use cmake XCode generator for Mac builds

deps/c-utility

@@ -1 +1 @@
-Subproject commit a013ca31fc6fa51f7db2d04675ba53747ac1d1e9
+Subproject commit 3d1cd1c4740049de47375c5a11aa4c0d6892a040

jenkins/osx_c.sh

@@ -14,7 +14,7 @@ CORES=$(grep -c ^processor /proc/cpuinfo 2>/dev/null || sysctl -n hw.ncpu)
 rm -r -f $build_folder
 mkdir -p $build_folder
 pushd $build_folder
-cmake .. -DOPENSSL_ROOT_DIR:PATH=/usr/local/opt/openssl -Drun_unittests:bool=ON
+cmake .. -DOPENSSL_ROOT_DIR:PATH=/usr/local/opt/openssl -Drun_unittests:bool=ON -G Xcode
 cmake --build . -- --jobs=$CORES
 ctest -C "debug" -V
 popd

samples/CMakeLists.txt

@@ -4,6 +4,8 @@
 #this is CMakeLists.txt for samples. There's nothing here, except redirections to 
 #individual protocol samples
 
+usePermissiveRulesForSamplesAndTests()
+
 function(add_sample_directory whatIsBuilding)
 	add_subdirectory(${whatIsBuilding})
 

tests/CMakeLists.txt

@@ -1,6 +1,8 @@
 #Copyright (c) Microsoft. All rights reserved.
 #Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
+usePermissiveRulesForSamplesAndTests()
+
 #this is CMakeLists.txt for the folder tests of mqtt
 add_subdirectory(mqtt_client_ut)
 add_subdirectory(mqtt_codec_ut)