diff --git a/cmake/xo_macros/xo_cxx.cmake b/cmake/xo_macros/xo_cxx.cmake
index 31e8b879..d07fb3ad 100644
--- a/cmake/xo_macros/xo_cxx.cmake
+++ b/cmake/xo_macros/xo_cxx.cmake
@@ -5,7 +5,7 @@ option(XO_ENABLE_OPENGL "enable opengl dependency for imgui apps" ON)
 option(XO_ENABLE_ASM "generate assembler output (.s files)" OFF)
 
 macro(xo_cxx_config_message)
-    message(STATUS "GUESSED_CMAKE_CMD=cmake -DXO_CMAKE_CONFIG_EXECUTABLE=${XO_CMAKE_CONFIG_EXECUTABLE} -DENABLE_TESTING=${ENABLE_TESTING} -DXO_ENABLE_DOCS=${XO_ENABLE_DCS} -DXO_ENABLE_EXAMPLES=${XO_ENABLE_EXAMPLES} -DXO_ENABLE_VULKAN=${XO_ENABLE_VULKAN} -DXO_ENABLE_OPENGL=${XO_ENABLE_OPENGL} -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD} -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX} -DCMAKE_MODULE_PATH=${CMAKE_MODULE_PATH} -DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH} -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} -DCMAKE_INSTALL_DOCDIR=${CMAKE_INSTALL_DOCDIR} -B ${CMAKE_BINARY_DIR}")
+    message(STATUS "GUESSED_CMAKE_CMD=cmake -DXO_CMAKE_CONFIG_EXECUTABLE=${XO_CMAKE_CONFIG_EXECUTABLE} -DENABLE_TESTING=${ENABLE_TESTING} -DXO_ENABLE_DOCS=${XO_ENABLE_DOCS} -DXO_ENABLE_ASM=${XO_ENABLE_ASM} -DXO_ENABLE_EXAMPLES=${XO_ENABLE_EXAMPLES} -DXO_ENABLE_VULKAN=${XO_ENABLE_VULKAN} -DXO_ENABLE_OPENGL=${XO_ENABLE_OPENGL} -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD} -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX} -DCMAKE_MODULE_PATH=${CMAKE_MODULE_PATH} -DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH} -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} -DCMAKE_INSTALL_DOCDIR=${CMAKE_INSTALL_DOCDIR} -B ${CMAKE_BINARY_DIR}")
     message(STATUS "XO_CMAKE_CONFIG_EXECUTABLE=${XO_CMAKE_CONFIG_EXECUTABLE}")
     message(STATUS "CMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}")
 endmacro()
@@ -40,7 +40,7 @@ endmacro()
 # deprecated -- prefer xo_cxx_toplevel_options3()
 macro(xo_cxx_toplevel_options2)
     if (NOT DEFINED _xo_cxx_toplevel_done)
-        message("xo_cxx_toplevel_options2: PROJECT=${PROJECT_NAME}")
+        message(STATUS "xo_cxx_toplevel_options2: PROJECT=${PROJECT_NAME}")
 
         enable_language(CXX)
         xo_toplevel_compile_options()
@@ -76,6 +76,7 @@ endmacro()
 macro(xo_cxx_toplevel_options3)
     xo_cxx_toplevel_options2()
     xo_toplevel_config2()
+    xo_generate_reconfigure_script()
 endmacro()
 
 # deprecated, I think?
@@ -270,6 +271,33 @@ macro(xo_toplevel_asm_config2)
     endif()
 endmacro()
 
+function(xo_generate_reconfigure_script)
+    set(_reconfigure_script "${CMAKE_BINARY_DIR}/reconfigure.sh")
+
+    # In submodule build: only generate at umbrella toplevel
+    # In standalone build: always generate
+    if(XO_SUBMODULE_BUILD AND NOT (CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR))
+        return()
+    endif()
+
+    file(WRITE ${_reconfigure_script} "#!/bin/bash\n")
+    file(APPEND ${_reconfigure_script} "# Generated by cmake - rerun to reconfigure\n")
+    file(APPEND ${_reconfigure_script} "cmake \\\n")
+    file(APPEND ${_reconfigure_script} "  -B ${CMAKE_BINARY_DIR} \\\n")
+    file(APPEND ${_reconfigure_script} "  -S ${CMAKE_SOURCE_DIR} \\\n")
+    file(APPEND ${_reconfigure_script} "  -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} \\\n")
+    file(APPEND ${_reconfigure_script} "  -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX} \\\n")
+    file(APPEND ${_reconfigure_script} "  -DXO_ENABLE_DOCS=${XO_ENABLE_DOCS} \\\n")
+    file(APPEND ${_reconfigure_script} "  -DXO_ENABLE_EXAMPLES=${XO_ENABLE_EXAMPLES} \\\n")
+    file(APPEND ${_reconfigure_script} "  -DXO_ENABLE_ASM=${XO_ENABLE_ASM} \\\n")
+    file(APPEND ${_reconfigure_script} "  \"$@\"\n")
+    file(CHMOD ${_reconfigure_script} PERMISSIONS
+        OWNER_READ OWNER_WRITE OWNER_EXECUTE
+        GROUP_READ GROUP_EXECUTE
+        WORLD_READ WORLD_EXECUTE)
+    message(STATUS "Generated ${_reconfigure_script}")
+endfunction()
+
 # target to build+install coverage report.
 #
 macro(xo_utest_coverage_config2)