> Date: Sun, 13 Jan 2013 20:28:10 +0800
> Subject: Re: Warning in Python wrapper
> From: xiaofanc@xxxxxxxxx
> To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
>
> On Sun, Jan 13, 2013 at 11:44 AM, Matthias Janke
> <matthias.janke@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> > Hi all,
> >
> > compiling (gcc 4.7.2) the python wrapper leads to the following warning:
> >
> > libftdi/build/bindings/ftdi1PYTHON_wrap.c: In function
> > 'SWIG_InitializeModule':
> > libftdi/build/bindings/ftdi1PYTHON_wrap.c:12294:3: warning: statement
> > with no effect [-Wunused-value]
> >
> > is this harmless?
> >
>
> I got similar warnings under Linux. It seems to be harmless.
>
> But I got problems under Mac OS X with the Python wrapper.
>
> 1) Under Linux; Ubuntu 12.10
> mcuee@Ubuntu1210VM:~/Desktop/build/libftdi/libftdi/build$ make
> [ 4%] Generating doc/html/index.html
> warning: Tag `SHOW_DIRECTORIES' at line 519 of file
> /home/mcuee/Desktop/build/libftdi/libftdi/build/Doxyfile has become
> obsolete.
> To avoid this warning please remove this line from your configuration
> file or upgrade it using "doxygen -u"
> warning: Tag `HTML_ALIGN_MEMBERS' at line 906 of file
> /home/mcuee/Desktop/build/libftdi/libftdi/build/Doxyfile has become
> obsolete.
> To avoid this warning please remove this line from your configuration
> file or upgrade it using "doxygen -u"
> warning: Tag `USE_INLINE_TREES' at line 1093 of file
> /home/mcuee/Desktop/build/libftdi/libftdi/build/Doxyfile has become
> obsolete.
> To avoid this warning please remove this line from your configuration
> file or upgrade it using "doxygen -u"
> [ 4%] Built target docs
> [ 8%] Building C object src/CMakeFiles/ftdi1.dir/ftdi.c.o
> [ 12%] Building C object src/CMakeFiles/ftdi1.dir/ftdi_stream.c.o
> Linking C shared library libftdi1.so
> [ 12%] Built target ftdi1
> [ 16%] Building C object src/CMakeFiles/ftdi1-static.dir/ftdi.c.o
> [ 20%] Building C object src/CMakeFiles/ftdi1-static.dir/ftdi_stream.c.o
> Linking C static library libftdi1.a
> [ 20%] Built target ftdi1-static
> [ 24%] Building CXX object ftdipp/CMakeFiles/ftdipp1.dir/ftdi.cpp.o
> Linking CXX shared library libftdipp1.so
> [ 24%] Built target ftdipp1
> [ 28%] Building CXX object ftdipp/CMakeFiles/ftdipp1-static.dir/ftdi.cpp.o
> Linking CXX static library libftdipp1.a
> [ 28%] Built target ftdipp1-static
> [ 32%] Generating ../doc/xml/ftdi_8c.xml
> warning: Tag `SHOW_DIRECTORIES' at line 523 of file Doxyfile has
> become obsolete.
> To avoid this warning please remove this line from your configuration
> file or upgrade it using "doxygen -u"
> warning: Tag `HTML_ALIGN_MEMBERS' at line 910 of file Doxyfile has
> become obsolete.
> To avoid this warning please remove this line from your configuration
> file or upgrade it using "doxygen -u"
> warning: Tag `USE_INLINE_TREES' at line 1097 of file Doxyfile has
> become obsolete.
