[PATCH 3/3] configure: Emit warning when accelerator requested but not needed

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

In some configurations it might be pointless to check and
compile accelerator code. Do not deselect the accelerator,
but emit a warning.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 configure | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/configure b/configure
index a5159157a49..09e1cd8bfe6 100755
--- a/configure
+++ b/configure
@@ -5514,6 +5514,27 @@ if test $git_update = 'yes' ; then
     (cd "${source_path}" && GIT="$git" "./scripts/git-submodule.sh" update "$git_submodules")
 fi
 
+if [ "$softmmu" = "no" ]; then
+    if [ "$tcg" = "enabled" ]; then
+        echo "WARN: TCG accelerator selected but no target requires it"
+    fi
+    if [ "$kvm" = "enabled" ]; then
+        echo "WARN: KVM accelerator selected but no target requires it"
+    fi
+    if [ "$xen" = "enabled" ]; then
+        echo "WARN: Xen accelerator selected but no target requires it"
+    fi
+    if [ "$hax" = "enabled" ]; then
+        echo "WARN: HAX accelerator selected but no target requires it"
+    fi
+    if [ "$hvf" = "enabled" ]; then
+        echo "WARN: HVF accelerator selected but no target requires it"
+    fi
+    if [ "$whpx" = "enabled" ]; then
+        echo "WARN: WHPX accelerator selected but no target requires it"
+    fi
+fi
+
 config_host_mak="config-host.mak"
 
 echo "# Automatically generated by configure - do not modify" > $config_host_mak
-- 
2.26.2