Fix #14336: Raise minimum c++ version to c++17

Author: Leander Schulten

CMakeLists.txt

@@ -3,8 +3,8 @@ project(Cppcheck VERSION 2.18.99 LANGUAGES CXX)
 
 include(cmake/options.cmake)
 
-include(cmake/cxx11.cmake)
-use_cxx11()
+include(cmake/cxx17.cmake)
+use_cxx17()
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 

cmake/cxx11.cmake

@@ -0,0 +1,3 @@
+macro(use_cxx17)
+  set(CMAKE_CXX_STANDARD 17 CACHE STRING "C++ standard to use")
+endmacro()

cmake/cxx17.cmake

@@ -15,7 +15,7 @@ if it has non-standard syntax, as is common in for example embedded projects.
 Supported code and platforms:
 
 - Cppcheck checks non-standard code that contains various compiler extensions, inline assembly code, etc.
-- Cppcheck should be compilable by any compiler that supports C++11 or later.
+- Cppcheck should be compilable by any compiler that supports C++17 or later.
 - Cppcheck is cross platform and is used in various posix/windows/etc environments.
 
 The checks in Cppcheck are not perfect. There are bugs that should be found, that Cppcheck fails to detect.

man/manual-premium.md

@@ -16,7 +16,7 @@ if it has non-standard syntax, as is common in for example embedded projects.
 Supported code and platforms:
 
 - Cppcheck checks non-standard code that contains various compiler extensions, inline assembly code, etc.
-- Cppcheck should be compilable by any compiler that supports C++11 or later.
+- Cppcheck should be compilable by any compiler that supports C++17 or later.
 - Cppcheck is cross platform and is used in various posix/windows/etc environments.
 
 The checks in Cppcheck are not perfect. There are bugs that should be found, that Cppcheck fails to detect.

man/manual.md

@@ -51,10 +51,7 @@ This is not just a tool for mainstream gcc/msvc c/c++ developers. If you can com
 
 ## C++ language
 
-Our goal is to be highly portable. Users must be able to compile Cppcheck with GCC 4.8 or Visual Studio 2013.
-
-No C++14 is allowed. A subset of C++11 is allowed.
-
+Our goal is to be highly portable. Users must be able to compile Cppcheck with the default compiler of supported Debian/Ubuntu/Windows versions.
 
 ## Avoid dependencies
 

philosophy.md

@@ -34,7 +34,7 @@ You can stop the script whenever you like with Ctrl C.
 
 ## Compiling
 
-Cppcheck requires a C++ compiler with (partial) C++11 support. Minimum required versions are GCC 5.1 / Clang 3.5 / Visual Studio 2015.
+Cppcheck requires a C++ compiler with C++17 support. Minimum required versions are GCC 7 / Clang 5 / Visual Studio 2017.
 
 To build the GUI application, you need to use the CMake build system.
 
@@ -197,7 +197,7 @@ make MATCHCOMPILER=yes FILESDIR=/usr/share/cppcheck HAVE_RULES=yes CXXOPTS="-O2"
 If you just want to build Cppcheck without dependencies then you can use this command:
 
 ```shell
-g++ -o cppcheck -std=c++11 -Iexternals -Iexternals/simplecpp -Iexternals/tinyxml2 -Iexternals/picojson -Ilib -Ifrontend frontend/*.cpp cli/*.cpp lib/*.cpp externals/simplecpp/simplecpp.cpp externals/tinyxml2/tinyxml2.cpp
+g++ -o cppcheck -std=c++17 -Iexternals -Iexternals/simplecpp -Iexternals/tinyxml2 -Iexternals/picojson -Ilib -Ifrontend frontend/*.cpp cli/*.cpp lib/*.cpp externals/simplecpp/simplecpp.cpp externals/tinyxml2/tinyxml2.cpp
 ```
 
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