> To avoid this warning please remove this line from your configuration
> file or upgrade it using "doxygen -u"
> [ 32%] Built target doc_xml
> [ 36%] Generating ftdi1_doc.i
> [ 40%] Swig source
> [ 44%] Building C object bindings/CMakeFiles/_ftdi1.dir/ftdi1PYTHON_wrap.c.o
> /home/mcuee/Desktop/build/libftdi/libftdi/build/bindings/ftdi1PYTHON_wrap.c:
> In function ‘init_ftdi1’:
> /home/mcuee/Desktop/build/libftdi/libftdi/build/bindings/ftdi1PYTHON_wrap.c:12789:21:
> warning: variable ‘md’ set but not used [-Wunused-but-set-variable]
> Linking C shared module _ftdi1.so
> [ 44%] Built target _ftdi1
> [ 48%] Building C object ftdi_eeprom/CMakeFiles/ftdi_eeprom.dir/main.c.o
> Linking C executable ftdi_eeprom
> [ 48%] Built target ftdi_eeprom
> [ 52%] Building C object examples/CMakeFiles/baud_test.dir/baud_test.c.o
> Linking C executable baud_test
> [ 52%] Built target baud_test
> [ 56%] Building C object examples/CMakeFiles/bitbang.dir/bitbang.c.o
> Linking C executable bitbang
> [ 56%] Built target bitbang
> [ 60%] Building C object examples/CMakeFiles/bitbang2.dir/bitbang2.c.o
> Linking C executable bitbang2
> [ 60%] Built target bitbang2
> [ 64%] Building C object examples/CMakeFiles/bitbang_cbus.dir/bitbang_cbus.c.o
> /home/mcuee/Desktop/build/libftdi/libftdi/examples/bitbang_cbus.c: In
> function ‘main’:
> /home/mcuee/Desktop/build/libftdi/libftdi/examples/bitbang_cbus.c:63:14:
> warning: ignoring return value of ‘fgets’, declared with attribute
> warn_unused_result [-Wunused-result]
> Linking C executable bitbang_cbus
> [ 64%] Built target bitbang_cbus
> [ 68%] Building C object
> examples/CMakeFiles/bitbang_ft2232.dir/bitbang_ft2232.c.o
> Linking C executable bitbang_ft2232
> [ 68%] Built target bitbang_ft2232
> [ 72%] Building C object examples/CMakeFiles/eeprom.dir/eeprom.c.o
> Linking C executable eeprom
> [ 72%] Built target eeprom
> [ 76%] Building C object examples/CMakeFiles/find_all.dir/find_all.c.o
> Linking C executable find_all
> [ 76%] Built target find_all
> [ 80%] Building CXX object examples/CMakeFiles/find_all_pp.dir/find_all_pp.cpp.o
> Linking CXX executable find_all_pp
> [ 80%] Built target find_all_pp
> [ 84%] Building C object examples/CMakeFiles/serial_test.dir/serial_test.c.o
> Linking C executable serial_test
> [ 84%] Built target serial_test
> [ 88%] Building C object examples/CMakeFiles/simple.dir/simple.c.o
> Linking C executable simple
> [ 88%] Built target simple
> [ 92%] Building C object examples/CMakeFiles/stream_test.dir/stream_test.c.o
> Linking C executable stream_test
> [ 92%] Built target stream_test
> [ 96%] Building CXX object test/CMakeFiles/test_libftdi1.dir/basic.cpp.o
> [100%] Building CXX object test/CMakeFiles/test_libftdi1.dir/baudrate.cpp.o
> Linking CXX executable test_libftdi1
> [100%] Built target test_libftdi1
>
>
> 2) Under Mac OS X, it failed to build (using Homebrew and Apple
> XCode Compiler). I am not so sure where the problem is.
>
> [ 40%] Swig source
> Scanning dependencies of target _ftdi1
> [ 44%] Building C object bindings/CMakeFiles/_ftdi1.dir/ftdi1PYTHON_wrap.c.o
> /Users/xiaofanc/work/libftdi/libftdi/build/bindings/ftdi1PYTHON_wrap.c:2366:23:
> warning:
> explicitly assigning a variable of type 'int' to itself [-Wself-assign]
> res = SWIG_AddCast(res);
> ~~~ ^ ~~~
> /Users/xiaofanc/work/libftdi/libftdi/build/bindings/ftdi1PYTHON_wrap.c:2369:23:
> warning:
> explicitly assigning a variable of type 'int' to itself [-Wself-assign]
> res = SWIG_AddCast(res);
> ~~~ ^ ~~~
> 2 warnings generated.
> Linking C shared module _ftdi1.so
> Undefined symbols for architecture x86_64:
> "_convertString", referenced from:
> __wrap_read_data in ftdi1PYTHON_wrap.c.o
> __wrap_get_eeprom_buf in ftdi1PYTHON_wrap.c.o
> ld: symbol(s) not found for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to see invocation)
> make[2]: *** [bindings/_ftdi1.so] Error 1
> make[1]: *** [bindings/CMakeFiles/_ftdi1.dir/all] Error 2
> make: *** [all] Error 2
>
>
> --
> Xiaofan
>
OMG you're right it's broken.
Here is a patch.
And another to fix python3 build.
