[swift-corelibs-dev] Problems with dispatch?

[Alex Blewitt]

On a recent test build there were compile errors with libdispatch, even after a clean build:

src/libdispatch.so: error: undefined reference to '__atomic_fetch_sub_4'
src/libdispatch.so: error: undefined reference to '__atomic_load_4'
src/libdispatch.so: error: undefined reference to '__atomic_fetch_add_4'
src/libdispatch.so: error: undefined reference to '__atomic_compare_exchange_4'
src/libdispatch.so: error: undefined reference to '__atomic_fetch_or_4'
src/libdispatch.so: error: undefined reference to '__atomic_fetch_and_4'
src/libdispatch.so: error: undefined reference to '__atomic_store_4'
src/libdispatch.so: error: undefined reference to '__atomic_exchange_4'
clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation)


https://ci.swift.org/job/swift-corelibs-foundation-PR-Linux/245/consoleFull#-12390007823122a513-f36a-4c87-8ed7-cbc36a1ec144 <https://ci.swift.org/job/swift-corelibs-foundation-PR-Linux/245/consoleFull#-12390007823122a513-f36a-4c87-8ed7-cbc36a1ec144>

https://github.com/apple/swift-corelibs-foundation/pull/1189 <https://github.com/apple/swift-corelibs-foundation/pull/1189>

The changes aren't to do with libdispatch and shouldn't have caused these issues (they were related to test code only). 

Could this be due to recent build toolchain updates on the build servers?

Alex
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