Re: [PATCH] configure: Avoid error messages about missing *-config-*.h files

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 5/19/21 12:57 PM, Thomas Huth wrote:
> When compiling with --disable-system there is a harmless yet still
> annoying error message at the end of the "configure" step:
> 
>  sed: can't read *-config-devices.h: No such file or directory
> 
> When only building the tools or docs, without any emulator at all,
> there is even an additional message about missing *-config-target.h
> files.
> 
> Fix it by checking whether any of these files are available before
> using them.
> 
> Fixes: e0447a834d ("configure: Poison all current target-specific #defines")
> Reported-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>  configure | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/configure b/configure
> index 963e35b9a7..a8a9e78c61 100755
> --- a/configure
> +++ b/configure
> @@ -6458,10 +6458,14 @@ fi
>  
>  # Create list of config switches that should be poisoned in common code...
>  # but filter out CONFIG_TCG and CONFIG_USER_ONLY which are special.
> -sed -n -e '/CONFIG_TCG/d' -e '/CONFIG_USER_ONLY/d' \
> -    -e '/^#define / { s///; s/ .*//; s/^/#pragma GCC poison /p; }' \
> -    *-config-devices.h *-config-target.h | \
> -    sort -u > config-poison.h
> +target_configs_h=$(ls *-config-devices.h *-config-target.h 2>/dev/null)
> +if test -n "$target_configs_h" ; then
> +    sed -n -e '/CONFIG_TCG/d' -e '/CONFIG_USER_ONLY/d' \
> +        -e '/^#define / { s///; s/ .*//; s/^/#pragma GCC poison /p; }' \
> +        $target_configs_h | sort -u > config-poison.h
> +else
> +    touch config-poison.h

  :> config-poison.h is safer.

> +fi
>  
>  # Save the configure command line for later reuse.
>  cat <<EOD >config.status
>