CMake/Swig updates for Fedora Rawhide

[Richard Shaw <hobbes1069@xxxxxxxxx>]

libftdi was FTBFS[1] in Fedora Rawhide after a GCC 9.0.X mass rebuild but the problem turned out to be behavior changes[2] in CMake with regards to SWIG[3]. 

The UseSWIG module will now use standard target names and not generate the SWIG_MODULE_<target>_REAL_NAME variable.

I applied the following patch which appears to have solved the problem for now.

$ cat libftdi-cmake_swig.patch 

--- a/python/CMakeLists.txt

+++ b/python/CMakeLists.txt

@@ -1,3 +1,7 @@

+# swig_add_module is deprecated and SWIG_MODULE_<target>_REAL_NAME is no

+# longer set by default so set policy to the old behavior.

+cmake_policy(SET CMP0078 OLD)

+

 option ( PYTHON_BINDINGS "Build python bindings via swig" ON )

 option ( LINK_PYTHON_LIBRARY "Link against python libraries" ON )

 

@@ -24,8 +28,9 @@ if ( SWIG_FOUND AND PYTHONLIBS_FOUND AND

 

   if ( DOCUMENTATION AND DOXYGEN_FOUND )

     set(CMAKE_SWIG_FLAGS -DDOXYGEN=${DOXYGEN_FOUND})

+    set_property(SOURCE ftdi1.i PROPERTY DEPENDS ftdi1_doc.i)

   endif()

-  swig_add_module ( ftdi1 python ftdi1.i )

+  swig_add_library ( ftdi1 LANGUAGE python SOURCES ftdi1.i )

   swig_link_libraries ( ftdi1 ftdi1 )

 

   if ( LINK_PYTHON_LIBRARY )

---

Thanks,

Richard

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1675275

[2] https://cmake.org/cmake/help/latest/policy/CMP0078.html?highlight=cmp0078

[3] https://cmake.org/cmake/help/latest/module/UseSWIG.html

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