add CMakeLists.txt and necessary modules

cmake/Modules/FindPThreads_windows.cmake

@@ -0,0 +1,75 @@
+# Distributed under the OSI-approved BSD 3-Clause License.
+# Copyright Stefano Sinigardi
+
+#.rst:
+# FindPThreads
+# ------------
+#
+# Find the PThreads includes and library.
+#
+# Result Variables
+# ^^^^^^^^^^^^^^^^
+#
+# This module defines the following variables:
+#
+# ``PTHREADS_FOUND``
+#   True if PThreads library found
+#
+# ``PTHREADS_INCLUDE_DIR``
+#   Location of PThreads headers
+#
+# ``PTHREADS_LIBRARY``
+#   List of libraries to link with when using PThreads
+#
+
+include(${CMAKE_ROOT}/Modules/FindPackageHandleStandardArgs.cmake)
+include(${CMAKE_ROOT}/Modules/SelectLibraryConfigurations.cmake)
+
+find_path(PTHREADS_INCLUDE_DIR NAMES pthread.h)
+
+# Allow libraries to be set manually
+if(NOT PTHREADS_LIBRARY)
+  find_library(PTHREADS_LIBRARY_RELEASE NAMES pthreadsVC2)
+  find_library(PTHREADS_LIBRARY_DEBUG NAMES pthreadsVC2d)
+  select_library_configurations(PTHREADS)
+endif()
+
+find_package_handle_standard_args(PTHREADS DEFAULT_MSG PTHREADS_LIBRARY PTHREADS_INCLUDE_DIR)
+mark_as_advanced(PTHREADS_INCLUDE_DIR PTHREADS_LIBRARY)
+
+
+# Register imported libraries:
+# 1. If we can find a Windows .dll file (or if we can find both Debug and
+#    Release libraries), we will set appropriate target properties for these.
+# 2. However, for most systems, we will only register the import location and
+#    include directory.
+
+# Look for dlls, for Release and Debug libraries.
+if(WIN32)
+  string( REPLACE ".lib" ".dll" PTHREADS_LIBRARY_RELEASE_DLL "${PTHREADS_LIBRARY_RELEASE}" )
+  string( REPLACE ".lib" ".dll" PTHREADS_LIBRARY_DEBUG_DLL   "${PTHREADS_LIBRARY_DEBUG}" )
+endif()
+
+if( PTHREADS_FOUND AND NOT TARGET PThreads::PThreads )
+  if( EXISTS "${PTHREADS_LIBRARY_RELEASE_DLL}" )
+    add_library( PThreads::PThreads      SHARED IMPORTED )
+    set_target_properties( PThreads::PThreads PROPERTIES
+      IMPORTED_LOCATION_RELEASE         "${PTHREADS_LIBRARY_RELEASE_DLL}"
+      IMPORTED_IMPLIB                   "${PTHREADS_LIBRARY_RELEASE}"
+      INTERFACE_INCLUDE_DIRECTORIES     "${PTHREADS_INCLUDE_DIR}"
+      IMPORTED_CONFIGURATIONS           Release
+      IMPORTED_LINK_INTERFACE_LANGUAGES "C" )
+    if( EXISTS "${PTHREADS_LIBRARY_DEBUG_DLL}" )
+      set_property( TARGET PThreads::PThreads APPEND PROPERTY IMPORTED_CONFIGURATIONS Debug )
+      set_target_properties( FFTW::fftw3 PROPERTIES
+        IMPORTED_LOCATION_DEBUG           "${PTHREADS_LIBRARY_DEBUG_DLL}"
+        IMPORTED_IMPLIB_DEBUG             "${PTHREADS_LIBRARY_DEBUG}" )
+    endif()
+  else()
+    add_library( PThreads::PThreads      UNKNOWN IMPORTED )
+    set_target_properties( PThreads::PThreads PROPERTIES
+      IMPORTED_LOCATION                 "${PTHREADS_LIBRARY}"
+      INTERFACE_INCLUDE_DIRECTORIES     "${PTHREADS_INCLUDE_DIR}"
+      IMPORTED_LINK_INTERFACE_LANGUAGES "C" )
+  endif()
+endif()