From 20f824e8e800a47ac19e45cf5392039a02c5836f Mon Sep 17 00:00:00 2001
From: Gulliver <gulliver@traumkristalle.net>
Date: Fri, 18 Sep 2020 18:59:38 +0200
Subject: [PATCH 1/2] added "new" behaviour for Policy CMP0077 which allows to
 control the build options by variables if lib is used by FetchContent of a
 super project

---
 expat/CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/expat/CMakeLists.txt b/expat/CMakeLists.txt
index b2ae0451..4b9308d8 100644
--- a/expat/CMakeLists.txt
+++ b/expat/CMakeLists.txt
@@ -3,6 +3,10 @@
 
 cmake_minimum_required(VERSION 3.1.3)
 
+if(POLICY CMP0077)
+    cmake_policy(SET CMP0077 NEW)
+endif()
+
 project(expat
     VERSION
         2.2.9

From 373e974b11439c6a02def909ce7e27823eaceec4 Mon Sep 17 00:00:00 2001
From: Sebastian Pipping <sebastian@pipping.org>
Date: Sat, 26 Sep 2020 14:52:44 +0200
Subject: [PATCH 2/2] Changes: Document #419

---
 expat/CMakeLists.txt | 24 ++++++++++++++++++++++++
 expat/Changes        |  3 ++-
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/expat/CMakeLists.txt b/expat/CMakeLists.txt
index 4b9308d8..fc2c68d6 100644
--- a/expat/CMakeLists.txt
+++ b/expat/CMakeLists.txt
@@ -3,6 +3,30 @@
 
 cmake_minimum_required(VERSION 3.1.3)
 
+# This allows controlling documented build time switches
+# when Expat is pulled in using the add_subdirectory function, e.g.
+#
+#   set(EXPAT_BUILD_DOCS OFF)
+#   set(EXPAT_BUILD_TOOLS OFF)
+#   add_subdirectory(${expat_SOURCE_DIR}/expat ${expat_BINARY_DIR})
+#
+# would disable compilation of the xmlwf CLI and its man page.
+# Without activating behaviour NEW for policy CMP0077 here,
+# a user with -Wdev enabled would see warning
+#
+#   Policy CMP0077 is not set: option() honors normal variables.  Run "cmake
+#   --help-policy CMP0077" for policy details.  Use the cmake_policy command to
+#   set the policy and suppress this warning.
+#
+#   For compatibility with older versions of CMake, option is clearing the
+#   normal variable 'EXPAT_BUILD_DOCS'.
+#
+# and effectively not be able to adjust option EXPAT_BUILD_DOCS.
+#
+# For more details please see:
+# - https://cmake.org/cmake/help/latest/policy/CMP0077.html
+# - https://github.com/libexpat/libexpat/pull/419
+#
 if(POLICY CMP0077)
     cmake_policy(SET CMP0077 NEW)
 endif()
diff --git a/expat/Changes b/expat/Changes
index a7ca17cf..9d696888 100644
--- a/expat/Changes
+++ b/expat/Changes
@@ -27,7 +27,7 @@ Release x.x.x xxx xxxxxxxxx xx xxxx
                     involving -DEXPAT_CHAR_TYPE=(ushort|wchar_t)
             #360  CMake: Install pre-compiled shipped xmlwf.1 manpage in case
                     of -DEXPAT_BUILD_DOCS=OFF
-       #375 #380  CMake: Fix use of Expat by means of add_subdirectory
+  #375 #380 #419  CMake: Fix use of Expat by means of add_subdirectory
        #407 #408  CMake: Keep expat target name constant at "expat"
                     (i.e. refrain from using the target name to control
                     build artifact filenames)
@@ -42,6 +42,7 @@ Release x.x.x xxx xxxxxxxxx xx xxxx
         Special thanks to:
             asavah
             Ben Wagner
+            Frank Landgraf
             Jeffrey Walton
             Joe Orton
             Kleber Tarcísio