From 17cd9b2de0ff7f04fbd7924dd2bb3ab6316b9022 Mon Sep 17 00:00:00 2001
From: Jan Kuhlmann <33833587+M2-TE@users.noreply.github.com>
Date: Tue, 12 Nov 2024 14:52:31 +0100
Subject: [PATCH] compile example executables if top level project

---
 CMakeLists.txt | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b924a2f..364a138 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,9 @@
-cmake_minimum_required(VERSION 3.19)
+cmake_minimum_required(VERSION 3.21)
 project(tglib LANGUAGES CXX)
 
+# leave compiler options up to parent project, as these libs are header-only
+
+# create header-only interface target for graphs.hpp
 add_library(tglib_graphs INTERFACE)
 add_library(${PROJECT_NAME}::graphs ALIAS tglib_graphs)
 target_sources(tglib_graphs PUBLIC
@@ -8,9 +11,20 @@ target_sources(tglib_graphs PUBLIC
     BASE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}
     FILES graphs.hpp)
 
+# create header-only interface target for tables.hpp
 add_library(tglib_tables INTERFACE)
 add_library(${PROJECT_NAME}::tables ALIAS tglib_tables)
 target_sources(tglib_tables PUBLIC
     FILE_SET HEADERS
     BASE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}
-    FILES tables.hpp)
\ No newline at end of file
+    FILES tables.hpp)
+
+# compile example binaries as executables
+if (PROJECT_IS_TOP_LEVEL)
+    set(CMAKE_CXX_STANDARD 14)
+    set(CMAKE_CXX_STANDARD_REQUIRED ON)
+    add_executable(tglib_graphs_example "${CMAKE_CURRENT_SOURCE_DIR}/graphs.cpp")
+    target_link_libraries(tglib_graphs_example PRIVATE tglib::graphs)
+    add_executable(tglib_tables_example "${CMAKE_CURRENT_SOURCE_DIR}/tables.cpp")
+    target_link_libraries(tglib_tables_example PRIVATE tglib::tables)
+endif()
\ No newline at end of file