I have issue with https://github.com/le0

The same problem you can see in Travis: <a href="https://travis-ci.org/le0pard/webp-ff

Thanks, but right now I have another error: <div class="highlight highlight-source

I found the problem, thanks! <div class="highlight highlight-source-shell notransl

Problem with function visibility on Linux about ffi-compiler HOT 4 CLOSED

ffi commented on June 23, 2024

Problem with function visibility on Linux

from ffi-compiler.

Comments (4)

le0pard commented on June 23, 2024

The same problem you can see in Travis: https://travis-ci.org/le0pard/webp-ffi

from ffi-compiler.

commented on June 23, 2024

It looks like WebPGetInfo() is defined in libwebp, and not in your library.

It also looks like linux does not re-export symbols from shared lib dependencies when building that shared lib.

What you need to do, is explicitly load libwebp via FFI, as well as your wrapper.

You can either use another module, and extend FFI::Library inside it, then ffi_lib, attach_function, etc, OR you can just tack it on to the end of your ffi_lib call.

e.g.

ffi_lib FFI::Compiler::Loader.find('webp_ffi'), 'webp'

from ffi-compiler.

le0pard commented on June 23, 2024

Thanks, but right now I have another error:

$ rake
rm -r ext/webp_ffi/x86_64-linux/util.o
rm -r ext/webp_ffi/x86_64-linux/webp_ffi.o
rm -r ext/webp_ffi/x86_64-linux/libwebp_ffi.so
rm -r ext/webp_ffi/x86_64-linux/libwebp_ffi.so
rm -r ext/webp_ffi/x86_64-linux/util.o
rm -r ext/webp_ffi/x86_64-linux/webp_ffi.o
gcc -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -fPIC -DHAVE_PUTS=1 -DHAVE_STDIO_H=1 -o ext/webp_ffi/x86_64-linux/util.o -c ext/webp_ffi/util.c
gcc -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -fPIC -DHAVE_PUTS=1 -DHAVE_STDIO_H=1 -o ext/webp_ffi/x86_64-linux/webp_ffi.o -c ext/webp_ffi/webp_ffi.c
gcc -shared -o ext/webp_ffi/x86_64-linux/libwebp_ffi.so ext/webp_ffi/x86_64-linux/util.o ext/webp_ffi/x86_64-linux/webp_ffi.o -fexceptions -lz -lwebp
/home/vagrant/.rvm/rubies/ruby-2.0.0-p0/bin/ruby -S rspec ./spec/webp_ffi_spec.rb
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/ffi-1.4.0/lib/ffi/library.rb:123:in `block in ffi_lib': Could not open library 'webp': webp: cannot open shared object file: No such file or directory. (LoadError)
Could not open library 'libwebp.so': libwebp.so: cannot open shared object file: No such file or directory
    from /home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/ffi-1.4.0/lib/ffi/library.rb:90:in `map'
    from /home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/ffi-1.4.0/lib/ffi/library.rb:90:in `ffi_lib'
    from /vagrant/lib/webp_ffi.rb:7:in `<module:C>'
    from /vagrant/lib/webp_ffi.rb:5:in `<module:WebpFfi>'
    from /vagrant/lib/webp_ffi.rb:4:in `<top (required)>'
    from /vagrant/spec/spec_helper.rb:3:in `require'
    from /vagrant/spec/spec_helper.rb:3:in `<top (required)>'
    from /vagrant/spec/webp_ffi_spec.rb:1:in `require'
    from /vagrant/spec/webp_ffi_spec.rb:1:in `<top (required)>'
    from /home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/rspec-core-2.13.0/lib/rspec/core/configuration.rb:819:in `load'
    from /home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/rspec-core-2.13.0/lib/rspec/core/configuration.rb:819:in `block in load_spec_files'
    from /home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/rspec-core-2.13.0/lib/rspec/core/configuration.rb:819:in `each'
    from /home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/rspec-core-2.13.0/lib/rspec/core/configuration.rb:819:in `load_spec_files'
    from /home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/rspec-core-2.13.0/lib/rspec/core/command_line.rb:22:in `run'
    from /home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/rspec-core-2.13.0/lib/rspec/core/runner.rb:80:in `run'
    from /home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/rspec-core-2.13.0/lib/rspec/core/runner.rb:17:in `block in autorun'
rake aborted!
/home/vagrant/.rvm/rubies/ruby-2.0.0-p0/bin/ruby -S rspec ./spec/webp_ffi_spec.rb failed
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/rspec-core-2.13.0/lib/rspec/core/rake_task.rb:156:in `run_task'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/rspec-core-2.13.0/lib/rspec/core/rake_task.rb:124:in `block (2 levels) in initialize'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/gems/rspec-core-2.13.0/lib/rspec/core/rake_task.rb:122:in `block in initialize'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bin/ruby_noexec_wrapper:14:in `eval'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bin/ruby_noexec_wrapper:14:in `<main>'
Tasks: TOP => default => spec
(See full trace by running task with --trace)

But library exist:

$ ls -la /usr/local/lib/
total 4504
drwxr-xr-x  5 root root     4096 Mar  8 11:53 .
drwxr-xr-x 10 root root     4096 Jun  5  2012 ..
-rw-r--r--  1 root root  2914584 Mar  8 11:53 libwebp.a
-rwxr-xr-x  1 root root      956 Mar  8 11:53 libwebp.la
lrwxrwxrwx  1 root root       16 Mar  8 11:53 libwebp.so -> libwebp.so.4.0.1
lrwxrwxrwx  1 root root       16 Mar  8 11:53 libwebp.so.4 -> libwebp.so.4.0.1
-rwxr-xr-x  1 root root  1669468 Mar  8 11:53 libwebp.so.4.0.1
drwxr-xr-x  2 root root     4096 Mar  8 11:53 pkgconfig
drwxrwsr-x  4 root staff    4096 Mar  8 11:02 python2.7
drwxr-xr-x  3 root root     4096 Mar  8 11:42 site_ruby

from ffi-compiler.

le0pard commented on June 23, 2024

I found the problem, thanks!

sudo ln -s /usr/local/lib/libwebp.* /usr/lib/

from ffi-compiler.

Problem with function visibility on Linux about ffi-compiler HOT 4 CLOSED

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