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Not passing -shared to gcc when building a shared library triggers linking to the wrong libgcc (libgcc.a instead of libgcc_s.a) and prevents emitting correct unwind information. It's somewhat surprising that this hasn't caused known problems so far. Doing so requires adding path to libgcc to libpath, or linking statically to libgcc - as the latter increases .so size substantially (for not entirely obvious reasons), shared linking seems preferrable. It likely is worth building executables with -shared-libgcc too, but I've not done that here. Discussion: https://postgr.es/m/20220820174213.d574qde4ptwdzoqz@awork3.anarazel.de