C++20 crashes Apple-Clang 13.0.0 compiler on macos-11 (from Github Actions)

[Adnn]

I am building my repositories in Github actions for several environments. We are switching to C++20, and it triggered a compiler crash when compiling spdlog (via Conan center package spdlog/1.9.2) on macos-11.

Minimal example

I made a repository triggering the issue: https://github.com/Adnn/spdlog192_appleclang_crash/actions/runs/1606462938

Steps to reproduce

Running this command:

conan install --build=missing -s compiler.cppstd=20 spdlog/1.9.2@

Results in a compiler crash on macos-11:

[ 71%] Building CXX object source_subfolder/CMakeFiles/spdlog.dir/src/async.cpp.o
clang: error: unable to execute command: Segmentation fault: 11
clang: error: clang frontend command failed due to signal (use -v to see invocation)
Apple clang version 13.0.0 (clang-1300.0.29.3)
Target: x86_64-apple-darwin20.6.0
Thread model: posix
InstalledDir: /Applications/Xcode_13.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
clang: note: diagnostic msg:

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/file_sinks-937046.cpp
clang: note: diagnostic msg: /var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/file_sinks-937046.sh
clang: note: diagnostic msg: Crash backtrace is located in
clang: note: diagnostic msg: /Users/runner/Library/Logs/DiagnosticReports/clang__.crash
clang: note: diagnostic msg: (choose the .crash file that corresponds to your crash)
clang: note: diagnostic msg:

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I also posted on conan-center issue tracker.

[timblechmann]

afaict fmt is the culprit here: fmtlib/fmt#2455

[yangruihan]

I had the same problem, is this issue fixed now?

[gabime]

Should be fixed after upgrading to fmt 8.1.1

[gegles]

Should be fixed after upgrading to fmt 8.1.1

That's great news, @gabime, thanks! Will this be part of a v1.9.3 release? How soon will this happen? (we're getting spdlog via Conan Center).

Much appreciated!

[gabime]

Yes. No release date yet.

[timblechmann]

haven't been able to test, yet, but apparently fixed it in xcode13.3