Compile error on Ubuntu 12.10

[danopia]

I'm trying to compile this gem on a friend's 64-bit bedside box for my ambient light and movement sensing scripts but I'm getting compile errors no matter what I try (from source or from gem, and both 1.8 and 1.9.1).

This gem is working beautifully on my 12.04 bedside box so I assume that it's the new version of Ubuntu messing with things.

Install log:

media@ClockBook:~$ sudo gem1.9.1 install hornetseye-v4l2
Building native extensions.  This could take a while...
ERROR:  Error installing hornetseye-v4l2:
    ERROR: Failed to build gem native extension.

        rake1.9.1 RUBYARCHDIR=/var/lib/gems/1.9.1/gems/hornetseye-v4l2-1.0.1/lib RUBYLIBDIR=/var/lib/gems/1.9.1/gems/hornetseye-v4l2-1.0.1/lib
Please install 'yard' if you want to generate documentation
g++ -MM ext/v4l2input.cc ext/init.cc ext/v4l2select.cc ext/frame.cc | sed -e :a -e N -e 's/\n/\$/g' -e ta | sed -e 's/ *\\\$ */ /g' -e 's/\$/\n/g' | sed -e 's/^/ext\//' > .depends.mf
g++ -DNDEBUG -D_FORTIFY_SOURCE=2  -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall -fno-strict-aliasing -fPIC -I/usr/include/ruby-1.9.1 -I/usr/include/ruby-1.9.1/x86_64-linux -c -o ext/v4l2input.o ext/v4l2input.cc
ext/v4l2input.cc: In constructor ‘V4L2Input::V4L2Input(const string&, int, V4L2SelectPtr)’:
ext/v4l2input.cc:59:5: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses]
ext/v4l2input.cc: In member function ‘v4l2_ctrl_type V4L2Input::featureType(unsigned int)’:
ext/v4l2input.cc:346:20: error: invalid conversion from ‘__u32 {aka unsigned int}’ to ‘v4l2_ctrl_type’ [-fpermissive]
rake aborted!
Command failed with status (1): [g++ -DNDEBUG -D_FORTIFY_SOURCE=2  -D_FORTI...]

Tasks: TOP => default => all => ext/hornetseye_v4l2.so => ext/v4l2input.o
(See full trace by running task with --trace)


Gem files will remain installed in /var/lib/gems/1.9.1/gems/hornetseye-v4l2-1.0.1 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/hornetseye-v4l2-1.0.1/./gem_make.out
media@ClockBook:~$ 

[wedesoft]

I added an explicit conversion to 'v4l2_ctr_type' and released version 1.0.2. I hope it will work for you now (myself I am still using Kubuntu 12.04).

[danopia]

This solves the issue. Just for reference I'm using gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1).

Thanks, now I can get additional boxes up for my friends ^.^

[wedesoft]

Ok, cool. Thanks for letting me know.