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libpmc: Use LIB_CXX instead of explicit LDADD to link a C++ library.
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Authored by jhb on Mar 22 2023, 2:46 AM.
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Details

Summary

This uses the C++ compiler as the linker instead of the C compiler
letting the compiler driver pick the right libraries. This is a no-op
on main and stable/13 but matters for stable/12 where the current
logic breaks for external GCC since it tries to use a non-existent
libstdc++.

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rG FreeBSD src repository
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