Tests: Revert "require C++14 for the Tutorial"

Revert commit a2a90f41e3 (Tests: require C++14 for the Tutorial,
2019-03-21, v3.15.0-rc1~41^2~2).  In commit d50b31be35 (Clang: For MSVC
ABI do not use modes older than C++14, 2019-07-23) we fixed the C++
standard selection for GNU-like Clang with the MSVC ABI so the test code
itself no longer needs to do it.  In particular, changing the tests in
this way broke the tutorial's narrative.

13 files changed, 27 insertions, 13 deletions

diff --git a/Tests/Tutorial/Complete/CMakeLists.txt b/Tests/Tutorial/Complete/CMakeLists.txt
index 1c97545..9658e65 100644
--- a/Tests/Tutorial/Complete/CMakeLists.txt
+++ b/Tests/Tutorial/Complete/CMakeLists.txt
@@ -7,7 +7,8 @@ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 option(BUILD_SHARED_LIBS "Build using shared libraries" ON)
 
diff --git a/Tests/Tutorial/Consumer/CMakeLists.txt b/Tests/Tutorial/Consumer/CMakeLists.txt
index 5097917..4033b4d 100644
--- a/Tests/Tutorial/Consumer/CMakeLists.txt
+++ b/Tests/Tutorial/Consumer/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.3)
 
 if(NOT DEFINED CMAKE_CXX_STANDARD)
-  set(CMAKE_CXX_STANDARD 14)
+  set(CMAKE_CXX_STANDARD 11)
+  set(CMAKE_CXX_STANDARD_REQUIRED True)
 endif()
 
 
diff --git a/Tests/Tutorial/Step10/CMakeLists.txt b/Tests/Tutorial/Step10/CMakeLists.txt
index 79aadd5..b1d46c4 100644
--- a/Tests/Tutorial/Step10/CMakeLists.txt
+++ b/Tests/Tutorial/Step10/CMakeLists.txt
@@ -7,7 +7,8 @@ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 option(BUILD_SHARED_LIBS "Build using shared libraries" ON)
 
diff --git a/Tests/Tutorial/Step11/CMakeLists.txt b/Tests/Tutorial/Step11/CMakeLists.txt
index 79aadd5..b1d46c4 100644
--- a/Tests/Tutorial/Step11/CMakeLists.txt
+++ b/Tests/Tutorial/Step11/CMakeLists.txt
@@ -7,7 +7,8 @@ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 option(BUILD_SHARED_LIBS "Build using shared libraries" ON)
 
diff --git a/Tests/Tutorial/Step2/CMakeLists.txt b/Tests/Tutorial/Step2/CMakeLists.txt
index 8e50e7c..48afaa3 100644
--- a/Tests/Tutorial/Step2/CMakeLists.txt
+++ b/Tests/Tutorial/Step2/CMakeLists.txt
@@ -1,7 +1,9 @@
 cmake_minimum_required(VERSION 3.3)
 project(Tutorial)
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
 # the version number.
 set(Tutorial_VERSION_MAJOR 1)
 set(Tutorial_VERSION_MINOR 0)
diff --git a/Tests/Tutorial/Step2/directions.txt b/Tests/Tutorial/Step2/directions.txt
index 48de7a2..bb6662c 100644
--- a/Tests/Tutorial/Step2/directions.txt
+++ b/Tests/Tutorial/Step2/directions.txt
@@ -44,7 +44,8 @@ the following:
   cmake_minimum_required(VERSION 3.3)
   project(Tutorial)
 
-  set(CMAKE_CXX_STANDARD 14)
+  set(CMAKE_CXX_STANDARD 11)
+  set(CMAKE_CXX_STANDARD_REQUIRED True)
 
   # the version number.
   set(Tutorial_VERSION_MAJOR 1)
diff --git a/Tests/Tutorial/Step3/CMakeLists.txt b/Tests/Tutorial/Step3/CMakeLists.txt
index baa0a44..f904ea7 100644
--- a/Tests/Tutorial/Step3/CMakeLists.txt
+++ b/Tests/Tutorial/Step3/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.3)
 project(Tutorial)
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 # should we use our own math functions
 option(USE_MYMATH "Use tutorial provided math implementation" ON)
diff --git a/Tests/Tutorial/Step4/CMakeLists.txt b/Tests/Tutorial/Step4/CMakeLists.txt
index 9ce60b9..34eab55 100644
--- a/Tests/Tutorial/Step4/CMakeLists.txt
+++ b/Tests/Tutorial/Step4/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.3)
 project(Tutorial)
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 # should we use our own math functions
 option(USE_MYMATH "Use tutorial provided math implementation" ON)
diff --git a/Tests/Tutorial/Step5/CMakeLists.txt b/Tests/Tutorial/Step5/CMakeLists.txt
index 828b9fc..63e5410 100644
--- a/Tests/Tutorial/Step5/CMakeLists.txt
+++ b/Tests/Tutorial/Step5/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.3)
 project(Tutorial)
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 # should we use our own math functions
 option(USE_MYMATH "Use tutorial provided math implementation" ON)
diff --git a/Tests/Tutorial/Step6/CMakeLists.txt b/Tests/Tutorial/Step6/CMakeLists.txt
index a78b0ff..503a312 100644
--- a/Tests/Tutorial/Step6/CMakeLists.txt
+++ b/Tests/Tutorial/Step6/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.3)
 project(Tutorial)
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 # the version number.
 set(Tutorial_VERSION_MAJOR 1)
diff --git a/Tests/Tutorial/Step7/CMakeLists.txt b/Tests/Tutorial/Step7/CMakeLists.txt
index 33aa039..f2d3839 100644
--- a/Tests/Tutorial/Step7/CMakeLists.txt
+++ b/Tests/Tutorial/Step7/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.3)
 project(Tutorial)
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 # the version number.
 set(Tutorial_VERSION_MAJOR 1)
diff --git a/Tests/Tutorial/Step8/CMakeLists.txt b/Tests/Tutorial/Step8/CMakeLists.txt
index 03dc7c0..c66bf96 100644
--- a/Tests/Tutorial/Step8/CMakeLists.txt
+++ b/Tests/Tutorial/Step8/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.3)
 project(Tutorial)
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 # the version number.
 set(Tutorial_VERSION_MAJOR 1)
diff --git a/Tests/Tutorial/Step9/CMakeLists.txt b/Tests/Tutorial/Step9/CMakeLists.txt
index 4981fe2..309d513 100644
--- a/Tests/Tutorial/Step9/CMakeLists.txt
+++ b/Tests/Tutorial/Step9/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.3)
 project(Tutorial)
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 # the version number.
 set(Tutorial_VERSION_MAJOR 1)