From c8ac0ceb493c03af3edbcb008503b001bcba50be Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Tue, 16 Apr 2024 13:30:16 -0400
Subject: [PATCH] cmake: + xo_self_headeronly_dependency()

---
 cmake/xo_macros/xo_cxx.cmake | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/cmake/xo_macros/xo_cxx.cmake b/cmake/xo_macros/xo_cxx.cmake
index e63762f8..3fcf3e2f 100644
--- a/cmake/xo_macros/xo_cxx.cmake
+++ b/cmake/xo_macros/xo_cxx.cmake
@@ -736,6 +736,19 @@ macro(xo_self_dependency target dep)
     target_link_libraries(${target} PUBLIC ${dep})
 endmacro()
 
+# dependency on target provided from this codebase.
+#
+# Similar comments as for xo_self_dependency()
+# 1. don't need find_package() in this case,  since details of dep targets
+#    must be known to cmake for it to build them.
+# 2. in any case, can't use find_package() when cmake runs,
+#    because supporting .cmake files haven't been generated yet
+# 3. need to use INTERFACE instead of PUBLIC for a header-only dep
+#
+macro(xo_self_headeronly_dependency target dep)
+    target_link_libraries(${target} INTERFACE ${dep})
+endmacro()
+
 # ----------------------------------------------------------------
 # need this when linking pybind11-generated libraries
 #