[Bug 249121] program compiled with -pg produces ld-elf abort

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249121

            Bug ID: 249121
           Summary: program compiled with -pg produces ld-elf abort
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: gnu
          Assignee: bugs at FreeBSD.org
          Reporter: wsh at riski.sh

Attempting to profile my code with gprof.

Currently compiling with clang with arguments; 
    -Weverything
    -Werror
    -Wpedantic
    -O2
    -g
    -pg

Without -pg program runs perfectly fine. With -pg lib-elf haults with message
ld-elf.so.1: /lib/libc.so.7: Undefined symbol "__progname".

On FreeBSD-12.1-p8 I received a different error of unsupported relocation type
37 in non-plt relocations with the same compile options on the same executable.

I have attached the executable compiled with pg and no pg.

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