TruffleRuby - GraalVM Community Edition 19.3.0

Ruby is an experimental language in the GraalVM 19.3.0 release. More information is available on the GraalVM website. Changes in 19.3.0 (from the project changelog):

New features:

• Compilation of C extensions is now done with an internal LLVM toolchain producing both native code and bitcode. This means more C extensions should compile out of the box and this should resolve most linker-related issues.
• It is no longer necessary to install LLVM for installing C extensions on TruffleRuby.
• It is no longer necessary to install libc++ and libc++abi for installing C++ extensions on TruffleRuby.
• On macOS, it is no longer necessary to install the system headers package (#1417).
• License updated to EPL 2.0/GPL 2.0/LGPL 2.1 like recent JRuby.

Bug fixes:

• rb_undef_method now works for private methods (#1731, @cky).
• Fixed several issues when requiring C extensions concurrently (#1565, @eregon).
• self.method ||= value with a private method now works correctly (#1673, @pitr-ch).
• Fixed RegexpError: invalid multibyte escape for binary regexps with a non-binary String (#1433, @aardvark179).
• Arrays now report their methods to other languages for interopability (#1768).
• Installing sassc now works due to using the LLVM toolchain (#1753).
• Renamed Truffle::Interop.respond_to? to avoid conflict with Ruby's respond_to? (#1491).
• Warn only if $VERBOSE is true when a magic comment is ignored (#1757, @nirvdrum).
• Make C extensions use the same libssl as the one used for the openssl C extension (#1770).

Compatibility:

• GC.stat can now take an optional argument (#1716, @kirs).
• Kernel#load with wrap has been implemented (#1739, @chrisseaton).
• Implemented Kernel#spawn with :chdir (#1492).
• Implemented rb_str_drop_bytes, notably used by OpenSSL (#1740, @cky).
• Include executables of default gems, needed for rails new in Rails 6.
• Use compilation flags similar to MRI for C extension compilation.
• Warn for gem update --system as it is not fully supported yet and is often not needed.
• Pass -undefined dynamic_lookup to the linker on macOS like MRI.

Performance:

• Core methods are no longer always cloned, which reduces memory footprint and should improve warmup.
• Inline cache calls to rb_intern() with a constant name in C extensions.
• Improve allocation speed of native handles for C extensions.
• Improve the performance of NIL_P and INT2FIX in C extensions.
• Various fixes to improve Rack performance.
• Optimize String#gsub(String) by not creating a Regexp and using String#index instead.
• Fixed "FrameWithoutBoxing should not be materialized" compilation issue in TryNode.

The general GraalVM 19.2.0 release notes are available on the graalvm.org website.