[Bug 233707] www/firefox: fails to build with -fstack-protector-{strong,all}

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233707

            Bug ID: 233707
           Summary: www/firefox: fails to build with
                    -fstack-protector-{strong,all}
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gecko at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: pkubaj at anongoth.pl, shawn.webb at hardenedbsd.org
            Blocks: 214864
             Flags: maintainer-feedback?(gecko at FreeBSD.org)
          Assignee: gecko at FreeBSD.org

Firefox 63 enabled -Wl,-z,nocopyreloc which broke build with non-default
SSP_C?FLAGS but Firefox 65 enable -fstack-protector-strong which broke even
default builds.

$ cc -v
FreeBSD clang version 7.0.1 (branches/release_70 346007) (based on LLVM 7.0.1)
Target: x86_64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin

$ cat >a.c
#include <time.h>

int main() {
  struct timespec ts;
  clock_gettime(CLOCK_MONOTONIC, &ts);
  return 0;
}

$ cc -fstack-protector-strong -Wl,-z,nocopyreloc a.c
ld: error: unresolvable relocation R_X86_64_PC32 against symbol
'__stack_chk_guard'; recompile with -fPIC or remove '-z nocopyreloc'
>>> defined in /lib/libc.so.7
>>> referenced by a.c
>>>               /tmp/a-b6cdf3.o:(main)
cc: error: linker command failed with exit code 1 (use -v to see invocation)


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214864
[Bug 214864] [exp-run] test build with lld as /usr/bin/ld
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