ruby30 @3.0.0: error: use of undeclared identifier 'fmt'; did you mean 'fma'?

[simon-dedeo]

with MacPorts version 2.6.4

simon$ sudo port install ruby30
--->  Computing dependencies for ruby30
--->  Fetching archive for ruby30
--->  Attempting to fetch ruby30-3.0.0_0.darwin_16.x86_64.tbz2 from https://ywg.ca.packages.macports.org/mirror/macports/packages/ruby30
--->  Attempting to fetch ruby30-3.0.0_0.darwin_16.x86_64.tbz2 from https://mse.uk.packages.macports.org/ruby30
--->  Attempting to fetch ruby30-3.0.0_0.darwin_16.x86_64.tbz2 from https://lil.fr.packages.macports.org/ruby30
--->  Fetching distfiles for ruby30
--->  Verifying checksums for ruby30
--->  Extracting ruby30
--->  Configuring ruby30
--->  Building ruby30
Error: Failed to build ruby30: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_ruby30/ruby30/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port ruby30 failed

The logfile is attached.

Oddly, my particular version of Mac OS X (10.12) is flagged as bad at ​https://ports.macports.org/port/ruby30/summary

Thank you for any help -- keen to get our code up and running on the new system.

UPDATE: FIXED

After some more playing around, I noticed that there was a version incompatability between the clang residing in /usr/bin/clang, and the one in /Library/Developer/CommandLineTools/usr/bin/:

simon$ /usr/bin/clang --version
Apple LLVM version 8.1.0 (clang-802.0.42)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

simon$ /Library/Developer/CommandLineTools/usr/bin/clang --version
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

simon$ /opt/local/bin/clang --version
clang version 9.0.1 
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /opt/local/libexec/llvm-9.0/bin

For some reason, making a soft link from /Library/Developer/CommandLineTools/usr/bin/clang to /opt/local/clang seemed to trigger the right behavior. Amusingly, one reason I noticed this is that I had an older ticket here about my adventures in clang version land.

I don't know if the earlier failure to compile was triggered by running things with clang 8.1, or if it had something to do with mixing clang 8.1 and 9.0 at different stages.

I've attached the new, successful log file in case people are curious.

[simon-dedeo]

logfile output from ports ("Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_ruby30/ruby30/main.log for details")

[simon-dedeo]

(partial version of) a successful log file for the install

[ryandesign (Ryan Schmidt)]

Replying to simon-dedeo:

For some reason, making a soft link from /Library/Developer/CommandLineTools/usr/bin/clang to /opt/local/clang seemed to trigger the right behavior.

You should not be manually creating symlinks in this manner. Please undo what you did. To fix the clang version mismatch, please install matching versions of Xcode and the Xcode command line tools, using a version that is compatible with your OS version.

Oddly, my particular version of Mac OS X (10.12) is flagged as bad at ​​https://ports.macports.org/port/ruby30/summary

I wouldn't call it odd. Our build failed in the same way that yours did. So there is something wrong there that we need to fix.

[simon-dedeo]

Thank you Ryan; I'm doing the Xcode/Xcode command line tools update now, and I'll let you know what happens. Downstream from the successful compile I had some weird behaviors from ruby30 itself (i.e., when running it), so it wasn't a successful install, just one that didn't crash at install time.

[simon-dedeo]

re-running with updated XCode, and no weird symlinks; new version fails again

[simon-dedeo]

Just comparing the log files, there's very little different except that the successful compile was with clang version 9.0.1 , the unsuccessful with Apple LLVM version 9.0.0 (clang-900.0.39.2) ; i.e., perhaps this has to do with a subtle difference between the two branches of clang.

[simon-dedeo]

In case it helps, I managed to get the installation to work with the following trick. Obviously this is not the way someone wants to do it in the long term! It's based on reading (via Google translate) the remarks at ​https://koic.hatenablog.com/entry/update-clang-for-ruby-2-8-0-dev which suggest that it's the version of clang that's causing trouble. If it is indeed clang-9, this might explain why both lower and higher versions of Mac OS X than 10.12 are able to install 3.0.

First, update clang to 11 (at least that's what I did):

sudo port install clang-11

port select --set clang mp-clang-11

Then, try to install ruby30; when it crashes do the following as superuser (if necessary):

cd /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_ruby30/ruby30/work/ruby-3.0.0

./configure --prefix=/opt/local --enable-shared --enable-install-static-library --disable-install-doc --mandir=/opt/local/share/man --enable-pthread --without-gmp --with-opt-dir=/opt/local --program-suffix=3.0 --with-rubylibprefix=/opt/local/lib/ruby3.0 --without-baseruby --with-arch=x86_64 CC=/opt/local/bin/clang

make clean

Finally, run sudo port install ruby30 again.

This forces the port to install with the clang-11 compiler; the magic is the final additional option.