From cc260ee8d95c3ffdbb3185c6f1317be7096643a1 Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Mon, 5 Jan 2026 22:15:33 -0500
Subject: [PATCH] xo-arena: empty scaffold (builds, but empty!) [WIP]

---
 CMakeLists.txt                  | 41 +++++++++++++++++++++++++++++++++
 cmake/xo-bootstrap-macros.cmake | 33 ++++++++++++++++++++++++++
 cmake/xo_arenaConfig.cmake.in   | 12 ++++++++++
 include/xo/arena/.gitkeep       |  0
 4 files changed, 86 insertions(+)
 create mode 100644 CMakeLists.txt
 create mode 100644 cmake/xo-bootstrap-macros.cmake
 create mode 100644 cmake/xo_arenaConfig.cmake.in
 create mode 100644 include/xo/arena/.gitkeep

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..70e8d6d
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,41 @@
+# xo-arena/CMakeLists.txt
+
+cmake_minimum_required(VERSION 3.10)
+
+project(xo_arena VERSION 1.0)
+enable_language(CXX)
+
+include(GNUInstallDirs)
+include(cmake/xo-bootstrap-macros.cmake)
+
+xo_cxx_toplevel_options3()
+
+# ----------------------------------------------------------------
+# c++ settings
+
+# one-time project-specific c++ flags. usually empty
+set(PROJECT_CXX_FLAGS "")
+add_definitions(${PROJECT_CXX_FLAGS})
+
+# ----------------------------------------------------------------
+# output targets
+
+#add_subdirectory(utest)
+
+# ----------------------------------------------------------------
+# header-only library
+
+set(SELF_LIB xo_arena)
+xo_add_headeronly_library(${SELF_LIB})
+xo_install_library4(${SELF_LIB} ${PROJECT_NAME}Targets)
+xo_export_cmake_config(${PROJECT_NAME} ${PROJECT_VERSION} ${PROJECT_NAME}Targets)
+
+# ----------------------------------------------------------------
+# input dependencies
+#
+# NOTE: dependency set here must be kept consistent with
+#       xo-arena/cmake/xo_arenaConfig.cmake.in
+
+#xo_headeronly_dependency(${SELF_LIB} xo_flatstring)
+
+# end CMakeLists.txt
diff --git a/cmake/xo-bootstrap-macros.cmake b/cmake/xo-bootstrap-macros.cmake
new file mode 100644
index 0000000..2cf387e
--- /dev/null
+++ b/cmake/xo-bootstrap-macros.cmake
@@ -0,0 +1,33 @@
+# ----------------------------------------------------------------
+# for example:
+#   $ PREFIX=/usr/local   # for example
+#   $ cmake -DCMAKE_MODULE_PATH=prefix -DCMAKE_INSTALL_PREFIX=$PREFIX -B .build
+#
+# will get
+#   CMAKE_MODULE_PATH
+# from xo-cmake-config --cmake-module-path
+#
+# and expect .cmake macros in
+#   CMAKE_MODULE_PATH/xo_macros/xo_cxx.cmake
+# ----------------------------------------------------------------
+
+find_program(XO_CMAKE_CONFIG_EXECUTABLE NAMES xo-cmake-config REQUIRED)
+
+if (("${CMAKE_MODULE_PATH}" STREQUAL "") OR ("${CMAKE_MODULE_PATH}" STREQUAL "prefix"))
+    message(FATAL "could not find xo-cmake-config executable")
+endif()
+
+if (NOT XO_SUBMODULE_BUILD)
+    if (("${CMAKE_MODULE_PATH}" STREQUAL "") OR ("${CMAKE_MODULE_PATH}" STREQUAL prefix))
+        # default to typical install location for xo-project-macros
+        execute_process(COMMAND ${XO_CMAKE_CONFIG_EXECUTABLE} --cmake-module-path OUTPUT_VARIABLE CMAKE_MODULE_PATH)
+        message(STATUS "CMAKE_MODULE_PATH=${CMAKE_MODULE_PATH}")
+    endif()
+endif()
+
+# needs to have been installed somewhere on CMAKE_MODULE_PATH,
+# (e.g. from xo-cmake with the same value for CMAKE_INSTALL_PREFIX)
+#
+include(xo_macros/xo_cxx)
+
+xo_cxx_bootstrap_message()
diff --git a/cmake/xo_arenaConfig.cmake.in b/cmake/xo_arenaConfig.cmake.in
new file mode 100644
index 0000000..b5c3cd5
--- /dev/null
+++ b/cmake/xo_arenaConfig.cmake.in
@@ -0,0 +1,12 @@
+@PACKAGE_INIT@
+
+include(CMakeFindDependencyMacro)
+
+# note: changes to find_dependency() calls here
+#       must coordinate with xo_dependency() calls
+#       in CMakeLists.txt
+#
+#find_dependency(xo_flatstring)
+
+include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")
+check_required_components("@PROJECT_NAME@")
diff --git a/include/xo/arena/.gitkeep b/include/xo/arena/.gitkeep
new file mode 100644
index 0000000..e69de29