Please use $HOMEBREW_PREFIX and/or brew --prefix to add a library path #1030
Description
Hi!
I'm struggling with making ruby-vips/ffi work with custom Homebrew location on Intel mac:
$ brew --prefix
/opt/brew
$ echo $HOMEBREW_PREFIX
/opt/brew
It fails with:
$ bundle exec rails c
Loading development environment (Rails 7.0.4.3)
3.2.2 :001 > require 'vips'
…/bundle/ruby/3.2.0/gems/ffi-1.15.5/lib/ffi/library.rb:145:in `block in ffi_lib': Could not open library 'glib-2.0.0': dlopen(glib-2.0.0, 0x0005): tried: 'glib-2.0.0' (no such file), '/System/Volumes/Preboot/Cryptexes/OSglib-2.0.0' (no such file), '/usr/lib/glib-2.0.0' (no such file, not in dyld cache), 'glib-2.0.0' (no such file), '/usr/local/lib/glib-2.0.0' (no such file), '/usr/lib/glib-2.0.0' (no such file, not in dyld cache). (LoadError)
Could not open library 'libglib-2.0.0.dylib': dlopen(libglib-2.0.0.dylib, 0x0005): tried: 'libglib-2.0.0.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OSlibglib-2.0.0.dylib' (no such file), '/usr/lib/libglib-2.0.0.dylib' (no such file, not in dyld cache), 'libglib-2.0.0.dylib' (no such file), '/usr/local/lib/libglib-2.0.0.dylib' (no such file), '/usr/lib/libglib-2.0.0.dylib' (no such file, not in dyld cache)
Setting the following doesn't help:
$ export LD_LIBRARY_PATH=/opt/brew/lib
$ export DYLD_LIBRARY_PATH=/opt/brew/lib
$ export DYLD_FALLBACK_LIBRARY_PATH=/opt/brew/lib
In fact I think ruby sets DYLD_LIBRARY_PATH and DYLD_FALLBACK_LIBRARY_PATH to nil on load:
$ export DYLD_FALLBACK_LIBRARY_PATH=/opt/brew/lib
$ echo $DYLD_FALLBACK_LIBRARY_PATH
/opt/brew/lib
$ export DYLD_LIBRARY_PATH=/opt/brew/lib
$ echo $DYLD_LIBRARY_PATH
/opt/brew/lib
$ irb
3.2.2 :001 > ENV['DYLD_FALLBACK_LIBRARY_PATH']
=> nil
3.2.2 :002 > ENV['DYLD_LIBRARY_PATH']
=> nil
I saw a discussion in #968 about using ENV['HOMEBREW_PREFIX'] or brew --prefix shellout to get an extra library path and I think this would solve my issue.
Using ffi from the master branch didn't fix the issue. I've added the following code to dynamic_library.rb as an experiment:
unless ENV['HOMEBREW_PREFIX'].to_s.empty?
SEARCH_PATH << File.join(ENV['HOMEBREW_PREFIX'], 'lib')
end
and it finally worked.