From: "nobu (Nobuyoshi Nakada) via ruby-core" <ruby-core@...>
Date: 2022-12-16T03:30:14+00:00
Subject: [ruby-core:111319] [Ruby master Bug#19239] miniruby is not built by default when cross-compiling ruby 3.2.0-rc1

Issue #19239 has been updated by nobu (Nobuyoshi Nakada).


Since it is macOS and disable_shared specific, I think the dependency can be in default/gmake.mk.

----------------------------------------
Bug #19239: miniruby is not built by default when cross-compiling ruby 3.2.0-rc1
https://bugs.ruby-lang.org/issues/19239#change-100689

* Author: mdalessio (Mike Dalessio)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
When cross-compiling Ruby for darwin, the default make target doesn't build miniruby, even though it's needed for symbol resolution since https://github.com/ruby/ruby/commit/50d81bf

A workaround is to run `make miniruby && make` but I'm opening this issue to discuss if something needs to be fixed.

Here is a dockerfile that reproduces the issue:

```dockerfile
FROM larskanis/rake-compiler-dock-mri-x86_64-darwin:1.2.2

RUN wget https://cache.ruby-lang.org/pub/ruby/3.2/ruby-3.2.0-rc1.tar.gz
RUN tar -zxf ruby-3.2.0-rc1.tar.gz

ENV DEBIAN_FRONTEND noninteractive
RUN apt-get -y update && \
    apt-get install -y curl git-core xz-utils build-essential zlib1g-dev libreadline-dev libssl-dev wget unzip sudo gnupg2 dirmngr cmake pkg-config autoconf libyaml-dev

ENV CC x86_64-apple-darwin-clang

RUN bash -c " \
      rvm use 3.1.0 && \
      cd ruby-3.2.0-rc1 && \
      ./configure \
        --host=x86_64-apple-darwin \
        --target=x86_64-apple-darwin \
        --build=x86_64-pc-linux-gnu \
        --disable-jit-support \
    "

RUN bash -c " \
      rvm use 3.1.0 && \
      cd ruby-3.2.0-rc1 && \
      make V=1 \
    "
```

Failure emits errors like this:

```
x86_64-apple-darwin-clang -dynamic -bundle -o ../../../.ext/x86_64-darwin/-test-/RUBY_ALIGNOF.bundle c.o cpp.o -L. -L../../.. -L. -fstack-protector-strong -Wl,-multiply_defined,suppress -Wl,-undefined,dynamic_lookup -bundle_loader '../../../miniruby'   -lpthread  
ld: file not found: ../../../miniruby
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: Leaving directory '/ruby-3.2.0-rc1/ext/-test-/RUBY_ALIGNOF'
make[2]: *** [Makefile:271: ../../../.ext/x86_64-darwin/-test-/RUBY_ALIGNOF.bundle] Error 1
make[1]: Leaving directory '/ruby-3.2.0-rc1'
make[1]: *** [exts.mk:100: ext/-test-/RUBY_ALIGNOF/all] Error 2
make: *** [uncommon.mk:330: build-ext] Error 2
```

The error stems from the LD flag `-bundle_loader '$(BUILTRUBY)'` which points at `miniruby`, even though `miniruby` has not been built.

Replacing the last command with this will successfully build Ruby:

```dockerfile
RUN bash -c " \
      rvm use 3.1.0 && \
      cd ruby-3.2.0-rc1 && \
      make miniruby V=1 && \
      make V=1 \
    "
```

This is also happening on master HEAD.

cc @katei and @alanwu who seem to be familiar with the `bundle_loader` functionality.



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