[llvm-dev] [RFC] [lld] Replace use of 'concurrency::parallel_for_each' with standard library

[Owen Reynolds via llvm-dev]

Hello all,

Last year I submitted a bug regarding the use of 'parallel_for_each' and
Windows Concurrency Library. We have found that when compiling in Visual
Studio 2015 and 2017 with /MTd, the use of 'concurrency::parallel_for_each'
can cause unhandled exceptions when the program is exiting.

https://bugs.llvm.org/show_bug.cgi?id=34976

After having some difficulty clarifying this issue with Microsoft I
submitted the issue again this week and have found that they are aware of
the problem. However, I've yet to be given any information on a timescale
for a fix.

https://developercommunity.visualstudio.com/content/problem/198027/use-of-concurrencyparallel-for-each-with-the-multi.html

For our team this bug has caused problems when testing LLD. We suggest the
removal of this MSVC specific functionality in "llvm::parallel" until a fix
is made or alternative found. This could be easily swapped to use the
existing standard library implementation in the meantime.

Owen Reynolds
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