[Bug 214258] devel/openmp: spurious libm dependency

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258

Konstantin Belousov <kib at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib at FreeBSD.org

--- Comment #5 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Jan Beich (mail not working) from comment #4)
A library cannot 'pick up symbols without referencing them'.  The presence of
the the undefined references means that there are real references in the code.

Note that existence of libm.so as a separate shared object from libc is a minor
optimization.  The libm services are mandated by the C standard, so the
separate library is only a way to slighly reduce working set of the programs
that do not need them.  Linking it in is fine.

If you are so intolerate to the presence of -lm in the dependency list even
when symbols are not referenced, you can use '-Wl,--as-needed -lm
-Wl,--no-as-needed' construct to only record DT_NEEDED fro libm.so when
references actually exist.

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