Replace swig with pybind11 for gr3.9 master compat

Signed-off-by: Eric Wild <ewild@sysmocom.de>

CMakeLists.txt

@@ -41,7 +41,7 @@ set(CMAKE_BUILD_TYPE ${CMAKE_BUILD_TYPE} CACHE STRING "")
 list(INSERT CMAKE_MODULE_PATH 0 ${CMAKE_SOURCE_DIR}/cmake/Modules)
 
 # Find GNURadio (pmt and runtime are core, always included)
-find_package(Gnuradio "3.8" REQUIRED COMPONENTS blocks fft filter)
+find_package(Gnuradio "3.9" REQUIRED COMPONENTS blocks fft filter)
 
 # Set the version information here
 set(VERSION_MAJOR 0)
@@ -188,20 +188,11 @@ find_package(Doxygen)
     ##########
 
 find_package(PythonLibs 3)
-find_package(SWIG)
-
-if(SWIG_FOUND)
-    message(STATUS "Minimum SWIG version required is 1.3.31")
-    set(SWIG_VERSION_CHECK FALSE)
-    if("${SWIG_VERSION}" VERSION_GREATER "1.3.30")
-        set(SWIG_VERSION_CHECK TRUE)
-    endif()
-endif(SWIG_FOUND)
+find_package(pybind11)
 
 GR_REGISTER_COMPONENT("Python support" ENABLE_PYTHON
     PYTHONLIBS_FOUND
-    SWIG_FOUND
-    SWIG_VERSION_CHECK
+    pybind11_FOUND
 )
 
 ########################################################################
@@ -269,7 +260,6 @@ add_custom_target(uninstall
 add_subdirectory(include/osmosdr)
 add_subdirectory(lib)
 if(ENABLE_PYTHON)
-    add_subdirectory(swig)
     add_subdirectory(python)
     add_subdirectory(grc)
     add_subdirectory(apps)

docs/doxygen/pydoc_macros.h

@@ -0,0 +1,19 @@
+#ifndef PYDOC_MACROS_H
+#define PYDOC_MACROS_H
+
+#define __EXPAND(x) x
+#define __COUNT(_1, _2, _3, _4, _5, _6, _7, COUNT, ...) COUNT
+#define __VA_SIZE(...) __EXPAND(__COUNT(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1))
+#define __CAT1(a, b) a##b
+#define __CAT2(a, b) __CAT1(a, b)
+#define __DOC1(n1) __doc_##n1
+#define __DOC2(n1, n2) __doc_##n1##_##n2
+#define __DOC3(n1, n2, n3) __doc_##n1##_##n2##_##n3
+#define __DOC4(n1, n2, n3, n4) __doc_##n1##_##n2##_##n3##_##n4
+#define __DOC5(n1, n2, n3, n4, n5) __doc_##n1##_##n2##_##n3##_##n4##_##n5
+#define __DOC6(n1, n2, n3, n4, n5, n6) __doc_##n1##_##n2##_##n3##_##n4##_##n5##_##n6
+#define __DOC7(n1, n2, n3, n4, n5, n6, n7) \
+    __doc_##n1##_##n2##_##n3##_##n4##_##n5##_##n6##_##n7
+#define DOC(...) __EXPAND(__EXPAND(__CAT2(__DOC, __VA_SIZE(__VA_ARGS__)))(__VA_ARGS__))
+
+#endif // PYDOC_MACROS_H