[kvm-unit-tests PATCH 1/2] configure: Introduce add-config

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Allow users to add additional CONFIG_* and override defaults
by concatenating a given file with #define's and #undef's to
lib/config.h

Signed-off-by: Andrew Jones <andrew.jones@xxxxxxxxx>
---
 configure | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/configure b/configure
index 27ae9cc89657..7a1317d0650d 100755
--- a/configure
+++ b/configure
@@ -64,6 +64,8 @@ usage() {
 	                           no environ is provided by the user (enabled by default)
 	    --erratatxt=FILE       specify a file to use instead of errata.txt. Use
 	                           '--erratatxt=' to ensure no file is used.
+	    --add-config=FILE      specify a file containing configs (CONFIG_*) to add on to the
+	                           generated lib/config.h. Use #undef to override default configs.
 	    --host-key-document=HOST_KEY_DOCUMENT
 	                           Specify the machine-specific host-key document for creating
 	                           a PVM image with 'genprotimg' (s390x only)
@@ -153,6 +155,10 @@ while [[ "$1" = -* ]]; do
 	    erratatxt=
 	    [ "$arg" ] && erratatxt=$(eval realpath "$arg")
 	    ;;
+	--add-config)
+	    add_config=
+	    [ "$arg" ] && add_config=$(eval realpath "$arg")
+	    ;;
 	--host-key-document)
 	    host_key_document="$arg"
 	    ;;
@@ -213,6 +219,10 @@ if [ "$erratatxt" ] && [ ! -f "$erratatxt" ]; then
     echo "erratatxt: $erratatxt does not exist or is not a regular file"
     exit 1
 fi
+if [ "$add_config" ] && [ ! -f "$add_config" ]; then
+    echo "add-config: $add_config does not exist or is not a regular file"
+    exit 1
+fi
 
 arch_name=$arch
 [ "$arch" = "aarch64" ] && arch="arm64"
@@ -502,4 +512,8 @@ cat <<EOF >> lib/config.h
 
 EOF
 fi
+if [ "$add_config" ]; then
+    echo "/* Additional configs from $add_config */" >> lib/config.h
+    cat "$add_config" >> lib/config.h
+fi
 echo "#endif" >> lib/config.h
-- 
2.46.0





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