Функция для подключения вычислений с высокой точностью

CMLibCommon.cmake

@@ -30,6 +30,7 @@ include(CMLibLSBInfo)
 include(CMLibCompiler)
 include(CMLibCompilerFlags)
 include(CMLibDistCC)
+include(CMLibHighPrecisionMath)
 include(CMLibGenerateCompilerFeaturesHPP)
 include(CMLibFlagRemove)
 include(CMLibCotire)

CMLibHighPrecisionMath.cmake

@@ -0,0 +1,40 @@
+function(enable_high_precision_math)
+  set(options QUAD MPFR)
+  set(oneValueArgs)
+  set(multiValueArgs)
+
+  cmake_parse_arguments(_PKG "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+
+  if(MPFR AND QUAD)
+    message(FATAL_ERROR "Mutually exclusive options QUAD and MPFR")
+  endif()
+
+  if(MPFR)
+    find_package(MPFR)
+    if(MPFR_FOUND)
+      find_package(MPFRCppThirdparty)
+    endif()
+    return()
+  endif()
+
+  if(QUAD)
+    find_package(Quadmath)
+    if(QUADMATH_FOUND)
+      add_definitions(-DHAVE_QUADMATH=1)
+    endif()
+    return()
+  endif()
+
+  # Default
+  find_package(Quadmath)
+  if(QUADMATH_FOUND)
+    add_definitions(-DHAVE_QUADMATH=1)
+  else()
+    find_package(MPFR)
+    if(MPFR_FOUND)
+      find_package(MPFRCppThirdparty)
+    else()
+      message(FATAL_ERROR "Nor Quadmath, nor MPFR found.")
+    endif()
+  endif()
+endfunction()