From 878f1d51f5cb60c2b0582bb6d55105a4a7aa8b22 Mon Sep 17 00:00:00 2001
From: Christoph Schulz <schulzcbs@gmail.com>
Date: Wed, 21 Aug 2019 14:02:31 +0200
Subject: [PATCH] Add ENABLE_PRECOMPILED option.

You might want to disable this flag when building with Ninja.
---
 CMakeLists.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6087e3af..dac4e352 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1080,7 +1080,8 @@ if(ZMQ_BUILD_FRAMEWORK)
   COMMENT "Perf tools")
 endif()
 
-if(MSVC)
+option(ENABLE_PRECOMPILED "Enable precompiled headers, if possible" ON)
+if(MSVC AND ENABLE_PRECOMPILED)
   # default for all sources is to use precompiled headers
   foreach(source ${sources})
     # C and C++ can not use the same precompiled header