Author: emaste
Date: Thu Aug 15 17:32:39 2019
New Revision: 351092
URL: https://svnweb.freebsd.org/changeset/base/351092
Log:
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
Modified:
head/stand/i386/cdboot/Makefile
Modified: head/stand/i386/cdboot/Makefile
==============================================================================
--- head/stand/i386/cdboot/Makefile Thu Aug 15 17:31:11 2019
(r351091)
+++ head/stand/i386/cdboot/Makefile Thu Aug 15 17:32:39 2019
(r351092)
@@ -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}
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