From 57396140b292f0cc6dceebd3f0088c6d4b2a9072 Mon Sep 17 00:00:00 2001
From: Andrey Astafyev <dev@246060.ru>
Date: Tue, 5 Mar 2019 23:33:32 +0300
Subject: [PATCH] QuadMath

---
 FindQuadmath.cmake | 50 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 FindQuadmath.cmake

diff --git a/FindQuadmath.cmake b/FindQuadmath.cmake
new file mode 100644
index 0000000..eb5ac86
--- /dev/null
+++ b/FindQuadmath.cmake
@@ -0,0 +1,50 @@
+# Module that checks whether the compiler supports the
+# quadruple precision floating point math
+#
+# Sets the following variables:
+# QUADMATH_FOUND
+# QUADMATH_LIBRARIES
+#
+# perform tests
+include(CheckCSourceCompiles)
+include(CheckCXXSourceCompiles)
+include(CMakePushCheckState)
+include(CheckCXXCompilerFlag)
+
+if(NOT DEFINED USE_QUADMATH OR USE_QUADMATH)
+  if(NOT DEFINED HAVE_EXTENDED_NUMERIC_LITERALS)
+    check_cxx_compiler_flag("-Werror -fext-numeric-literals" HAVE_EXTENDED_NUMERIC_LITERALS)
+  endif()
+
+  if (HAVE_EXTENDED_NUMERIC_LITERALS)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fext-numeric-literals")
+  endif()
+
+  cmake_push_check_state(RESET)
+  list(APPEND CMAKE_REQUIRED_LIBRARIES "quadmath")
+  CHECK_CXX_SOURCE_COMPILES("
+#include <quadmath.h>
+
+int main(void){
+    __float128 foo = sqrtq(123.456);
+    foo = FLT128_MIN;
+}" QUADMATH_FOUND)
+  cmake_pop_check_state()
+
+  if (QUADMATH_FOUND)
+    set(QUADMATH_LIBRARIES "quadmath")
+    set(QUADMATH_FOUND "${QUADMATH_FOUND}")
+    set(HAVE_QUADMATH 1)
+  endif()
+endif()
+
+if (USE_QUADMATH AND NOT QUADMATH_FOUND)
+  message(FATAL_ERROR "Quadruple precision math support was explicitly requested but is unavailable!")
+endif()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Quadmath
+  DEFAULT_MSG
+  QUADMATH_LIBRARIES
+  QUADMATH_FOUND
+  )