Compatibility with Ruby 3.1.6

[Swiss-Edward]

I just updated a Rails 7.1 application from Ruby 3.1.4 to Ruby 3.1.6 and now the Rdmtx gem no longer compiles. It fails with the error message:

Installing Rdmtx 0.5.0 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/Rdmtx-0.5.0/ext/rdmtx
/opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/bin/ruby -I /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/3.1.0 extconf.rb
checking for -ldmtx... no
creating Makefile

current directory: /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/Rdmtx-0.5.0/ext/rdmtx
make DESTDIR\= sitearchdir\=./.gem.20241001-23101-xo6hmj sitelibdir\=./.gem.20241001-23101-xo6hmj clean

current directory: /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/Rdmtx-0.5.0/ext/rdmtx
make DESTDIR\= sitearchdir\=./.gem.20241001-23101-xo6hmj sitelibdir\=./.gem.20241001-23101-xo6hmj
compiling Rdmtx.c
Rdmtx.c:26:10: fatal error: 'dmtx.h' file not found
   26 | #include <dmtx.h>
      |          ^~~~~~~~
1 error generated.
make: *** [Rdmtx.o] Error 1

make failed, exit code 2

Gem files will remain installed in /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/Rdmtx-0.5.0 for inspection.
Results logged to /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/extensions/arm64-darwin-24/3.1.0/Rdmtx-0.5.0/gem_make.out

  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/3.1.0/rubygems/ext/builder.rb:102:in `run'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/3.1.0/rubygems/ext/builder.rb:51:in `block in make'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/3.1.0/rubygems/ext/builder.rb:43:in `each'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/3.1.0/rubygems/ext/builder.rb:43:in `make'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/3.1.0/rubygems/ext/ext_conf_builder.rb:42:in `build'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/3.1.0/rubygems/ext/builder.rb:171:in `build_extension'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/3.1.0/rubygems/ext/builder.rb:205:in `block in build_extensions'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/3.1.0/rubygems/ext/builder.rb:202:in `each'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/3.1.0/rubygems/ext/builder.rb:202:in `build_extensions'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/3.1.0/rubygems/installer.rb:843:in `build_extensions'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/rubygems_gem_installer.rb:72:in `build_extensions'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/rubygems_gem_installer.rb:28:in `install'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/source/rubygems.rb:202:in `install'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/installer/gem_installer.rb:54:in `install'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/installer/gem_installer.rb:16:in `install_from_spec'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/installer/parallel_installer.rb:156:in `do_install'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/installer/parallel_installer.rb:147:in `block in worker_pool'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/worker.rb:62:in `apply_func'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/worker.rb:57:in `block in process_queue'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/worker.rb:54:in `loop'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/worker.rb:54:in `process_queue'
  /opt/homebrew/Cellar/asdf/0.14.0/installs/ruby/3.1.6/lib/ruby/gems/3.1.0/gems/bundler-2.4.19/lib/bundler/worker.rb:90:in `block (2 levels) in create_threads'

Rolling back to Ruby 3.1.4 resolved the issue. Has Rdmtx been tested with Ruby 3.1.6?

[srijan]

It should be compatible.

The error you're getting is Rdmtx.c:26:10: fatal error: 'dmtx.h' file not found, which makes me think that it cannot find the dmtx shared library needed for compilation. Check if that's installed for your system.

(Originally published at: https://srijan.ch/notes/2024-10-01-001)

[Swiss-Edward]

Thank you for your prompt reply.

I have verified that the dmtx shared library is installed and that the file dmtx.h exists on my system. A find on the file dmtx.h generates the following locations:

System/Volumes/Data/opt/homebrew/include/dmtx.h
/System/Volumes/Data/opt/homebrew/Cellar/libdmtx/0.7.7/include/dmtx.h
/opt/homebrew/include/dmtx.h
/opt/homebrew/Cellar/libdmtx/0.7.7/include/dmtx.h
/dev/fd/6/System/Volumes/Data/opt/homebrew/include/dmtx.h
/dev/fd/6/System/Volumes/Data/opt/homebrew/Cellar/libdmtx/0.7.7/include/dmtx.h
/dev/fd/6/opt/homebrew/include/dmtx.h
/dev/fd/6/opt/homebrew/Cellar/libdmtx/0.7.7/include/dmtx.h

Everything here seems "standard" to me.

I find it really odd that this only pops up with an update from Ruby 3.1.4 to Ruby 3.1.6. Have you tried this gem with Rails 7.1 and Ruby 3.1.6?

[Swiss-Edward]

I found the problem. Even though the gem was installed correctly under Ruby 3.1.4, it had to be re-installed when moving to Ruby 3.1.6 with:

gem install Rdmtx -v '0.5.0' -- --with-opt-dir="/opt/homebrew"