-pthread not found on Mac OS X 11.6 (Big Sur), qs package does not build about qs HOT 8 CLOSED

Thank you for the information. I rarely use mac, but I do have a laptop available with Catalina. Do you know if this is an issue with Big Sur specfically?

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@traversc It appears to be. A quick google search finds several other related issues:

https://developer.apple.com/forums/thread/666700

https://stackoverflow.com/questions/65251887/clang-7-error-linker-command-failed-with-exit-code-1-for-macos-big-sur

Although, FWIW, every time the mac OS updates, I find that some of my build scripts break and I have to go hunting for low-level header files/libraries, e.g. cmath.h and boost. I use Qt Creator and cmake frequently for C++ and Qt Creator frequently needs to be reconfigured after OS updates.

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If pthreads isn't universally available, I wonder if the guidance on pthreads in "Writing R Extensions" needs to be updated?

For qs, I think the long term solution would be to switch to RcppParallel but that would require a re-factor.

I plan on forwarding this issue to the mailing list and seeing what people think.

from qs.

@traversc Great! glad you're working on the issue.

I'm happy to provide additional information if it's helpful. Best of luck in forwarding the issue to the mailing list.

from qs.

I upgraded Catalina -> Big Sur, but have not been able to reproduce the error. I commented out everything in ~/.R/Makevars just in case.

Here's my clang:

% clang++ --version
Apple clang version 12.0.0 (clang-1200.0.32.29)
Target: x86_64-apple-darwin20.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Maybe something about xcode needs to be updated?

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Hey @traversc , It's certainly possible that there is something strange about my build configuration that wouldn't affect users in general. I am running on a different version of clang++, which might be the issue:

% clang++ --version
clang version 6.0.0 (tags/RELEASE_600/final)
Target: x86_64-apple-darwin20.6.0
Thread model: posix
InstalledDir: /usr/local/clang6/bin

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Clang 6 is pretty old and I am far from an expert on Mac, but your clang isn't using xcode which is a little strange to me.

The official R documentation recommends building xcode:

sudo xcode-select --install

https://mac.r-project.org/tools/

I wonder if that would help?

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Hey @traversc ,
Thanks for the suggestion, but the I already have the xcode command line tools, and I've run the command you've suggested before. I'm also using the llvm compiler for some programs, and I've had to mess with some low-level configuration files to manage multiple compilers. It might be safe to say that this issue is probably specific to my system, and not a big problem. I'm not sure why qread() was crashing, but I'm glad I could get it all to work once I rebuilt the package. Thanks again for all of your help!

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