Re: incomplete warning message

[Eric Blake]

On 05/31/2010 03:15 PM, Bruno Haible wrote:
> Hi,
>
> Here's a case of an incomplete invocation stack trace in an autoconf warning:
>
>    $ autoconf
>    configure.ac:63: warning: gl_LIBUNISTRING_LIBSOURCE was called before 
> gl_LIBUNISTRING
>    m4/libunistring-base.m4:21: gl_LIBUNISTRING_LIBSOURCE is expanded from...
>    m4/gnulib-comp.m4:148: gl_INIT is expanded from...
>    configure.ac:63: the top level
>    configure.ac:63: warning: gl_LIBUNISTRING_LIBHEADER was called before 
> gl_LIBUNISTRING
>    m4/libunistring-base.m4:53: gl_LIBUNISTRING_LIBHEADER is expanded from...
>
> The last line looks like the stack trace would include at least one more line.
> But it ends abruptly.

I'm wondering if somehow the mere act of printing the backtrace is 
deleting the stacktrace.  I think this one should be easy enough to 
track down before 2.68, so I'm reviving it on my list of hot TODO items 
this week.

> How to reproduce:
>    $ wget http://www.haible.de/bruno/gnu/autoconf-bug-20100531.tar.gz
>    $ tar xvfz autoconf-bug-20100531.tar.gz
>    $ cd autoconf-bug-20100531
>    $ autoconf

I saw it as well last week when cleaning up some gnulib 
AC_COMPILE_IFELSE usage patterns.

--
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org