From 5c589dd138305e9073694dc9213fe839f9d9dce5 Mon Sep 17 00:00:00 2001
From: Martin Stump <11492152+globberwops@users.noreply.github.com>
Date: Wed, 9 Dec 2020 11:37:01 +0100
Subject: [PATCH 1/4] Add MAIN_PROJECT check for test and install options

---
 CMakeLists.txt | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fa77a5aed..93f7986a8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,13 @@ cmake_minimum_required(VERSION 3.1)
 ##
 project(nlohmann_json VERSION 3.9.1 LANGUAGES CXX)
 
+##
+## MAIN_PROJECT CHECK
+##
+if (CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
+  set(MAIN_PROJECT ON)
+endif()
+
 ##
 ## INCLUDE
 ##
@@ -21,8 +28,8 @@ if (POLICY CMP0077)
     cmake_policy(SET CMP0077 NEW)
 endif ()
 
-option(JSON_BuildTests "Build the unit tests when BUILD_TESTING is enabled." ON)
-option(JSON_Install "Install CMake targets during install step." ON)
+option(JSON_BuildTests "Build the unit tests when BUILD_TESTING is enabled." ${MAIN_PROJECT})
+option(JSON_Install "Install CMake targets during install step." ${MAIN_PROJECT})
 option(JSON_MultipleHeaders "Use non-amalgamated version of the library." OFF)
 option(JSON_ImplicitConversions "Enable implicit conversions." ON)
 
@@ -101,9 +108,8 @@ CONFIGURE_FILE(
 ## TESTS
 ## create and configure the unit test target
 ##
-include(CTest) #adds option BUILD_TESTING (default ON)
-
-if(BUILD_TESTING AND JSON_BuildTests)
+if (JSON_BuildTests)
+    include(CTest) #adds option BUILD_TESTING (default ON)
     enable_testing()
     add_subdirectory(test)
 endif()

From 790508887e75a5be3f2ccc35a42ca474876bb86c Mon Sep 17 00:00:00 2001
From: Martin Stump <11492152+globberwops@users.noreply.github.com>
Date: Wed, 9 Dec 2020 12:39:44 +0100
Subject: [PATCH 2/4] Set MAIN_PROJECT=OFF initially

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 93f7986a8..06761947b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,6 +9,7 @@ project(nlohmann_json VERSION 3.9.1 LANGUAGES CXX)
 ##
 ## MAIN_PROJECT CHECK
 ##
+set(MAIN_PROJECT OFF)
 if (CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
   set(MAIN_PROJECT ON)
 endif()

From ea759d03600b24af619daa7a3a1e277df50ca5b3 Mon Sep 17 00:00:00 2001
From: Martin Stump <11492152+globberwops@users.noreply.github.com>
Date: Sun, 13 Dec 2020 20:34:51 +0100
Subject: [PATCH 3/4] Compare to CMAKE_CURRENT_SOURCE_DIR for main project
 check

---
 CMakeLists.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 06761947b..7c4d8ad8c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,9 +8,10 @@ project(nlohmann_json VERSION 3.9.1 LANGUAGES CXX)
 
 ##
 ## MAIN_PROJECT CHECK
+## determine if nlohmann_json is built as a subproject (using add_subdirectory) or if it is the main project
 ##
 set(MAIN_PROJECT OFF)
-if (CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
+if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
   set(MAIN_PROJECT ON)
 endif()
 

From 1771e9249fd09819d1f857d364e49b4178abd572 Mon Sep 17 00:00:00 2001
From: Martin Stump <11492152+globberwops@users.noreply.github.com>
Date: Mon, 14 Dec 2020 10:59:38 +0100
Subject: [PATCH 4/4] Remove comment on CTest inclusion

Co-authored-by: Niels Lohmann <niels.lohmann@gmail.com>
---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7c4d8ad8c..44ede3e79 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -111,7 +111,7 @@ CONFIGURE_FILE(
 ## create and configure the unit test target
 ##
 if (JSON_BuildTests)
-    include(CTest) #adds option BUILD_TESTING (default ON)
+    include(CTest)
     enable_testing()
     add_subdirectory(test)
 endif()