From 6750d42ef1811cb5527f7eaa13fdbbd0cde4b8ef Mon Sep 17 00:00:00 2001
From: Jan Tattermusch <jtattermusch@google.com>
Date: Wed, 7 Feb 2018 15:57:23 +0100
Subject: fine tune cmake find_package usage

---
 cmake/zlib.cmake | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'cmake/zlib.cmake')

diff --git a/cmake/zlib.cmake b/cmake/zlib.cmake
index e4c94f5213..ed7c9c216a 100644
--- a/cmake/zlib.cmake
+++ b/cmake/zlib.cmake
@@ -33,6 +33,12 @@ if("${gRPC_ZLIB_PROVIDER}" STREQUAL "module")
     set(gRPC_INSTALL FALSE)
   endif()
 elseif("${gRPC_ZLIB_PROVIDER}" STREQUAL "package")
+  # zlib installation directory can be configured by setting ZLIB_ROOT
+  # We allow locating zlib using both "CONFIG" and "MODULE" as the expectation
+  # is that many Linux systems will have zlib installed via a distribution
+  # package ("MODULE"), while on Windows the user is likely to have installed
+  # zlib using cmake ("CONFIG").
+  # See https://cmake.org/cmake/help/v3.6/module/FindZLIB.html
   find_package(ZLIB REQUIRED)
 
   if(TARGET ZLIB::ZLIB)
-- 
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