From 7c22ac6b82913969e874612ee519d6f4eea0ed09 Mon Sep 17 00:00:00 2001
From: Andrey Astafyev <dev@246060.ru>
Date: Tue, 6 Jul 2021 04:40:23 +0300
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---
 CMLibCommon.cmake            |  1 +
 CMLibHighPrecisionMath.cmake | 40 ++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 CMLibHighPrecisionMath.cmake

diff --git a/CMLibCommon.cmake b/CMLibCommon.cmake
index 53d088d..8c5a77b 100644
--- a/CMLibCommon.cmake
+++ b/CMLibCommon.cmake
@@ -30,6 +30,7 @@ include(CMLibLSBInfo)
 include(CMLibCompiler)
 include(CMLibCompilerFlags)
 include(CMLibDistCC)
+include(CMLibHighPrecisionMath)
 include(CMLibGenerateCompilerFeaturesHPP)
 include(CMLibFlagRemove)
 include(CMLibCotire)
diff --git a/CMLibHighPrecisionMath.cmake b/CMLibHighPrecisionMath.cmake
new file mode 100644
index 0000000..3204f60
--- /dev/null
+++ b/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()