Re: autoconf-2.49c, libtool-1.3.5 and Cygwin

[Earnie Boyd]

Akim Demaille wrote:
> 
> | I decided to give autoconf-2.49c a try on Cygwin.
> | In configuring the libtool package I
> |   cd libtool-1.3.5
> |   autoupdate
> |   autoconf
> |   cd libltdl
> |   autoupdate
> |   autoconf  ;# Reports error.
> |
> | The errors are:
> |
> | configure.in:109: error: AC_REQUIRE: cannot be used outside of an
> | m4_defun'd macro
> | configure.in:109: AC_CANONICAL_HOST is required by...
> | configure.in:109: the top level.
> 
> That's correct: there are indeed macros required from the top level.
> I don't want to dive into the details, but indeed before this used to
> work, somewhat luckily, but you no longer can with 2.50, and I think
> it is safer that you can't.  Typically, inside a macro, running this:
> 
> if foo; then
>   AC_REQUIRE([foo])
> fi
> 
> is safe, but not at the top level, this is why I did not struggle to
> restore the old behavior.  But really, making this work at the top
> level is special casing: I have not prohibited it for free.
> 

Ok, it's the reason I cross posted to libtool.

> | I also execute the autoheader in the libltdl directory and get an error:
> |
> | autoheader: running /usr/local/bin/autoconf -l . to trace from
> | configure.in
> | autoheader: sourcing /tmp/ah309/traces.sh
> | autoheader: error: shell error while sourcing /tmp/ah309/trace.sh
> |
> | The script creates traces.sh and executes trace.sh.
> 
> Well, trace.sh contains this:
> 
> /* Define if you have the \`dlerror' function. */
> #undef HAVE_DLERROR"
> configure.in:109: error: AC_REQUIRE: cannot be used outside of an m4_defun'd 
> mac
> ro
> configure.in:109: AC_CANONICAL_HOST is required by...
> configure.in:109: the top level
> 
> I'll try to see if there are means to improve the diagnostic.

Uh, I was saying autoheader creates traces.sh and sources trace.sh. 
Note plural vs singular.  I would have expected the same problems from
configure.in and indeed traces.sh does have the errors from configure.in
as you say.

Earnie.

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