[Bug 216012] /usr/lib/libgcc_s.so underlinks libc after r308308

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216012

            Bug ID: 216012
           Summary: /usr/lib/libgcc_s.so underlinks libc after r308308
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-toolchain at FreeBSD.org
          Reporter: jbeich at FreeBSD.org

Below example is a snippet from configure check in www/firefox. Rebuilding
world WITHOUT_LLVM_LIBUNWIND=1 makes the issue disappear.

$ pkg install -qy binutils fontconfig
$ mkdir gold
$ ln -s /usr/local/bin/ld.gold gold/ld
$ echo 'int main() {}' >a.c
$ cc -Bgold -L/usr/local/lib -lfontconfig a.c
/usr/lib/libgcc_s.so: error: undefined reference to 'free'
/usr/lib/libgcc_s.so: error: undefined reference to 'malloc'
/usr/lib/libgcc_s.so: error: undefined reference to '__stderrp'
/usr/lib/libgcc_s.so: error: undefined reference to 'memcpy'
/usr/lib/libgcc_s.so: error: undefined reference to 'getenv'
/usr/lib/libgcc_s.so: error: undefined reference to 'abort'
/usr/lib/libgcc_s.so: error: undefined reference to 'fflush'
/usr/lib/libgcc_s.so: error: undefined reference to 'memset'
/usr/lib/libgcc_s.so: error: undefined reference to '__assert'
/usr/lib/libgcc_s.so: error: undefined reference to 'snprintf'
/usr/lib/libgcc_s.so: error: undefined reference to 'fprintf'
/usr/lib/libgcc_s.so: error: undefined reference to 'fwrite'
cc: error: linker command failed with exit code 1 (use -v to see invocation)

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