Require C++14 (remove support for VS2017)

CMakeLists.txt

@@ -449,7 +449,7 @@ function(WAVM_SET_TARGET_COMPILE_OPTIONS TARGET_NAME)
 	)
 
 	# Target C++11.
-	target_compile_features(${TARGET_NAME} PUBLIC cxx_std_11)
+	target_compile_features(${TARGET_NAME} PUBLIC cxx_std_14)
 
 	# Set sanitizer options.
 	WAVM_SET_TARGET_SANITIZER_OPTIONS(${TARGET_NAME})

Doc/Building.md

@@ -1,6 +1,6 @@
 # Building WAVM from source
 
-To build WAVM, you'll need CMake and [LLVM 9.0](https://github.com/WAVM/WAVM-LLVM/releases/tag/9.x).
+To build WAVM, you'll need CMake and [LLVM 9.0+](https://github.com/WAVM/WAVM-LLVM/releases/tag/9.x).
 If CMake can't find your LLVM directory, you can manually give it the location in the LLVM_DIR CMake
 configuration variable. Note that on Windows, you must compile LLVM from source, and manually point
 the LLVM_DIR configuration variable at `<LLVM build directory>\lib\cmake\llvm`.
@@ -21,7 +21,7 @@ Otherwise, you can download it from the [CMake website](https://cmake.org/downlo
 
 #### Windows
 
-You can use Visual Studio 2017+ to compile WAVM. If you don't have Visual Studio, you can use the
+You can use Visual Studio 2019+ to compile WAVM. If you don't have Visual Studio, you can use the
 freely available Visual Studio C++ Build Tools for Visual Studio or Visual Studio Community, both
 available from the Visual Studio [download page](https://visualstudio.microsoft.com/downloads/).
 
@@ -42,8 +42,7 @@ You'll need to install Xcode from the App Store.
     cmake <path to WAVM source> -G <generator> -DLLVM_DIR=<path to LLVM build>/lib/cmake/llvm
     ```
    What you pass as `<generator>` depends on your platform:
-   * For Windows, you'll use either `"Visual Studio 15 2017 Win64"` (aka Visual Studio 2017) or
-     `"Visual Studio 16 2019"` (aka Visual Studio 2019).
+   * For Windows, you'll use either `"Visual Studio 16 2019"` (aka Visual Studio 2019).
    * For Linux and MacOS, you'll use `"Unix Makefiles"`.
 
    If `cmake` executes successfully, it will create either a Visual Studio solution file or

azure-pipelines.yml

@@ -17,15 +17,6 @@ stages:
 
               git diff --exit-code
 
-      # Win64 VS2017
-      - template: Build/azure-pipelines/windows-build-job-template.yml
-        parameters:
-          name: Win64_VS2017
-          vsVersion: '2017'
-          platform: 'x64'
-          llvmBuildBaseName: 'Win64'
-          llvmVersion: '9.x'
-
       # Win64 VS2019
       - template: Build/azure-pipelines/windows-build-job-template.yml
         parameters: