From c6a3fd0f2d331c5be951fdf5a0d63b7db3137ced Mon Sep 17 00:00:00 2001
From: Andrey Astafyev <dev@246060.ru>
Date: Sun, 2 Oct 2022 02:07:54 +0300
Subject: [PATCH] =?UTF-8?q?=D0=9D=D0=B0=D1=87=D0=B0=D0=BB=D0=BE?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 FindFFTW.cmake     | 449 +++++++++++++++++++++++++++++++++++++++++++++
 FindMathGL.cmake   |  51 +++++
 FindQuadmath.cmake |  54 ++++++
 README.md          |   8 +
 4 files changed, 562 insertions(+)
 create mode 100644 FindFFTW.cmake
 create mode 100644 FindMathGL.cmake
 create mode 100644 FindQuadmath.cmake
 create mode 100644 README.md

diff --git a/FindFFTW.cmake b/FindFFTW.cmake
new file mode 100644
index 0000000..78b1194
--- /dev/null
+++ b/FindFFTW.cmake
@@ -0,0 +1,449 @@
+# - Find the FFTW library
+#
+# Original version of this file:
+#   Copyright (c) 2015, Wenzel Jakob
+#   https://github.com/wjakob/layerlab/blob/master/cmake/FindFFTW.cmake, commit 4d58bfdc28891b4f9373dfe46239dda5a0b561c6
+# Modifications:
+#   Copyright (c) 2017, Patrick Bos
+#
+# Usage:
+#   find_package(FFTW [version] [REQUIRED] [QUIET] [COMPONENTS component1 ... componentX] )
+#
+# It sets the following variables:
+#   FFTW_FOUND                  ... true if fftw is found on the system
+#   FFTW_[component]_LIB_FOUND  ... true if the component is found on the system (see components below)
+#   FFTW_LIBRARIES              ... full paths to all found fftw libraries
+#   FFTW_[component]_LIB        ... full path to one of the components (see below)
+#   FFTW_INCLUDE_DIRS           ... fftw include directory paths
+#   FFTW_VERSION                ... fftw version found
+#
+# The following variables will be checked by the function
+#   FFTW_USE_STATIC_LIBS        ... if true, only static libraries are found, otherwise both static and shared.
+#   FFTW_ROOT                   ... if set, the libraries are exclusively searched
+#                                   under this path
+#
+# This package supports the following components:
+#   FLOAT_LIB
+#   DOUBLE_LIB
+#   LONGDOUBLE_LIB
+#   FLOAT_THREADS_LIB
+#   DOUBLE_THREADS_LIB
+#   LONGDOUBLE_THREADS_LIB
+#   FLOAT_OPENMP_LIB
+#   DOUBLE_OPENMP_LIB
+#   LONGDOUBLE_OPENMP_LIB
+#
+
+# TODO (maybe): extend with ExternalProject download + build option
+# TODO: put on conda-forge
+
+
+if( NOT FFTW_ROOT AND DEFINED ENV{FFTWDIR} )
+    set( FFTW_ROOT $ENV{FFTWDIR} )
+endif()
+
+# Check if we can use PkgConfig
+find_package(PkgConfig)
+
+#Determine from PKG
+if( PKG_CONFIG_FOUND AND NOT FFTW_ROOT )
+    pkg_check_modules( PKG_FFTW QUIET "fftw3" )
+endif()
+
+#Check whether to search static or dynamic libs
+set( CMAKE_FIND_LIBRARY_SUFFIXES_SAV ${CMAKE_FIND_LIBRARY_SUFFIXES} )
+
+if( ${FFTW_USE_STATIC_LIBS} )
+    set( CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_STATIC_LIBRARY_SUFFIX} )
+else()
+    set( CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES_SAV} )
+endif()
+
+if( FFTW_ROOT )
+    # find libs
+
+    find_library(
+        FFTW_DOUBLE_LIB
+        NAMES "fftw3" libfftw3-3
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    find_library(
+        FFTW_DOUBLE_THREADS_LIB
+        NAMES "fftw3_threads"
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    find_library(
+        FFTW_DOUBLE_OPENMP_LIB
+        NAMES "fftw3_omp"
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    find_library(
+        FFTW_DOUBLE_MPI_LIB
+        NAMES "fftw3_mpi"
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    find_library(
+        FFTW_FLOAT_LIB
+        NAMES "fftw3f" libfftw3f-3
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    find_library(
+        FFTW_FLOAT_THREADS_LIB
+        NAMES "fftw3f_threads"
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    find_library(
+        FFTW_FLOAT_OPENMP_LIB
+        NAMES "fftw3f_omp"
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    find_library(
+        FFTW_FLOAT_MPI_LIB
+        NAMES "fftw3f_mpi"
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    find_library(
+        FFTW_LONGDOUBLE_LIB
+        NAMES "fftw3l" libfftw3l-3
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    find_library(
+        FFTW_LONGDOUBLE_THREADS_LIB
+        NAMES "fftw3l_threads"
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    find_library(
+        FFTW_LONGDOUBLE_OPENMP_LIB
+        NAMES "fftw3l_omp"
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    find_library(
+        FFTW_LONGDOUBLE_MPI_LIB
+        NAMES "fftw3l_mpi"
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "lib" "lib64"
+        NO_DEFAULT_PATH
+        )
+
+    #find includes
+    find_path(FFTW_INCLUDE_DIRS
+        NAMES "fftw3.h"
+        PATHS ${FFTW_ROOT}
+        PATH_SUFFIXES "include"
+        NO_DEFAULT_PATH
+        )
+
+else()
+
+    find_library(
+        FFTW_DOUBLE_LIB
+        NAMES "fftw3"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_library(
+        FFTW_DOUBLE_THREADS_LIB
+        NAMES "fftw3_threads"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_library(
+        FFTW_DOUBLE_OPENMP_LIB
+        NAMES "fftw3_omp"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_library(
+        FFTW_DOUBLE_MPI_LIB
+        NAMES "fftw3_mpi"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_library(
+        FFTW_FLOAT_LIB
+        NAMES "fftw3f"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_library(
+        FFTW_FLOAT_THREADS_LIB
+        NAMES "fftw3f_threads"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_library(
+        FFTW_FLOAT_OPENMP_LIB
+        NAMES "fftw3f_omp"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_library(
+        FFTW_FLOAT_MPI_LIB
+        NAMES "fftw3f_mpi"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_library(
+        FFTW_LONGDOUBLE_LIB
+        NAMES "fftw3l"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_library(
+        FFTW_LONGDOUBLE_THREADS_LIB
+        NAMES "fftw3l_threads"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_library(FFTW_LONGDOUBLE_OPENMP_LIB
+        NAMES "fftw3l_omp"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_library(FFTW_LONGDOUBLE_MPI_LIB
+        NAMES "fftw3l_mpi"
+        PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
+        )
+
+    find_path(FFTW_INCLUDE_DIRS
+        NAMES "fftw3.h"
+        PATHS ${PKG_FFTW_INCLUDE_DIRS} ${INCLUDE_INSTALL_DIR}
+        )
+
+endif( FFTW_ROOT )
+
+#--------------------------------------- components
+
+if (FFTW_DOUBLE_LIB)
+    set(FFTW_DOUBLE_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_DOUBLE_LIB})
+    add_library(FFTW::Double INTERFACE IMPORTED)
+    set_target_properties(FFTW::Double
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_DOUBLE_LIB}"
+        )
+else()
+    set(FFTW_DOUBLE_LIB_FOUND FALSE)
+endif()
+
+if (FFTW_FLOAT_LIB)
+    set(FFTW_FLOAT_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_FLOAT_LIB})
+    add_library(FFTW::Float INTERFACE IMPORTED)
+    set_target_properties(FFTW::Float
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_FLOAT_LIB}"
+        )
+else()
+    set(FFTW_FLOAT_LIB_FOUND FALSE)
+endif()
+
+if (FFTW_LONGDOUBLE_LIB)
+    set(FFTW_LONGDOUBLE_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_LONGDOUBLE_LIB})
+    add_library(FFTW::LongDouble INTERFACE IMPORTED)
+    set_target_properties(FFTW::LongDouble
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_LONGDOUBLE_LIB}"
+        )
+else()
+    set(FFTW_LONGDOUBLE_LIB_FOUND FALSE)
+endif()
+
+if (FFTW_DOUBLE_THREADS_LIB)
+    set(FFTW_DOUBLE_THREADS_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_DOUBLE_THREADS_LIB})
+    add_library(FFTW::DoubleThreads INTERFACE IMPORTED)
+    set_target_properties(FFTW::DoubleThreads
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_DOUBLE_THREADS_LIB}"
+        )
+else()
+    set(FFTW_DOUBLE_THREADS_LIB_FOUND FALSE)
+endif()
+
+if (FFTW_FLOAT_THREADS_LIB)
+    set(FFTW_FLOAT_THREADS_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_FLOAT_THREADS_LIB})
+    add_library(FFTW::FloatThreads INTERFACE IMPORTED)
+    set_target_properties(FFTW::FloatThreads
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_FLOAT_THREADS_LIB}"
+        )
+else()
+    set(FFTW_FLOAT_THREADS_LIB_FOUND FALSE)
+endif()
+
+if (FFTW_LONGDOUBLE_THREADS_LIB)
+    set(FFTW_LONGDOUBLE_THREADS_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_LONGDOUBLE_THREADS_LIB})
+    add_library(FFTW::LongDoubleThreads INTERFACE IMPORTED)
+    set_target_properties(FFTW::LongDoubleThreads
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_LONGDOUBLE_THREADS_LIB}"
+        )
+else()
+    set(FFTW_LONGDOUBLE_THREADS_LIB_FOUND FALSE)
+endif()
+
+if (FFTW_DOUBLE_OPENMP_LIB)
+    set(FFTW_DOUBLE_OPENMP_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_DOUBLE_OPENMP_LIB})
+    add_library(FFTW::DoubleOpenMP INTERFACE IMPORTED)
+    set_target_properties(FFTW::DoubleOpenMP
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_DOUBLE_OPENMP_LIB}"
+        )
+else()
+    set(FFTW_DOUBLE_OPENMP_LIB_FOUND FALSE)
+endif()
+
+if (FFTW_FLOAT_OPENMP_LIB)
+    set(FFTW_FLOAT_OPENMP_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_FLOAT_OPENMP_LIB})
+    add_library(FFTW::FloatOpenMP INTERFACE IMPORTED)
+    set_target_properties(FFTW::FloatOpenMP
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_FLOAT_OPENMP_LIB}"
+        )
+else()
+    set(FFTW_FLOAT_OPENMP_LIB_FOUND FALSE)
+endif()
+
+if (FFTW_LONGDOUBLE_OPENMP_LIB)
+    set(FFTW_LONGDOUBLE_OPENMP_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_LONGDOUBLE_OPENMP_LIB})
+    add_library(FFTW::LongDoubleOpenMP INTERFACE IMPORTED)
+    set_target_properties(FFTW::LongDoubleOpenMP
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_LONGDOUBLE_OPENMP_LIB}"
+        )
+else()
+    set(FFTW_LONGDOUBLE_OPENMP_LIB_FOUND FALSE)
+endif()
+
+if (FFTW_DOUBLE_MPI_LIB)
+    set(FFTW_DOUBLE_MPI_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_DOUBLE_MPI_LIB})
+    add_library(FFTW::DoubleMPI INTERFACE IMPORTED)
+    set_target_properties(FFTW::DoubleMPI
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_DOUBLE_MPI_LIB}"
+        )
+else()
+    set(FFTW_DOUBLE_MPI_LIB_FOUND FALSE)
+endif()
+
+if (FFTW_FLOAT_MPI_LIB)
+    set(FFTW_FLOAT_MPI_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_FLOAT_MPI_LIB})
+    add_library(FFTW::FloatMPI INTERFACE IMPORTED)
+    set_target_properties(FFTW::FloatMPI
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_FLOAT_MPI_LIB}"
+        )
+else()
+    set(FFTW_FLOAT_MPI_LIB_FOUND FALSE)
+endif()
+
+if (FFTW_LONGDOUBLE_MPI_LIB)
+    set(FFTW_LONGDOUBLE_MPI_LIB_FOUND TRUE)
+    set(FFTW_LIBRARIES ${FFTW_LIBRARIES} ${FFTW_LONGDOUBLE_MPI_LIB})
+    add_library(FFTW::LongDoubleMPI INTERFACE IMPORTED)
+    set_target_properties(FFTW::LongDoubleMPI
+        PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIRS}"
+        INTERFACE_LINK_LIBRARIES "${FFTW_LONGDOUBLE_MPI_LIB}"
+        )
+else()
+    set(FFTW_LONGDOUBLE_MPI_LIB_FOUND FALSE)
+endif()
+
+#--------------------------------------- end components
+
+set( CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES_SAV} )
+
+# Deduce the version
+execute_process(COMMAND fftw-wisdom-to-conf -V
+                RESULT_VARIABLE success
+                OUTPUT_VARIABLE stdout
+                ERROR_VARIABLE stderr)
+if (success EQUAL 0)
+    string(REGEX MATCH "FFTW *version *([0-9]+([.][0-9]+([.][0-9]+)?)?)"
+            _version ${stdout}
+           )
+    string(REPLACE " " ";" _version_list ${_version})
+    list(GET _version_list -1 FFTW_VERSION)
+    set(_version_list)
+    set(_version)
+else()
+    message("Error running fftw-wisdom-to-conf. Could not determine FFTW version
+Output:
+${stdout}
+
+Error:
+${stderr}
+")
+    set(FFTW_VERSION)
+endif()
+set(stdout)
+set(stderr)
+set(success)
+
+include(FindPackageHandleStandardArgs)
+
+find_package_handle_standard_args(FFTW
+    REQUIRED_VARS FFTW_INCLUDE_DIRS
+    VERSION_VAR FFTW_VERSION
+    HANDLE_COMPONENTS
+    )
+
+mark_as_advanced(
+    FFTW_INCLUDE_DIRS
+    FFTW_LIBRARIES
+    FFTW_FLOAT_LIB
+    FFTW_DOUBLE_LIB
+    FFTW_LONGDOUBLE_LIB
+    FFTW_FLOAT_THREADS_LIB
+    FFTW_DOUBLE_THREADS_LIB
+    FFTW_LONGDOUBLE_THREADS_LIB
+    FFTW_FLOAT_OPENMP_LIB
+    FFTW_DOUBLE_OPENMP_LIB
+    FFTW_LONGDOUBLE_OPENMP_LIB
+    FFTW_FLOAT_MPI_LIB
+    FFTW_DOUBLE_MPI_LIB
+    FFTW_LONGDOUBLE_MPI_LIB
+    FFTW_VERSION
+    )
diff --git a/FindMathGL.cmake b/FindMathGL.cmake
new file mode 100644
index 0000000..ee5a2e0
--- /dev/null
+++ b/FindMathGL.cmake
@@ -0,0 +1,51 @@
+set(MATHGL_PREFIX "" CACHE PATH "The path to the prefix of an MathGL installation")
+
+find_path(MATHGL_INCLUDE_DIR NAMES mgl2/mgl.h
+  PATHS
+  ${MATHGL_PREFIX}/include
+  /opt/local/include
+  /usr/include
+  /usr/local/include
+  )
+
+find_library(MATHGL_LIBRARIES NAMES mgl mgl2
+  PATHS
+  ${MATHGL_PREFIX}/lib
+  /opt/local/include
+  /usr/include
+  /usr/local/include
+  )
+
+find_library(MATHGL_QT5_LIBRARIES NAMES mgl-qt5 mgl2-qt5
+  PATHS
+  ${MATHGL_PREFIX}/lib
+  /opt/local/include
+  /usr/include
+  /usr/local/include
+  )
+
+if(MATHGL_INCLUDE_DIR AND MATHGL_LIBRARIES)
+  get_filename_component(MATHGL_LIBRARY_DIR ${MATHGL_LIBRARIES} PATH)
+  set(MATHGL_FOUND TRUE)
+  add_library(MathGL::Mgl INTERFACE IMPORTED)
+  set_target_properties(MathGL::Mgl PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${MATHGL_INCLUDE_DIR}"
+      INTERFACE_LINK_LIBRARIES "${MATHGL_LIBRARIES}"
+  )
+  add_library(MathGL::Qt5 INTERFACE IMPORTED)
+  set_target_properties(MathGL::Qt5 PROPERTIES
+    INTERFACE_INCLUDE_DIRECTORIES "${MATHGL_INCLUDE_DIR}"
+    INTERFACE_LINK_LIBRARIES "${MATHGL_QT5_LIBRARIES}"
+)
+endif()
+
+if(MATHGL_FOUND)
+  if(NOT MATHGL_FIND_QUIETLY)
+    MESSAGE(STATUS "Found MathGL: ${MATHGL_LIBRARIES}")
+  endif()
+  set(HAVE_MATHGL 1)
+elseif(MATHGL_FOUND)
+  if(MATHGL_FIND_REQUIRED)
+    message(FATAL_ERROR "Could not find MATHGL")
+  endif()
+endif()
diff --git a/FindQuadmath.cmake b/FindQuadmath.cmake
new file mode 100644
index 0000000..50f06b7
--- /dev/null
+++ b/FindQuadmath.cmake
@@ -0,0 +1,54 @@
+# Module that checks whether the compiler supports the
+# quadruple precision floating point math
+#
+# Sets the following variables:
+# HAVE_QUAD
+# QUADMATH_LIBRARIES
+#
+# perform tests
+include(CheckCSourceCompiles)
+include(CheckCXXSourceCompiles)
+include(CMakePushCheckState)
+include(CheckCXXCompilerFlag)
+
+if(NOT DEFINED USE_QUADMATH OR USE_QUADMATH)
+  if(NOT DEFINED HAVE_EXTENDED_NUMERIC_LITERALS)
+    check_cxx_compiler_flag("-Werror -fext-numeric-literals" HAVE_EXTENDED_NUMERIC_LITERALS)
+  endif()
+
+  if (HAVE_EXTENDED_NUMERIC_LITERALS)
+    set(CMAKE_CXX_FLAGS "${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(HAVE_QUAD "${QUADMATH_FOUND}")
+    add_library(QuadMath::QuadMath INTERFACE IMPORTED)
+    set_target_properties(QuadMath::QuadMath PROPERTIES
+      INTERFACE_LINK_LIBRARIES quadmath
+      INTERFACE_COMPILE_DEFINITIONS _GLIBCXX_USE_FLOAT128
+      INTERFACE_COMPILE_OPTIONS $<$<CXX_COMPILER_ID:GNU>:-fext-numeric-literals>)
+  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
+  )
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..870b527
--- /dev/null
+++ b/README.md
@@ -0,0 +1,8 @@
+# Модули поиска для CMake
+
+Репозиторий модулей для поиска программ и библиотек.
+Для использования необходимо поместить нужный модуль
+в каталог, указанный в переменной `CMAKE_MODULES_PATH`.
+
+В проектах, использующих библиотеку [`myx`](../myx),
+для модулей поиска предназначен каталог `cmake/find`.