added CMake option USE_BOOST_INT128 to use a Boost.Multiprecision 128-bit integer for MathLib:big{u}int (danmar#7028)

Co-authored-by: chrchr-github <chrchr-github@users.noreply.github.com>

Author: firewave

CMakeLists.txt

@@ -4,6 +4,8 @@ if(MSVC)
 endif()
 project(Cppcheck VERSION 2.16.99 LANGUAGES CXX)
 
+include(cmake/options.cmake)
+
 include(cmake/cxx11.cmake)
 use_cxx11()
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -14,7 +16,6 @@ include(GNUInstallDirs)
 
 include(cmake/compilerCheck.cmake)
 include(cmake/versions.cmake)
-include(cmake/options.cmake)
 include(cmake/findDependencies.cmake)
 include(cmake/compileroptions.cmake)
 include(cmake/compilerDefinitions.cmake)

cmake/compilerDefinitions.cmake

@@ -35,6 +35,9 @@ endif()
 
 if(Boost_FOUND)
     add_definitions(-DHAVE_BOOST)
+    if(USE_BOOST_INT128)
+        add_definitions(-DHAVE_BOOST_INT128)
+    endif()
 endif()
 
 if(ENABLE_CHECK_INTERNAL)

cmake/cxx11.cmake

@@ -3,6 +3,9 @@ macro(use_cxx11)
   if(MSVC AND USE_QT6)
     # CMAKE_CXX_STANDARD 17 was added in CMake 3.8
     set(CMAKE_CXX_STANDARD 17 CACHE STRING "C++ standard to use")
+  elseif(USE_BOOST AND USE_BOOST_INT128)
+    # Boost.Math requires C++14
+    set(CMAKE_CXX_STANDARD 14 CACHE STRING "C++ standard to use")
   else()
     set(CMAKE_CXX_STANDARD 11 CACHE STRING "C++ standard to use")
   endif()

cmake/options.cmake

@@ -67,6 +67,7 @@ endif()
 option(CPPCHK_GLIBCXX_DEBUG "Usage of STL debug checks in Debug build"                      ON)
 option(DISALLOW_THREAD_EXECUTOR "Disallow usage of ThreadExecutor for -j"                   OFF)
 option(USE_BOOST            "Usage of Boost"                                                OFF)
+option(USE_BOOST_INT128     "Usage of Boost.Multiprecision 128-bit integer for Mathlib"     OFF)
 option(USE_LIBCXX           "Use libc++ instead of libstdc++"                               OFF)
 
 if(DISALLOW_THREAD_EXECUTOR AND WIN32)

cmake/printInfo.cmake

@@ -95,6 +95,8 @@ if(USE_BOOST)
     message(STATUS "Boost_FOUND =           ${Boost_FOUND}")
     message(STATUS "Boost_VERSION_STRING =  ${Boost_VERSION_STRING}")
     message(STATUS "Boost_INCLUDE_DIRS =    ${Boost_INCLUDE_DIRS}")
+    message(STATUS "USE_BOOST_INT128 =      ${USE_BOOST_INT128}")
+    message(STATUS)
 endif()
 message(STATUS "USE_LIBCXX =            ${USE_LIBCXX}")
 message(STATUS)

lib/mathlib.h

@@ -26,6 +26,10 @@
 #include <cstdint>
 #include <string>
 
+#if defined(HAVE_BOOST) && defined(HAVE_BOOST_INT128)
+#include <boost/multiprecision/cpp_int.hpp>
+#endif
+
 /// @addtogroup Core
 /// @{
 
@@ -35,6 +39,14 @@ class CPPCHECKLIB MathLib {
     friend class TestMathLib;
 
 public:
+#if defined(HAVE_BOOST) && defined(HAVE_BOOST_INT128)
+    using bigint = boost::multiprecision::int128_t;
+    using biguint = boost::multiprecision::uint128_t;
+#else
+    using bigint = long long;
+    using biguint = unsigned long long;
+#endif
+
     /** @brief value class */
     class value {
     private:
@@ -66,8 +78,6 @@ class CPPCHECKLIB MathLib {
         value shiftRight(const value &v) const;
     };
 
-    using bigint = long long;
-    using biguint = unsigned long long;
     static const int bigint_bits;
 
     /** @brief for conversion of numeric literals - for atoi-like conversions please use strToInt() */