https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246322
--- Comment #4 from Dimitry Andric <d...@freebsd.org> ---
In any case clang 8 does not produce any .cfi directives in crt*.o, while clang
9 and 10 do.
For instance /usr/obj/usr/src/lib/csu/i386/crt1_c.s with clang becomes:
.text
.file "crt1_c.c"
# Start of file scope inline assembly
.ident "$FreeBSD: stable/11/lib/csu/i386/crt1_c.c 292000 2015-12-08
19:32:58Z emaste $"
.ident "$FreeBSD: stable/11/lib/csu/common/crtbrand.c 339300
2018-10-11 00:26:15Z emaste $"
.ident "$FreeBSD: stable/11/lib/csu/common/ignore_init.c 339300
2018-10-11 00:26:15Z emaste $"
.hidden _start1
# End of file scope inline assembly
.globl _start1 # -- Begin function _start1
.p2align 4, 0x90
.type _start1,@function
_start1: # @_start1
# %bb.0:
...
With clang 10 this becomes:
.text
.file "crt1_c.c"
# Start of file scope inline assembly
.ident "$FreeBSD: stable/11/lib/csu/i386/crt1_c.c 292000 2015-12-08
19:32:58Z emaste $"
.ident "$FreeBSD: stable/11/lib/csu/common/crtbrand.c 339300
2018-10-11 00:26:15Z emaste $"
.ident "$FreeBSD: stable/11/lib/csu/common/ignore_init.c 339300
2018-10-11 00:26:15Z emaste $"
.hidden _start1
# End of file scope inline assembly
.globl _start1 # -- Begin function _start1
.p2align 4, 0x90
.type _start1,@function
_start1: # @_start1
.cfi_startproc
# %bb.0:
...
The directives got turned on by emaste in
https://github.com/llvm/llvm-project/commit/cb1761465a0d, referring in his
commit message to bug 241562 ("failing test case:
lib.libexecinfo.backtrace_test.backtrace_fmt_basic").
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