<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">On a recent test build there were compile errors with libdispatch, even after a clean build:<div class=""><br class=""></div><div class=""><pre class="console-output" style="box-sizing: border-box; white-space: pre-wrap; word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; font-size: 13px; background-color: rgb(43, 48, 59); color: rgb(192, 197, 206); padding: 20px; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px;"><span title="Compile Error" style="box-sizing: border-box; color: white; background-color: red; background-position: initial initial; background-repeat: initial initial;" class="">src/libdispatch.so: error: undefined reference to '__atomic_fetch_sub_4'
</span>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)
</pre></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><a href="https://ci.swift.org/job/swift-corelibs-foundation-PR-Linux/245/consoleFull#-12390007823122a513-f36a-4c87-8ed7-cbc36a1ec144" class="">https://ci.swift.org/job/swift-corelibs-foundation-PR-Linux/245/consoleFull#-12390007823122a513-f36a-4c87-8ed7-cbc36a1ec144</a></div><div class=""><br class=""></div><div class=""><a href="https://github.com/apple/swift-corelibs-foundation/pull/1189" class="">https://github.com/apple/swift-corelibs-foundation/pull/1189</a></div><div class=""><br class=""></div><div class="">The changes aren't to do with libdispatch and shouldn't have caused these issues (they were related to test code only). </div><div class=""><br class=""></div><div class="">Could this be due to recent build toolchain updates on the build servers?</div><div class=""><br class=""></div><div class="">Alex</div></body></html>