llvm dev - Nov 2020 - clang-aarch64-linux-build-cache & clang-armv7-linux-build-cache are failing due to libcxxabi compile issues

Seems that they have been failing for a week due to libcxxabi compile issues.

http://lab.llvm.org:8011/#/builders/103
http://lab.llvm.org:8011/#/builders/35

Including Leandro as who seems to maintain the workers - could you take a look
at this? This could help committers from receiving "Buildbot failure in
LLVM
Buildbot on" spam.

I can reproduce the failure. It looks like a side-effect of
https://reviews.llvm.org/D88301 [libc++] Clean up logic around aligned/sized
allocation and deallocation

Empirically it looks like __builtin_operator_new(__args...); needs clang 7.0 or
above to compile, at least on Arm and AArch64. The build-bot is using clang
5.01.

It looks like to fix this the compiler on the buildbot will need upgrading or
we'll need to retire the buildbot. I have some tickets lodged with an
infrastructure team but until they are resolved I suggest ignoring it.

Peter

/home/tcwg-buildslave/buildslave/clang-aarch64-linux-build-cache/llvm/libcxxabi/../libcxx/include/new:236:33:
error: too many arguments to function call, expected 1, have 2
  return __builtin_operator_new(__args...);
         ~~~~~~~~~~~~~~~~~~~~~~ ^~~~~~
/home/tcwg-buildslave/buildslave/clang-aarch64-linux-build-cache/llvm/libcxxabi/../libcxx/include/new:257:12:
note: in instantiation of function template specialization
'std::__1::__libcpp_operator_new<unsigned long, std::align_val_t>'
requested here
    return __libcpp_operator_new(__size, __align_val);
           ^
/home/tcwg-buildslave/buildslave/clang-aarch64-linux-build-cache/llvm/libcxxabi/../libcxx/include/new:246:29:
error: too many arguments to function call, expected 1, have 2
  __builtin_operator_delete(__args...);
  ~~~~~~~~~~~~~~~~~~~~~~~~~ ^~~~~~
/home/tcwg-buildslave/buildslave/clang-aarch64-linux-build-cache/llvm/libcxxabi/../libcxx/include/new:298:14:
note: in instantiation of function template specialization
'std::__1::__libcpp_operator_delete<void *, std::align_val_t>'
requested here
      return __libcpp_operator_delete(__ptr, __align_val);
             ^
2 errors generated.

________________________________________
From: llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of Fangrui
Song via llvm-dev <llvm-dev at lists.llvm.org>
Sent: 03 November 2020 22:04
To: llvm-dev
Cc: Leandro Nunes
Subject: [llvm-dev] clang-aarch64-linux-build-cache &
clang-armv7-linux-build-cache are failing due to libcxxabi compile issues

Seems that they have been failing for a week due to libcxxabi compile issues.

http://lab.llvm.org:8011/#/builders/103
http://lab.llvm.org:8011/#/builders/35

Including Leandro as who seems to maintain the workers - could you take a look
at this? This could help committers from receiving "Buildbot failure in
LLVM
Buildbot on" spam.
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