[llvm-dev] failing bootstrap: C++11 or greater is required but the compiler does not support c++11

[Kostya Serebryany via llvm-dev]

FTR, I've disabled libcxx checkout on that particular bot
<http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fuzzer> to make
it green.
The problem remains, of course. :(

On Sun, Dec 11, 2016 at 7:23 AM, James Knight <jyknight at google.com> wrote:

> On Dec 11, 2016, at 3:33 AM, Eric Fiselier via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> > So it seems that libatomic went missing between build #1379 and #1380,
> so I don't think this is related to the -std=c++11 failure. Instead it
> seems likely that the compile test for -std=c++11 is failing due to
> mis-configuring -latomic.
> >
> > Can you confirm the bot has libatomic installed?
>
> You shouldn't need it on x86-64. The issue there is that cmake is
> reporting, incorrectly:
> -- Performing Test LIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB
> -- Performing Test LIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB - Failed
>
> despite that previously in the same run, the same test configuring llvm
> itself worked:
> -- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB
> -- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB - Success
>
> I suspect that the flags change has somehow caused *all* compiler
> invocations to fail, and that results in both the erroneously-failed atomic
> check and the erroneously-failed std=c++11 check.
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