[Openmp-commits] [PATCH] D108534: [OpenMP][Docs] add clang to LLVM_ENABLE_PROJECTS in build instructions

Johannes Doerfert via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Tue Aug 24 07:47:07 PDT 2021

jdoerfert added a comment.

In D108534#2962150 <https://reviews.llvm.org/D108534#2962150>, @bondhugula wrote:

> In D108534#2961921 <https://reviews.llvm.org/D108534#2961921>, @JonChesterfield wrote:
>> In D108534#2961579 <https://reviews.llvm.org/D108534#2961579>, @bondhugula wrote:
>>> Seeing the discussion here, it looks like the official instructions to build LLVM openmp in-tree (at openmp.llvm.)org won't work for anyone? And it wasn't something in my cmake conf or setup.
>> I'd guess cmake failing to find pthread is local to your system.
> This would be strange because I do have it at /usr/include/pthread.h. Looking at the cmake error log pasted at https://bugs.llvm.org/show_bug.cgi?id=51579 the missing pthread.h error appears to be a symptom of something else but I'm not sure. I think the compile command being used there isn't right? (cmake error log snippet pasted below)
>   Determining if the include file pthread.h exists failed with the following output:
>   Change Dir: /home/uday/llvm-project-upstream/build/runtimes/runtimes-bins/CMakeFiles/CMakeTmp
>   Run Build Command(s):/usr/bin/ninja cmTC_f7224 && [1/2] Building C object CMakeFiles/cmTC_f7224.dir/CheckIncludeFile.c.o
>   FAILED: CMakeFiles/cmTC_f7224.dir/CheckIncludeFile.c.o 
>   /usr/bin/cc   -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wno-comment -fdiagnostics-color  -nostdinc++ -nostdlib++ -o CMakeFiles/cmTC_f7224.dir/CheckIncludeFile.c.o   -c CheckIncludeFile.c
>   cc: error: unrecognized command line option ‘-nostdlib++’; did you mean ‘-nostdlib’?
>   ninja: build stopped: subcommand failed.
> It's using the wrong compiler?

I'd guess /usr/bin/cc is very old.

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