Adding FindFlann.cmake

cmake/FindFlann.cmake

+###############################################################################
+# Find Flann
+#
+# This sets the following variables:
+# FLANN_FOUND - True if FLANN was found.
+# FLANN_INCLUDE_DIRS - Directories containing the FLANN include files.
+# FLANN_LIBRARIES - Libraries needed to use FLANN.
+# FLANN_DEFINITIONS - Compiler flags for FLANN.
+
+find_package(PkgConfig)
+pkg_check_modules(PC_FLANN flann)
+set(FLANN_DEFINITIONS ${PC_FLANN_CFLAGS_OTHER})
+
+find_path(FLANN_INCLUDE_DIR flann/flann.hpp
+    HINTS ${PC_FLANN_INCLUDEDIR} ${PC_FLANN_INCLUDE_DIRS})
+
+find_library(FLANN_LIBRARY flann
+    HINTS ${PC_FLANN_LIBDIR} ${PC_FLANN_LIBRARY_DIRS})
+
+set(FLANN_INCLUDE_DIRS ${FLANN_INCLUDE_DIR})
+set(FLANN_LIBRARIES ${FLANN_LIBRARY})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Flann DEFAULT_MSG
+    FLANN_LIBRARY FLANN_INCLUDE_DIR)
+
+mark_as_advanced(FLANN_LIBRARY FLANN_INCLUDE_DIR)
+