[Bug 240717] Building kernel fails when using linker from llvm ports

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240717

            Bug ID: 240717
           Summary: Building kernel fails when using linker from llvm
                    ports
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: sid at bsdmail.com

When building a kernel using llvm70 and llvm80, I got this error message.

 kernel.full
 ld.lld: error: unknown -z value: common-page-size=4096

This error doesn't occur when building the base system or for a few ports.
Also, this error happens when building a kernel after a basesystem was rebuilt
without linker in it.

Because LD is not working from make.conf, I softlinked /usr/bin/ld to llvm's
different linkers from ports.

When I softlinked /usr/bin/ld to /local/x86_64-unknown-freebsd12.0/bin/ld
(binutil's linker) this worked.

This error may be likely with other llvm versions too, and also for other
architectures.

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