[PATCH v2 1/5] configure: Add the possibility to read options from meson_options.txt

[Thomas Huth <thuth@redhat.com>]

To avoid double maintenance between the configure script and
meson_options.txt, add some simple logic in the configure script
to read the options from meson_options.txt.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 configure | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 9a79a004d7..528e9c80c5 100755
--- a/configure
+++ b/configure
@@ -836,6 +836,8 @@ fi
 
 werror=""
 
+meson_options=""
+
 for opt do
   optarg=$(expr "x$opt" : 'x[^=]*=\(.*\)')
   case "$opt" in
@@ -1581,6 +1583,26 @@ for opt do
   ;;
   --disable-slirp-smbd) slirp_smbd=no
   ;;
+  --enable-*)
+      arg=$(printf %s\\n "$opt" | sed -e "s/--enable-//" -e "s/-/_/g")
+      if ! grep -q "option('$arg', type[ ]*: 'feature'" \
+                $source_path/meson_options.txt; then
+          printf "ERROR: unknown option %s\n" "$opt"
+          printf "Try '%s --help' for more information\n" "$0"
+          exit 1
+      fi
+      meson_options="$meson_options -D$arg=enabled"
+  ;;
+  --disable-*)
+      arg=$(printf %s\\n "$opt" | sed -e "s/--disable-//" -e "s/-/_/g")
+      if ! grep -q "option('$arg', type[ ]*: 'feature'" \
+                $source_path/meson_options.txt; then
+          printf "ERROR: unknown option %s\n" "$opt"
+          printf "Try '%s --help' for more information\n" "$0"
+          exit 1
+      fi
+      meson_options="$meson_options -D$arg=disabled"
+  ;;
   *)
       echo "ERROR: unknown option $opt"
       echo "Try '$0 --help' for more information"
@@ -5211,7 +5233,7 @@ if test "$skip_meson" = no; then
         -Dvhost_user_blk_server=$vhost_user_blk_server -Dmultiprocess=$multiprocess \
         -Dfuse=$fuse -Dfuse_lseek=$fuse_lseek -Dguest_agent_msi=$guest_agent_msi -Dbpf=$bpf\
         $(if test "$default_feature" = no; then echo "-Dauto_features=disabled"; fi) \
-	-Dtcg_interpreter=$tcg_interpreter \
+        -Dtcg_interpreter=$tcg_interpreter $meson_options \
         $cross_arg \
         "$PWD" "$source_path"
 
-- 
2.27.0