[llvm-bugs] [Bug 39051] New: [7.0 Regression] libc++abi incorrectly aligns exceptions in 32 bit builds

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https://bugs.llvm.org/show_bug.cgi?id=39051

            Bug ID: 39051
           Summary: [7.0 Regression] libc++abi incorrectly aligns
                    exceptions in 32 bit builds
           Product: libc++abi
           Version: 7.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: eric at efcs.ca
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

Libc++ commit r339431 moved the _LIBCPP_HAS_NO_ALIGNED_ALLOCATION logic from
<new> to <__config>. As a result, it was defined when building libc++abi's
fallback_malloc.cpp, which made libc++abi think posix_memalign was unavailable.

This meant that libc++abi was silently falling back to using malloc. In 32 bit
builds, malloc does not return correctly aligned memory for the exception
header.

This is a regression in the 7.0 release.

The issues was fixed in libc++abi commit r342815. This change should be merged
into the 7.1 release.

@Marshall, Louis, can you sign off on this?

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