From 7e80de41aa4f766fd3e2b0f6694f6fb1d9740f80 Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Sat, 7 Oct 2023 00:34:56 -0400
Subject: [PATCH] revert failed experiment

---
 cmake/xo_cxx.cmake | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cmake/xo_cxx.cmake b/cmake/xo_cxx.cmake
index 740e0833..e82d21d1 100644
--- a/cmake/xo_cxx.cmake
+++ b/cmake/xo_cxx.cmake
@@ -58,8 +58,11 @@ macro(xo_include_headeronly_options2 target)
     #   need that build directory to also appear in
     #   compiler's include path
     #
+    # NOTE: using INTERFACE here is mandatory.  Otherwise get error:
+    #        target_include_directories may only set INTERFACE properties on INTERFACE targets
+    #
     target_include_directories(
-      ${target} PUBLIC
+      ${target} INTERFACE
       $<INSTALL_INTERFACE:include>
       $<INSTALL_INTERFACE:include/xo/${target}>
       $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>              # e.g. for #include "indentlog/scope.hpp"