Bug #20631: Build failure with Xcode 16 beta and macOS 15 (Sequoia) Beta

• Status: Assigned
• Assignee: hsbt (Hiroshi SHIBATA)
• Target version: -
• Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN

[hsbt (Hiroshi SHIBATA)]

I found some issues with Xcode 16 beta and macOS 15 (Sequoia) Beta.

TestRubyOptions and TestVMDump are failed with them.

full log: https://gist.github.com/hsbt/378fe2ba47e734f2562ba9a154e1795b

I'm not sure why macOS require sudo command for that.

---

And I and @katei (Yuta Saito) also found the regression of https://bugs.ruby-lang.org/issues/18912#note-15.

>> pid = fork { p File.realpath "/" }
>> Process.waitpid(pid)
objc[82573]: +[NSPlaceholderMutableString initialize] may have been in progress in another thread when fork() was called.
objc[82573]: +[NSPlaceholderMutableString initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.
=> 82573

[hsbt (Hiroshi SHIBATA)]

I also found build failure of oj-introspect.

https://github.com/meinac/oj-introspect/blob/master/ext/oj-introspect/extconf.rb#L17

$DLDFLAGS << " -Wl,-U,#{sym.strip}"

This line is broken with Xcode 16 beta.

linking shared-object oj/introspect/introspect_ext.bundle
ld: -undefined dynamic_lookup cannot be used with -U
clang: error: linker command failed with exit code 1 (use -v to see invocation)

BTW, this is not ruby/ruby issue.

[hsbt (Hiroshi SHIBATA)]

I skipped crashed tests at https://github.com/ruby/ruby/pull/11155

These are caused by Process.daemon and Process.kill(:SEGV, ...).

[hsbt (Hiroshi SHIBATA)]

• Status changed from Open to Assigned
• Assignee set to hsbt (Hiroshi SHIBATA)

[hsbt (Hiroshi SHIBATA)]

• Related to Bug #19831: warning message of linker with macOS Sonoma beta added

[hsbt (Hiroshi SHIBATA)]

• Related to Bug #19794: Ruby 3.2.2 fails to build on macOS Sonoma betas added

[hsbt (Hiroshi SHIBATA)]

• Related to Bug #18912: Build failure with Xcode 14 and macOS 13 (Ventura) Beta added

[hsbt (Hiroshi SHIBATA)]

Xcode 16 beta 4 fixed the following issue.

This line is broken with Xcode 16 beta.
linking shared-object oj/introspect/introspect_ext.bundle
ld: -undefined dynamic_lookup cannot be used with -U
clang: error: linker command failed with exit code 1 (use -v to see invocation)

The detailed version is here:

$ pkgutil --pkg-info=com.apple.pkg.CLTools_Executables
package-id: com.apple.pkg.CLTools_Executables
version: 16.0.0.0.1.1721279336
volume: /
location: /
install-time: 1722244152

[hsbt (Hiroshi SHIBATA)]

The following case is resolved at Xcode CLI RC and macOS 15.1 beta3

pid = fork { p File.realpath "/" }
Process.waitpid(pid)

[hsbt (Hiroshi SHIBATA)]

Process.daemon is working fine at macOS 15.1 beta3 and Xcode 16 RC.

I enabled TestProcess#test_daemon_noclose again at https://github.com/ruby/ruby/commit/1ecac5d4ed620247bdb74fa2c20e1665fae75b1a

[nobu (Nobuyoshi Nakada)]

• Has duplicate Bug #20758: Build failure with macOS Sequoia (15.0) and Xcode 16 added

[nobu (Nobuyoshi Nakada)]

The Xcode version had no effect on this.
In fact, the same error appeared on macOS 15.0 for binaries built with either 16 RC or earlier versions.
Upgrading to macOS 15.1 beta (24B5046f) made the error go away.

[katei (Yuta Saito)]

• Status changed from Assigned to Closed

Applied in changeset git|c77f0b91342935f661c6e5ba0f6f5c19427da174.

---

[Bug #20631] Workaround for macOS 15.0 fork crash

macOS 15.0 24A5331b seems to have a weird issue that
CFStringCreateWithBytesNoCopy does not return NSTaggedPointerString
instance for the first call. This issue is fixed in macOS 15.1 but we
need to workaround it for macOS 15.0.

[hsbt (Hiroshi SHIBATA)]

• Status changed from Closed to Assigned