Regression of Intel C++ Compiler v19.1 : Unresolved symbol

Using Ubuntu 19.10 or 18.04 LTS, when using the latest version of the Intel C++ Compiler issued in Parallel Studio XE 2020 (version 19.1.0.166 / 20191121), attempts to build UCX with the -ipo flag result in failure when compiling & linking sockaddr (sa); this appears to be an issue with Intel's Compiler rather than UCX because the 2018 and 2019 editions of Parallel Studio XE (versions 18.0.6.286 / 20190605 and 19.0.5.281 / 20190815, respectively) are able to compile and link it just fine. Using GCC and G++ with LTO enabled is also able to compile and link it without issue. Also attached are the entire config and build logs.

These are the symbols that are not found. Attempting to explicitly link with -lstdc++, using different C++ and GNU++ standards, etc., fail to fix the problem:

ipo: error #11021: unresolved _ZNSt14_Function_base12_M_max_alignE
        Referenced in /tmp/ipo_icpcYJnRpy.o
ipo: error #11021: unresolved _ZNSt14_Function_base11_M_max_sizeE
        Referenced in /tmp/ipo_icpcYJnRpy.o

These are the demangled symbols:

std::_Function_base::_M_max_align
std::_Function_base::_M_max_size

An extremely easily reproduceible example that will fail to build is given below:

1. git clone --recurse-submodules https://github.com/openucx/ucx.git&& cd ucx
2. ./autogen.sh
3. ./configure CC=icc CXX=icpc LD=xild AR=xiar CFLAGS="-ipo"
4. make -j$(nproc)

This is the open bug report on the UCX project (where it was stated to likely be a regression on Intel's part), detailing the same information covered here:

https://github.com/openucx/ucx/issues/4624