[ruby-core:109907] [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).


It's possible this is a problem with the respective gems. In https://github.com/pganalyze/pg_query/issues/255#issuecomment-1248800937, I note that the `Init_pg_query` is using C++ visibility rules.

However, for `ffi-yajl`, I'm not sure this is the same problem:

```
compiling encoder.c
encoder.c:307:14: warning: unused function 'rb_cBignum_ffi_yajl' [-Wunused-function]
static VALUE rb_cBignum_ffi_yajl(VALUE self, VALUE rb_yajl_gen, VALUE state) {
             ^
1 warning generated.
linking shared-object ffi_yajl/ext/encoder.bundle
Undefined symbols for architecture arm64:
  "_yajl_gen_alloc", referenced from:
      _mEncoder_do_yajl_encode in encoder.o
  "_yajl_gen_array_close", referenced from:
      _gen_array_close in encoder.o
  "_yajl_gen_array_open", referenced from:
      _gen_array_open in encoder.o
  "_yajl_gen_bool", referenced from:
      _gen_true in encoder.o
      _gen_false in encoder.o
  "_yajl_gen_config", referenced from:
      _mEncoder_do_yajl_encode in encoder.o
  "_yajl_gen_free", referenced from:
      _mEncoder_do_yajl_encode in encoder.o
  "_yajl_gen_get_buf", referenced from:
      _mEncoder_do_yajl_encode in encoder.o
  "_yajl_gen_map_close", referenced from:
      _gen_map_close in encoder.o
  "_yajl_gen_map_open", referenced from:
      _gen_map_open in encoder.o
  "_yajl_gen_null", referenced from:
      _gen_null in encoder.o
  "_yajl_gen_number", referenced from:
      _gen_number in encoder.o
  "_yajl_gen_string", referenced from:
      _gen_cstring in encoder.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [encoder.bundle] Error 1
```

----------------------------------------
Bug #19005: Ruby interpreter compiled XCode 14 cannot build some native gems on macOS
https://bugs.ruby-lang.org/issues/19005#change-99152

* Author: stanhu (Stan Hu)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
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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