From 2ff7bb9b8da561eb5532f526d0d34b430f785161 Mon Sep 17 00:00:00 2001
From: Denis Blank <denis.blank@outlook.com>
Date: Sun, 18 Nov 2018 19:00:38 +0100
Subject: [PATCH] Improve 4ae560156348 and allow it to be set as an option

---
 CMakeLists.txt            |  7 +++++++
 cmake/compiler/msvc.cmake | 11 ++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 042baf9..08ddc97 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -57,6 +57,13 @@ option(CTI_CONTINUABLE_WITH_LIGHT_TESTS
        "Disable some template heavy unit tests (for CI usage)"
        OFF)
 
+# Top level project settings only
+if (IS_TOP_LEVEL_PROJECT)
+  set(CTI_CONTINUABLE_WITH_CONCURRENT_JOBS
+       "0" CACHE STRING
+       "Set the number of concurrent compilation jobs (0 = unlimited, for CI usage)")
+endif()
+
 include(cmake/CMakeLists.txt)
 
 set(THREADS_PREFER_PTHREAD_FLAG ON)
diff --git a/cmake/compiler/msvc.cmake b/cmake/compiler/msvc.cmake
index 340456f..74f5705 100644
--- a/cmake/compiler/msvc.cmake
+++ b/cmake/compiler/msvc.cmake
@@ -31,9 +31,18 @@ if (PLATFORM EQUAL 64)
       -D_WIN64)
 endif()
 
+if (CTI_CONTINUABLE_WITH_CONCURRENT_JOBS)
+  target_compile_options(continuable-features-flags
+    INTERFACE
+      /MP${CTI_CONTINUABLE_WITH_CONCURRENT_JOBS})
+else()
+  target_compile_options(continuable-features-flags
+    INTERFACE
+      /MP)
+endif()
+
 target_compile_options(continuable-features-flags
   INTERFACE
-    /MP2
     /bigobj
     /permissive-)