Tracepoints break shared library linking for downstream projects

[aliher1911]

When building fbthrift with BUILD_SHARED_LIBS=ON (which is required for logdevice or openr)

one would get errors like: facebook/fbthrift#384 (CMakeFiles/thriftcpp2.dir/util/ScopedServerInterfaceThread.cpp.o(.note.stapsdt+0x14): error: relocation refers to local symbol "" [3032], which is defined in a discarded section
section group signature: "ZN6apache6thrift11concurrency13ThreadManager5ImplTIN5folly11LifoSemImplISt6atomicNS4_19SaturatingSemaphoreILb1ES6_EEEEE15reportTaskStatsERKNS2_4TaskERKNSt6chrono10time_pointINSE_3_V212steady_clockENSE_8durationIlSt5ratioILl1ELl1000000000EEEEEESO"
prevailing definition is from CMakeFiles/thriftcpp2.dir/server/ThriftServer.cpp.o)

This is caused by .note section generated for SDT not being part of the same section group as symbol of a traced function. If subsequently this section is omitted as duplicate by linker (which happens because trace is added to a templated function) relocation reference would become dangling and linking will fail.

[aliher1911]

Anyone?