[ruby-core:108425] [Ruby master Bug#18758] Ruby fails to build on M1 Mac when x86 Homebrew is installed

Issue #18758 has been updated by tenderlovemaking (Aaron Patterson).


I tried to attach the patch but it just says "internal server error" 

![redmin screenshot](https://user-images.githubusercontent.com/3124/165644334-b8dd1878-d33f-4673-b381-6338f2d11ef2.png)

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Bug #18758: Ruby fails to build on M1 Mac when x86 Homebrew is installed
https://bugs.ruby-lang.org/issues/18758#change-97460

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
If you install x86 homebrew on an M1 mac, then install libyaml in the x86 version of homebrew, Ruby will fail to build on ARM.

Steps to reproduce:

1. Install x86 homebrew: `$ arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"`
2. Install x86 libyaml: `$ arch -x86_64 /usr/local/bin/brew install libyaml`
3. Configure and compile Ruby with ARM architecture

I expected Ruby to compile, but Psych fails with the following output:

```
/Users/aaron/git/ruby/tool/extlibs.rb:6:in `require': cannot load such file -- digest (LoadError)
	from /Users/aaron/git/ruby/tool/extlibs.rb:6:in `<top (required)>'
	from /Users/aaron/git/ruby/ext/psych/extconf.rb:24:in `require_relative'
	from /Users/aaron/git/ruby/ext/psych/extconf.rb:24:in `<top (required)>'
	from ./ext/extmk.rb:217:in `load'
	from ./ext/extmk.rb:217:in `block in extmake'
	from /Users/aaron/git/ruby/lib/mkmf.rb:324:in `open'
	from ./ext/extmk.rb:213:in `extmake'
	from ./ext/extmk.rb:577:in `block in <main>'
	from ./ext/extmk.rb:573:in `each'
	from ./ext/extmk.rb:573:in `<main>'
```

`mkmf.log` from Psych says:

```
ld: warning: ignoring file /usr/local/lib/libyaml.dylib, building for macOS-arm64 but attempting to link with file built for macOS-x86_64
```

I believe the problem is the default LDFLAGS set by configure.  The output of configure is:

```
   * LDFLAGS:             -L. -fstack-protector-strong -L/usr/local/lib
```

I don't think `/usr/local/lib` should be in `LDFLAGS` by default.

I've attached a patch that fixes the problem for me, and I sent the same patch as a PR on GitHub: https://github.com/ruby/ruby/pull/5855

Thanks!



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