cannot treat the schema scanner source as a config file, so add /*WARNING*/

cmake/schema_scanner/schemaScanner.cc

@@ -7,6 +7,12 @@
  * generated files will be called.
  */
 
+/* WARNING
+ * If you modify this file, you must re-run cmake. It doesn't seem to be possible
+ * to re-run cmake automatically, as CMake's configure_file() gets confused by
+ * the '${' and '}' in writeLists() below.
+ */
+
 extern "C" {
 #  include "expparse.h"
 #  include "expscan.h"

cmake/schema_scanner/schemaScanner.cmake

@@ -101,5 +101,7 @@ macro(SCHEMA_CMLIST SCHEMA_FILE)
   foreach(_dir ${_list})
     add_subdirectory(${_dir} ${_dir}) #specify source and binary dirs as the same
   endforeach(_dir ${_ss_out})
-  configure_file(${SCHEMA_FILE} ${SCANNER_BUILD_DIR}/${_schema}) #if multiple schemas in one file, _schema is the last one printed.
+  # configure_file forces cmake to run again if the schema has been modified
+  #if multiple schemas in one file, _schema is the last one printed.
+  configure_file(${SCHEMA_FILE} ${SCANNER_BUILD_DIR}/${_schema})
 endmacro(SCHEMA_CMLIST SCHEMA_FILE)