[ruby-core:109919] [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).


Yes, it's only a few gems that previously depended on `-undefined dynamic_lookup` being present as a linker argument.

In the `pg_query` case, it seems that there is a bug: the library exports a symbol that's not actually present.

In the `ffi-yajl` case, it seems that the gem expects to `dlopen()` the `yayl` library, so the symbols are not present until the extension is actually loaded. We can resolve that by explicitly marking the symbols that will be used dynamically.

However, it's interesting to me that the Ruby `configure` script returned 0 compiling the program, but still marked the flag as being unavailable:

```
configure:28712: checking whether -Wl,-undefined,dynamic_lookup is accepted as LDFLAGS
configure:28739: gcc -o conftest -g -O2 -Wall -Wextra -Wdeprecated-declarations -Wdivision-by-zero -Wimplicit-function-declaration -Wimplicit-int -Wmisleading-indentation -Wpointer-arith -Wshorten-\
64-to-32 -Wwrite-strings -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-parentheses-equality -W\
no-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wunused-variable -Wextra-tokens -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -fstack-\
protector-strong -Wl,-undefined,dynamic_lookup conftest.c -lpthread -ldl -lobjc >&5
ld: warning: -undefined dynamic_lookup may not work with chained fixups
configure:28739: $? = 0
configure: failed program was:
```

I don't know if there's a way to suppress that warning.
I think it's because the `configure` expects no output:

```
  (eval "$ac_link") 2>conftest.err
  ac_status=$?
  if test -s conftest.err; then
    grep -v '^ *+' conftest.err >conftest.er1
    cat conftest.er1 >&5
    mv -f conftest.er1 conftest.err
  fi
```




----------------------------------------
Bug #19005: Ruby interpreter compiled XCode 14 cannot build some native gems on macOS
https://bugs.ruby-lang.org/issues/19005#change-99166

* Author: stanhu (Stan Hu)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.6p219 (2022-04-12 revision 44c8bfa984) [arm64-darwin21]
* 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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