Platform-specific AC_ARG_*

[John Calcote]

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I'm building a configure.ac file that would like to provide some
platform-specific options as command-line options.

For example, on Solaris SPARC hosts, you can target sparc-generic code,
if you wish, but it makes no sense to even see an option,
- --enable-sparc-generic on an Intel Linux box.

Is there a way to use AC_ENABLE_ARG conditionally, based on the contents
of the $host variable, for example?

I've also thought about the possibility of adding some "solaris only"
text to the help text for the option. I've also considered adding an
AC_MSG_ERROR message if someone attempts to use the option on a
non-Solaris/Sparc host. But these options seem wrong to me.

Thanks,
John
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