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2022-02-17T01:17:09.243641Z
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V 915
crunchgen: remove -dc from linker invocation

In GNU ld and ld.lld, -dc is used with -r to allocate space to COMMON
symbols.  It is presumably to work around legacy code which cannot
handle COMMON symbols in relocatable output.  ld.lld may remove -dc or
make it a no-op for the 15.0.0 release.

As of 7420b323a014 crunch/crunchide does not require -dc, as the symbol
hiding technique no longer relied on making symbols local.

In addition -fno-common is now the default in Clang and GCC, so -dc
serves no purpose as the compiler does not generate COMMON symbols
anyway.

See https://maskray.me/blog/2022-02-06-all-about-common-symbols for more
detail on common symbols.

Reviewed by:	emaste
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D34215

(cherry picked from commit ec81497cc7260b26c2af615c54aa80f515d6c539)

Git Hash:   332166892ef341664a733e581ea99c0adad17566
Git Author: i@maskray.me
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