Re: [PATCH v5 for-5.0] configure: warn if not using a separate build directory

[Eric Blake <eblake@redhat.com>]

On 4/6/20 10:33 AM, Daniel P. Berrangé wrote:
> Running configure directly from the source directory is a build
> configuration that will go away in future. It is also not currently
> covered by any automated testing. Display a deprecation warning if

Calling it a deprecation warning may be overkill now that we've toned 
down the language.

> the user attempts to use an in-srcdir build setup, so that they are
> aware that they're building QEMU in an undesirable manner.
> 
> Reviewed-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
> 

> +if test "$in_srcdir" = "yes"; then
> +    echo
> +    echo "NOTE: we recommend against building in the source directory"
> +    echo
> +    echo "You've run the 'configure' script directly from the source"
> +    echo "directory. This will work, but we recommend using a separate"
> +    echo "build directory, especially if you plan to work with the QEMU"
> +    echo "sources rather than just building it once. You can switch to"
> +    echo "a separate build directory like this:"
> +    echo
> +    echo "  $ mkdir build"

As I pointed out on v4, this is missing a step.  Since this is just a 
warning and not fatal, './configure' completed and polluted the in-tree 
directories to the point that following these instructions will fail 
unless they start with 'make distclean' prior to the other steps.

> +    echo "  $ cd build"
> +    echo "  $ ../configure"
> +    echo "  $ make"
> +    echo
> +fi
> +
>   config_host_mak="config-host.mak"
>   
>   echo "# Automatically generated by configure - do not modify" >config-all-disas.mak
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org