*-*-*) dither_src=powerpc ;;
     *-*-*)        dither_src=generic ;;
   esac
   AC_CONFIG_LINKS([dither.c:$dither_src/dither.c]) ;;

Cheers,
  Nick