From 9178193ad2493ceec9fffc9ad5849e15fe7e42c0 Mon Sep 17 00:00:00 2001
From: ajneu <ajneu@users.noreply.github.com>
Date: Fri, 1 Dec 2017 21:15:32 +0100
Subject: [PATCH] cmake: date as INTERFACE target, to enable automatic
 include_directory        (for cases where just date.h, but not "tz.h and its
 lib" are needed)

---
 CMakeLists.txt | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ba1b909..8aefbcc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,6 +72,19 @@ target_include_directories(tz PUBLIC
     >
 )
 
+add_library(date INTERFACE) # an interface (not a library), to enable automatic include_directory (for when just date.h, but not "tz.h and its lib" are needed)
+
+# add include folders to the INTERFACE and targets that consume it
+target_include_directories(date INTERFACE
+    $<BUILD_INTERFACE:
+        ${CMAKE_CURRENT_SOURCE_DIR}/${HEADER_FOLDER}
+    >
+    $<INSTALL_INTERFACE:
+        include
+    >
+)
+
+
 install( TARGETS tz DESTINATION lib )
 install( DIRECTORY ${HEADER_FOLDER}/ DESTINATION include/ )