From 7e216fdf0c3ef418c617b3f1bb2de152ca8106f0 Mon Sep 17 00:00:00 2001
From: Sean Darcy <darcys22@gmail.com>
Date: Mon, 4 Sep 2023 08:31:35 +1000
Subject: [PATCH] only include libraries if they dont already exist

---
 external/CMakeLists.txt | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index dc4a4c6..94d331a 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -1,14 +1,22 @@
-set(CPR_USE_SYSTEM_CURL ON CACHE BOOL "" FORCE)
-add_subdirectory(cpr)
-set(SECP256K1_ENABLE_MODULE_RECOVERY ON CACHE BOOL "" FORCE)
-set(SECP256K1_VALGRIND OFF CACHE BOOL "" FORCE)
-set(SECP256K1_BUILD_BENCHMARK OFF CACHE BOOL "" FORCE)
-set(SECP256K1_BUILD_TESTS OFF CACHE BOOL "" FORCE)
-set(SECP256K1_BUILD_EXHAUSTIVE_TESTS OFF CACHE BOOL "" FORCE)
-set(SECP256K1_BUILD_CTIME_TESTS OFF CACHE BOOL "" FORCE)
-set(SECP256K1_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
-add_subdirectory(secp256k1)
-add_subdirectory(Catch2)
+if(NOT TARGET cpr)
+    set(CPR_USE_SYSTEM_CURL ON CACHE BOOL "" FORCE)
+    add_subdirectory(cpr)
+endif()
+
+if(NOT TARGET secp256k1)
+    set(SECP256K1_ENABLE_MODULE_RECOVERY ON CACHE BOOL "" FORCE)
+    set(SECP256K1_VALGRIND OFF CACHE BOOL "" FORCE)
+    set(SECP256K1_BUILD_BENCHMARK OFF CACHE BOOL "" FORCE)
+    set(SECP256K1_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+    set(SECP256K1_BUILD_EXHAUSTIVE_TESTS OFF CACHE BOOL "" FORCE)
+    set(SECP256K1_BUILD_CTIME_TESTS OFF CACHE BOOL "" FORCE)
+    set(SECP256K1_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
+    add_subdirectory(secp256k1)
+endif()
+
+if(NOT TARGET Catch2)
+    add_subdirectory(Catch2)
+endif()
 
 # RLPValue is built using autotools
 include(ExternalProject)
@@ -38,6 +46,8 @@ add_dependencies(rlpvalue librlpvalue)
 set_target_properties(rlpvalue PROPERTIES IMPORTED_LOCATION ${RLP_SHARED_LIB})
 set_target_properties(rlpvalue PROPERTIES INTERFACE_INCLUDE_DIRECTORIES ${RLP_INCLUDES})
 
-set(JSON_BuildTests OFF CACHE INTERNAL "")
-set(JSON_MultipleHeaders ON CACHE BOOL "") # Allows multi-header nlohmann use
-add_subdirectory(json EXCLUDE_FROM_ALL)
+if(NOT TARGET nlohmann_json)
+    set(JSON_BuildTests OFF CACHE INTERNAL "")
+    set(JSON_MultipleHeaders ON CACHE BOOL "") # Allows multi-header nlohmann use
+    add_subdirectory(json EXCLUDE_FROM_ALL)
+endif()