cmake: Update UHDPython.cmake

- Use find_package(pybind11) to find a system-wide Pybind11. This will
  take preference over the vendored version of Pybind11, unless
  requested otherwise.
- Fix a typo.

host/CMakeLists.txt

@@ -40,6 +40,7 @@ set(NUMPY_MIN_VERSION "1.11")
 set(RUAMEL.YAML_MIN_VERSION "0.15")
 set(PY_MAKO_MIN_VERSION "0.4.2")
 set(PY_REQUESTS_MIN_VERSION "2.0")
+set(PYBIND11_MIN_VERSION "2.4")
 
 ########################################################################
 # Check Compiler Version

host/cmake/Modules/UHDPython.cmake

@@ -17,6 +17,14 @@ endif()
 if(NOT DEFINED INCLUDED_UHD_PYTHON_CMAKE)
 set(INCLUDED_UHD_PYTHON_CMAKE TRUE)
 
+########################################################################
+# Setup Python Part 0: Pybind11
+#
+# We do this first so it doesn't interfere with the other steps. In
+# particular, searching for pybind11 will mess with PYTHON_VERSION.
+########################################################################
+find_package(pybind11 ${PYBIND11_MIN_VERSION} QUIET)
+
 ########################################################################
 # Setup Python Part 1: Find the interpreters
 ########################################################################
@@ -211,7 +219,7 @@ exit(0)
     )
     if(python_result EQUAL 0)
         if(${version_output} VERSION_GREATER_EQUAL ${min_module_version})
-            message(STATUS "Python checking for ${desc} - ${version_output} satisifes minimum required version ${min_module_version}")
+            message(STATUS "Python checking for ${desc} - ${version_output} satisfies minimum required version ${min_module_version}")
             set(${have_var} TRUE)
         else()
             message(STATUS "Python checking for ${desc} - ${version_output} does not satisfy minimum required version ${min_module_version}")

host/cmake/debian/control

@@ -22,7 +22,8 @@ Build-Depends: cmake,
                python3-numpy,
                python3-requests,
                python3-ruamel.yaml,
-               python3-setuptools
+               python3-setuptools,
+               pybind11-dev
 Build-Depends-Indep: doxygen,
               	     doxygen-latex,
                	     graphviz [!powerpcspe]

host/python/CMakeLists.txt

@@ -4,10 +4,6 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 #
 
-########################################################################
-# This file included, use CMake directory variables
-########################################################################
-
 PYTHON_CHECK_MODULE(
     "virtual environment"
     "sys"
@@ -15,15 +11,18 @@ PYTHON_CHECK_MODULE(
     HAVE_PYTHON_VIRTUALENV
 )
 
+if(pybind11_FOUND)
+  message(STATUS "Using Pybind11 from: ${pybind11_INCLUDE_DIR}")
+else()
+  set(pybind11_INCLUDE_DIR
+      "${UHD_SOURCE_DIR}/lib/deps/pybind11/include"
+      CACHE STRING
+      "Location of PyBind11 includes"
+  )
+  message(STATUS "Using in-tree Pybind11.")
+endif()
+
 # Get include dirs
-include_directories(${PYTHON_INCLUDE_DIRS})
-set(PYBIND11_INCLUDE_DIR
-    "${UHD_SOURCE_DIR}/lib/deps/pybind11/include"
-    CACHE
-    STRING
-    "Location of PyBind11 includes"
-)
-include_directories(${PYBIND11_INCLUDE_DIR})
 execute_process(
     COMMAND "${PYTHON_EXECUTABLE}" -c
     "try:\n import numpy\n import os\n inc_path = numpy.get_include()\n if os.path.exists(os.path.join(inc_path, 'numpy', 'arrayobject.h')):\n  print(inc_path, end='')\nexcept:\n pass"
@@ -36,6 +35,7 @@ add_library(pyuhd SHARED
     ${UHD_SOURCE_DIR}/lib/device_python.cpp
     ${UHD_SOURCE_DIR}/lib/usrp/multi_usrp_python.cpp
 )
+
 # python expects extension modules with a particular suffix
 if(WIN32)
     set_target_properties(pyuhd PROPERTIES PREFIX "lib" SUFFIX ".pyd")
@@ -56,9 +56,10 @@ else()
     )
 endif(WIN32)
 target_include_directories(pyuhd PUBLIC
+    ${PYTHON_INCLUDE_DIRS}
     ${PYTHON_NUMPY_INCLUDE_DIR}
     ${UHD_SOURCE_DIR}/lib
-    ${PYBIND11_INCLUDE_DIR}
+    ${pybind11_INCLUDE_DIR}
 )
 
 if(WIN32)