From: "k0kubun (Takashi Kokubun) via ruby-core" <ruby-core@...>
Date: 2026-03-16T18:36:05+00:00
Subject: [ruby-core:125015] [Ruby Bug#21917] Unable to build 4.0.1 on AIX 7.2

Issue #21917 has been updated by k0kubun (Takashi Kokubun).

Backport changed from 3.2: DONTNEED, 3.3: DONTNEED, 3.4: DONTNEED, 4.0: REQUIRED to 3.2: DONTNEED, 3.3: DONTNEED, 3.4: DONTNEED, 4.0: DONE

ruby_4_0 commit:0d845e4a071f67de40e1151cafb419c7aba87050 merged revision(s) commit:361644c0cce3235e9cc6724994c6b5711deb10b8.

----------------------------------------
Bug #21917: Unable to build 4.0.1 on AIX 7.2
https://bugs.ruby-lang.org/issues/21917#change-116712

* Author: mhashizume (Michael Hashizume)
* Status: Closed
* ruby -v: 4.0.1
* Backport: 3.2: DONTNEED, 3.3: DONTNEED, 3.4: DONTNEED, 4.0: DONE
----------------------------------------
I'm attempting to build Ruby 4.0.1 on AIX 7.2. We have had successful builds of previous versions of Ruby on this platform, but are starting to see an issue when using miniruby to build Ruby:

``` shell
./miniruby -I./lib -I. -I.ext/common  ./tool/runruby.rb --extout=.ext  -- --disable-gems -r./powerpc64-aix7.2.0.0-fake ./tool/rbinstall.rb --make="gmake" --dest-dir="" --extout=".ext" --ext-build-dir="./ext" --mflags="-j3 --jobserver-auth=fifo:/tmp//GMfifo9306586" --make-flags=" -j3 --jobserver-auth=fifo:/tmp//GMfifo9306586" --data-mode=0644 --prog-mode=0755 --installed-list .installed.list --mantype="man"  --install=all --exclude=doc
/var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/.ext/common/monitor.rb:10:in 'Kernel#require': false() function is unimplemented on this machine (NotImplementedError)
	from /var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/.ext/common/monitor.rb:10:in '<top (required)>'
	from /var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/lib/rubygems.rb:1452:in '<top (required)>'
	from /var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/lib/rubygems.rb:1452:in 'Kernel#eval'
	from /var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/lib/rubygems.rb:1452:in '<top (required)>'
	from ./tool/rbinstall.rb:25:in 'Kernel#require'
	from ./tool/rbinstall.rb:25:in '<main>'
```

I'm not sure where the NotImplementedError is coming from, and when looking at the `truss` output from miniruby, I see a ENOTTY when miniruby attempts to load monitor.so:

```shell
accessx("/var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/.ext/powerpc64-aix7.2.0.0/monitor.so", 0, 0) = 0
statx("/", 0x0FFFFFFFFFFFA680, 176, 011)        = 0
statx("/var", 0x0FFFFFFFFFFFA680, 176, 011)     = 0
statx("/var/tmp", 0x0FFFFFFFFFFFA680, 176, 011) = 0
statx("/var/tmp/tmp.INfzUXAeGi", 0x0FFFFFFFFFFFA680, 176, 011) = 0
statx("/var/tmp/tmp.INfzUXAeGi/ruby-4.0.1", 0x0FFFFFFFFFFFA680, 176, 011) = 0
statx("/var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/.ext", 0x0FFFFFFFFFFFA680, 176, 011) = 0
statx("/var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/.ext/powerpc64-aix7.2.0.0", 0x0FFFFFFFFFFFA680, 176, 011) = 0
statx("/var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/.ext/powerpc64-aix7.2.0.0/monitor.so", 0x0FFFFFFFFFFFA680, 176, 011) = 0
__ksetjmp(0x0000000110019F88, 0x09000000026845A8, 2, 0x000000011001A1D8, 0x0FFFFFFFFFFFB790, 0x0000000022242202, 0x000000011011A658, 0x09000
00000260348) = 0
statx("/var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/.ext/powerpc64-aix7.2.0.0/monitor.so", 0x0FFFFFFFFFFFB800, 176, 0) = 0
kioctl(2, 22528, 0x0000000000000000, 0x0000000000000000) Err#25 ENOTTY
/var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/.ext/common/monitor.rb:10:in 'Kernel#require': false() function is unimplemented on this machine (NotImpl
ementedError)
        from /var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/.ext/common/monitor.rb:10:in '<top (required)>'
        from /var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/lib/rubygems.rb:1452:in '<top (required)>'
        from /var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/lib/rubygems.rb:1452:in 'Kernel#eval'
        from /var/tmp/tmp.INfzUXAeGi/ruby-4.0.1/lib/rubygems.rb:1452:in '<top (required)>'
        from ./tool/rbinstall.rb:25:in 'Kernel#require'
        from ./tool/rbinstall.rb:25:in '<main>'
```

monitor.so is present in the path that miniruby is looking for it. 

Any pointers on where to start debugging this further or what changes in more recent versions of Ruby could have caused this would be greatly appreciated.

Thank you!



-- 
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