From: shyouhei@... Date: 2019-10-23T03:25:08+00:00 Subject: [ruby-core:95488] [Ruby master Bug#16271] Cannot build taglib-ruby gem on ruby-2.7.0-preview2 Issue #16271 has been updated by shyouhei (Shyouhei Urabe). Assignee changed from shyouhei (Shyouhei Urabe) to nobu (Nobuyoshi Nakada) jeremyevans0 (Jeremy Evans) wrote: > Attempting to build the taglib-ruby gem on ruby-2.7.0-preview2 fails with error messages such as: > > ``` > taglib_base_wrap.cxx:2101:9: error: no matching function for call to 'rb_rescue' > if (rb_rescue(RUBY_METHOD_FUNC(SWIG_AUX_NUM2ULONG), (VALUE)a, RUBY_METHOD_FUNC(SWIG_ruby_failed), 0) != Qnil) { > ^~~~~~~~~ > /usr/local/include/ruby-2.7/ruby/ruby.h:1989:7: note: candidate function not viable: no known conversion from 'VALUE (VALUE *)' (aka 'unsigned long (unsigned long *)') to 'VALUE (*)(VALUE)' (aka 'unsigned long (*)(unsigned long)') for 1st argument > VALUE rb_rescue(VALUE(*)(VALUE),VALUE,VALUE(*)(VALUE,VALUE),VALUE); > ``` > > I believe this is related to the CXX/ANYARGS changes made between ruby-2.7.0-preview1 and preview2. I was not aware these were expected to cause backwards compatibility issues, which is why I'm submitting the bug report here. > > I believe taglib-ruby uses code generated via SWIG. I'm not sure if SWIG needs to be adjusted, or if the issue is related to the use of SWIG. > > This may be a problem in the gem and not in our CXX handling. In that case, please let me know and I will post an issue in the gem's tracker. Well, it seems the function called `SWIG_ruby_failed` is prototyped as `VALUE SWIG_ruby_failed(void)` (source: https://github.com/swig/swig/blob/master/Lib/ruby/rubyprimtypes.swg). However the third argument of `rb_rescue()` is `VALUE (*)(VALUE, VALUE)` (source: ruby.h). So yes, the API change _revealed_ an arity mismatch here. `SWIG_ruby_failed` is getting more arguments than it expects, which is dangerous depending on machine ABI. It has to be fixed. I believe it's SWIG, not the gem, wihch has to handle this. ---------------------------------------- Bug #16271: Cannot build taglib-ruby gem on ruby-2.7.0-preview2 https://bugs.ruby-lang.org/issues/16271#change-82259 * Author: jeremyevans0 (Jeremy Evans) * Status: Open * Priority: Normal * Assignee: nobu (Nobuyoshi Nakada) * Target version: * ruby -v: ruby 2.7.0preview2 (2019-10-22 master 02aadf1032) [x86_64-openbsd] * Backport: 2.5: DONTNEED, 2.6: DONTNEED ---------------------------------------- Attempting to build the taglib-ruby gem on ruby-2.7.0-preview2 fails with error messages such as: ``` taglib_base_wrap.cxx:2101:9: error: no matching function for call to 'rb_rescue' if (rb_rescue(RUBY_METHOD_FUNC(SWIG_AUX_NUM2ULONG), (VALUE)a, RUBY_METHOD_FUNC(SWIG_ruby_failed), 0) != Qnil) { ^~~~~~~~~ /usr/local/include/ruby-2.7/ruby/ruby.h:1989:7: note: candidate function not viable: no known conversion from 'VALUE (VALUE *)' (aka 'unsigned long (unsigned long *)') to 'VALUE (*)(VALUE)' (aka 'unsigned long (*)(unsigned long)') for 1st argument VALUE rb_rescue(VALUE(*)(VALUE),VALUE,VALUE(*)(VALUE,VALUE),VALUE); ``` I believe this is related to the CXX/ANYARGS changes made between ruby-2.7.0-preview1 and preview2. I was not aware these were expected to cause backwards compatibility issues, which is why I'm submitting the bug report here. I believe taglib-ruby uses code generated via SWIG. I'm not sure if SWIG needs to be adjusted, or if the issue is related to the use of SWIG. This may be a problem in the gem and not in our CXX handling. In that case, please let me know and I will post an issue in the gem's tracker. -- https://bugs.ruby-lang.org/ Unsubscribe: