The branch stable/12 has been updated by kevans:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=1801534a5c8a73b684176c67aa3eb7cfa5116a81

commit 1801534a5c8a73b684176c67aa3eb7cfa5116a81
Author:     Alex Richardson <[email protected]>
AuthorDate: 2021-03-30 13:52:31 +0000
Commit:     Kyle Evans <[email protected]>
CommitDate: 2021-10-08 05:24:28 +0000

    libsa: Remove conflicting .global/.weak directive
    
    LLVM12 complains if you change the symbol binding:
    `error: _longjmp changed binding to STB_GLOBAL`
    In this case LLVM actually ignored the weak directive and used the
    later .global, but GNU as would mark the symbol as weak.
    None of the other architectures mark the libsa _setjmp as weak so
    just drop this directive.
    
    (cherry picked from commit 59b2caef0537661397caf2ce1398cf802cb864b4)
---
 stand/libsa/amd64/_setjmp.S | 1 -
 1 file changed, 1 deletion(-)

diff --git a/stand/libsa/amd64/_setjmp.S b/stand/libsa/amd64/_setjmp.S
index 6d9a5fa13f8d..53ea6e9b5d52 100644
--- a/stand/libsa/amd64/_setjmp.S
+++ b/stand/libsa/amd64/_setjmp.S
@@ -63,7 +63,6 @@ ENTRY(_setjmp)
        ret
 END(_setjmp)
 
-       .weak   CNAME(_longjmp)
 ENTRY(_longjmp)
        movq    %rdi,%rdx
        /* Restore the mxcsr, but leave exception flags intact. */

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