[vorbis-dev] ogg.m4 and vorbis.m4

[volsung at asu.edu]

On Mon, 20 Aug 2001, Jeff Squyres wrote:

> Ah -- I was wondering where NONE came from.  Here's what I get (BTW, 2.52
> is the most recent version of autoconf):
> 
> $prefix			2.13		2.52
> ---------------------	-------------	----------------
> <nothing>		NONE		NONE
> --prefix=foo		foo		foo
> 
> $ogg_prefix		2.13		2.52
> ---------------------	-------------	----------------
> <nothing>		""		""
> --with-ogg-prefix=foo	foo		foo
> --without-ogg-prefix	no		no
> 
> I'm not sure where the whole "x$foo" = "x" thing came from (perhaps
> someone put the quotes in later), but there's no harm in adding another
> character, so I left it in my original e-mail.  So if we understand where
> the NONE stuff came from, we can reduce the test to:
> 
>  	if test "$ogg_prefix" != "" -a "$ogg_prefix" != "no"; then
> 	  ...
> 	elif test "$prefix" != "" -a "$prefix" != "NONE"; then
> 	  ...
> 	fi
> 
> Howzat?

Looks good.  This is exactly the information I was looking for.

The "x" stuff is to avoid problems where the shell does not interpret the
empty string as another argument.  Without it, you might feed test fewer
arguments than you intend, like:

test !=
test != NONE
etc.

Do we need to test $prefix for being empty if "NONE" is really the case we are
going for?  I think the stuff about "NONE" vs. "" was just confusion about
$prefix vs. $ogg_prefix.


---
Stan Seibert

--- >8 ----
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