git: baeb0b2fb4d0 - stable/12 - stand: remove CLANG_NO_IAS from cdboot

[Dimitry Andric]

The branch stable/12 has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=baeb0b2fb4d02155e992fdd9e9a586592d45e48a

commit baeb0b2fb4d02155e992fdd9e9a586592d45e48a
Author:     Ed Maste <emaste at FreeBSD.org>
AuthorDate: 2019-08-15 17:32:39 +0000
Commit:     Dimitry Andric <dim at FreeBSD.org>
CommitDate: 2021-09-02 23:30:04 +0000

    stand: remove CLANG_NO_IAS from cdboot
    
    Many components under stand/ had CLANG_NO_IAS added when Clang's
    Integrated Assembler (IAS) did not handle .codeNN directives.  Clang
    gained support quite some time ago, and we can now build stand/ with
    IAS.  In most cases IAS- and GNU as-assembled boot components were
    identical, and CLANG_NO_IAS was already removed from other components.
    
    Clang IAS produces different output for some components, including
    cdboot, so CLANG_NO_IAS was not previously removed for those.
    
    In the case of cdboot the difference is that IAS adds a size override
    prefix (67h) to many instructions to specify a 32-bit address, even
    though the two high bytes are zero.  This wastes three bytes per
    instance, but as cdboot is not size-constrained it doesn't matter.
    Padding is also different in one case; Clang used two one-byte nops
    while GNU as used a single two-byte xchg %eax, %eax.  In any case, there
    is no functional change.
    
    Sponsored by:   The FreeBSD Foundation
    
    (cherry picked from commit 1596e9a43cbfef904232a3321136e2ae480565f9)
---
 stand/i386/cdboot/Makefile | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/stand/i386/cdboot/Makefile b/stand/i386/cdboot/Makefile
index 093ec49ec77a..0598d5d80dce 100644
--- a/stand/i386/cdboot/Makefile
+++ b/stand/i386/cdboot/Makefile
@@ -14,6 +14,3 @@ ORG=	0x7c00
 LDFLAGS+=${LDFLAGS_BIN}
 
 .include <bsd.prog.mk>
-
-# XXX: clang integrated-as doesn't grok .codeNN directives yet
-CFLAGS.cdboot.S=	${CLANG_NO_IAS}