[llvm-bugs] [Bug 26369] New: Link with libatomic for targets that don't support atomic ops for all required sizes natively.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26369

            Bug ID: 26369
           Summary: Link with libatomic for targets that don't support
                    atomic ops for all required sizes natively.
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Vasileios.Kalintiris at imgtec.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

There is a review request that fixes this at: http://reviews.llvm.org/D16613.
Without the patch that fixes the problem, the following regressions occur on
MIPS for the atomic tests:

libc++ :: std/atomics/atomics.types.generic/integral.pass.cpp                   
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong_explicit.pass.cpp
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak_explicit.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange_explicit.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add_explicit.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_and.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_and_explicit.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_or.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_or_explicit.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub_explicit.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_xor.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_xor_explicit.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_init.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_is_lock_free.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load_explicit.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store_explicit.pass.cpp 
libc++ ::
std/atomics/atomics.types.operations/atomics.types.operations.req/ctor.pass.cpp

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