From 42b550f200bf1589dbc24a4fe75476d29f02fd65 Mon Sep 17 00:00:00 2001
From: Richard Cole <imrichardcole@gmail.com>
Date: Sun, 10 Nov 2024 13:30:12 +0000
Subject: [PATCH] if using MSVC, then add /MP flag to speed up builds

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 69e32a2d09..db8b694dc9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -91,6 +91,11 @@ if (QL_USE_STD_CLASSES)
     set(QL_USE_STD_SHARED_PTR ON)
 endif()
 
+if (MSVC)
+    # take advantage of parallel compilation - https://learn.microsoft.com/en-us/cpp/build/reference/mp-build-with-multiple-processes?view=msvc-170
+    add_compile_options(-MP)
+endif()
+
 # Set the default warning level we use to pass the GitHub workflows
 if (QL_ENABLE_DEFAULT_WARNING_LEVEL)
     if (MSVC)