[ruby-core:111713] [Ruby master Bug#19005] Ruby interpreter compiled XCode 14 cannot build some native gems on macOS

Issue #19005 has been updated by stanhu (Stan Hu).


I think this problem was "accidentally" fixed in Ruby 2.7.7 and 3.0.5, but it's not working in Ruby 3.1.3 and up due to a simple removal of a dollar sign (https://github.com/ruby/ruby/commit/667aa81219ca080c0a4b9f97d29bb3221bd08a33). 

In Ruby 3.1.3, I'm not seeing the `ADDITIONAL_DLDFLAGS` set with `-Wl,-undefined,dynamic_lookup`:

```ruby
irb(main):001:0> RUBY_VERSION
=> "3.1.3"
irb(main):002:0> RbConfig::CONFIG['ADDITIONAL_DLDFLAGS']
=> ""
```

Whereas 3.0.5 has this:

```ruby
irb(main):001:0> RUBY_VERSION
=> "3.0.5"
irb(main):002:0> RbConfig::CONFIG['ADDITIONAL_DLDFLAGS']
=> "-Wl,-undefined,dynamic_lookup"
```

If I look at the `./configure` output in Ruby 3.0.5 or 2.7.7, I see something like this:

```
checking whether -Wl,-undefined,dynamic_lookup is accepted as LDFLAGS... ./configure: line 29806: -Wl,-undefined,dynamic_lookup=: command not found
checking whether -Wl,-undefined,dynamic_lookup is accepted for bundle... no
```

But with 3.1.3 and up, the `LDFLAGS` check is a straight no:

```
checking whether -Wl,-undefined,dynamic_lookup is accepted as LDFLAGS... no
```

The `configure` output with Ruby 3.0.5 looks like:

```
if ac_fn_c_try_link "$LINENO"
then :

    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
    printf "%s\n" "${msg_result_yes}yes${msg_reset}" >&6 ; }
else $as_nop
  $flag=
    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
    printf "%s\n" "${msg_result_no}no${msg_reset}" >&6 ; }
fi
```

The failing line in question is `$flag=`.

In Ruby 3.1.3 and up, it appears `$flag=` has been replaced with `flag=` due to https://github.com/ruby/ruby/commit/667aa81219ca080c0a4b9f97d29bb3221bd08a33:

```
if ac_fn_c_try_link "$LINENO"
then :

    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
    printf "%s\n" "${msg_result_yes}yes${msg_reset}" >&6 ; }
else $as_nop
  flag=
    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
    printf "%s\n" "${msg_result_no}no${msg_reset}" >&6 ; }
fi
```


----------------------------------------
Bug #19005: Ruby interpreter compiled XCode 14 cannot build some native gems on macOS
https://bugs.ruby-lang.org/issues/19005#change-101110

* Author: stanhu (Stan Hu)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 2.7.6p219 (2022-04-12 revision 44c8bfa984) [arm64-darwin21]
* Backport: 2.7: DONE, 3.0: DONE, 3.1: DONE
----------------------------------------
This seems related to https://bugs.ruby-lang.org/issues/18912 and https://bugs.ruby-lang.org/issues/18981 .

Steps to reproduce:

1. Upgrade to XCode 14.
2. Compile a new Ruby interpreter. I used the version provided in https://github.com/ruby/ruby/pull/6297 with `./configure --prefix=/tmp/ruby --with-openssl-dir=$(brew --prefix openssl@1.1) --with-readline-dir=$(brew --prefix readline) --enable-shared`.
3. Confirm that `-Wl,-undefined,dynamic_lookup` is no longer available:

```
irb(main):001:0> RbConfig::CONFIG['DLDFLAGS']
=> "-Wl,-multiply_defined,suppress"
```

4. Ran `gem install pg_query` (`gem install ffi-yajl` will also fail).

Error:

```
linking shared-object pg_query/pg_query.bundle
Undefined symbols for architecture arm64:
  "Init_pg_query", referenced from:
     -exported_symbol[s_list] command line option
     (maybe you meant: _Init_pg_query)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
```

I can workaround the problem by doing:

```
gem install pg_query -- --with-ldflags="-Wl,-undefined,dynamic_lookup"
```







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